Upload
inhenyeronerb
View
1.548
Download
8
Embed Size (px)
Citation preview
WIR
ES
& C
AB
LE
S:
WIR
ES
& C
AB
LE
S:
WIR
ES
& C
AB
LE
S:
WIR
ES
& C
AB
LE
S:
AP
PL
ICA
TIO
NS
ON
LO
W
AP
PL
ICA
TIO
NS
ON
LO
W
AP
PL
ICA
TIO
NS
ON
LO
W
AP
PL
ICA
TIO
NS
ON
LO
W
VO
LT
AG
E F
EE
DE
RS
&
VO
LT
AG
E F
EE
DE
RS
&
VO
LT
AG
E F
EE
DE
RS
&
VO
LT
AG
E F
EE
DE
RS
&
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
IIM
YT
HS
&F
AC
TS
INII
MY
TH
S&
FA
CT
SIN
IIM
YT
HS
&F
AC
TS
INII
MY
TH
S&
FA
CT
SIN
1
II: M
YT
HS
& F
AC
TS
IN
II: M
YT
HS
& F
AC
TS
IN
II: M
YT
HS
& F
AC
TS
IN
II: M
YT
HS
& F
AC
TS
IN
WIR
ES
& C
AB
LE
S W
IRE
S &
CA
BL
ES
WIR
ES
& C
AB
LE
S W
IRE
S &
CA
BL
ES
AP
PL
ICA
TIO
NA
PP
LIC
AT
ION
AP
PL
ICA
TIO
NA
PP
LIC
AT
ION
A T
YP
ICAL L
ARG
EA T
YP
ICAL L
ARG
EA T
YP
ICAL L
ARG
EA T
YP
ICAL L
ARG
ECO
RP
ORATE O
FFIC
E B
UIL
DIN
GCO
RP
ORATE O
FFIC
E B
UIL
DIN
GCO
RP
ORATE O
FFIC
E B
UIL
DIN
GCO
RP
ORATE O
FFIC
E B
UIL
DIN
G
MY
TH
S &
FA
CT
S M
YT
HS
& F
AC
TS
MY
TH
S &
FA
CT
S M
YT
HS
& F
AC
TS
MY
TH
S &
FA
CT
S M
YT
HS
& F
AC
TS
MY
TH
S &
FA
CT
S M
YT
HS
& F
AC
TS
INW
IRE
S&
INW
IRE
S&
INW
IRE
S&
INW
IRE
S&
INW
IRE
S&
INW
IRE
S&
INW
IRE
S&
INW
IRE
S&
22
IN W
IRE
S &
IN
WIR
ES
&
IN W
IRE
S &
IN
WIR
ES
&
IN W
IRE
S &
IN
WIR
ES
&
IN W
IRE
S &
IN
WIR
ES
&
CA
BL
ES
CA
BL
ES
CA
BL
ES
CA
BL
ES
CA
BL
ES
CA
BL
ES
CA
BL
ES
CA
BL
ES
AP
PL
ICA
TIO
NA
PP
LIC
AT
ION
AP
PL
ICA
TIO
NA
PP
LIC
AT
ION
AP
PL
ICA
TIO
NA
PP
LIC
AT
ION
AP
PL
ICA
TIO
NA
PP
LIC
AT
ION
THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) 60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed
MM
Siz
eA
ppro
xim
ate
AW
G S
ize
Am
paci
tyT
W60
deg
C
Am
paci
tyT
HW
75 d
eg C
Am
paci
tyT
HH
N90
deg
C
2.0
mm
214
1515
25
3.5
mm
212
2020
30
5.5
mm
210
3030
40
8.0
mm
28
4045
50
14m
m2
655
6570
33
14 m
m2
665
70
22 m
m2
470
8590
30 m
m2
290
110
115
38 m
m2
110
012
513
0
50 m
m2
1/0
120
145
150
60 m
m2
2/0
135
160
170
80 m
m2
3/0
160
195
205
100
mm
24/
018
522
025
5
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) 60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed60
0 V
OLTS
, S
trand
ed
MM
Siz
eA
ppro
xim
ate
AW
G S
ize
Am
paci
tyT
W60
deg
C
Am
paci
tyT
HW
75 d
eg C
Am
paci
tyT
HH
N90
deg
C
125
mm
225
0 M
CM
210
255
265
150
mm
230
0 M
CM
240
280
295
200
mm
240
0 M
CM
280
330
355
250
mm
250
0 M
CM
315
375
400
370
44
325
mm
265
0 M
CM
370
435
470
750
MC
M40
047
553
553
5
400
mm
280
0 M
CM
405
485
515
500
mm
210
00 M
CM
455
540
580
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
AM
PACIT
Y T
ABLE (Base
d o
n T
able
on A
VES
CO
pock
et b
ook)
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
Not m
ore
than 3
conduct
ors
in a
race
way o
r ca
ble
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
AM
PACIT
Y T
ABLE
(Lifte
d f
rom
(L
ifte
d f
rom
(L
ifte
d f
rom
(L
ifte
d f
rom
(L
ifte
d f
rom
(L
ifte
d f
rom
(L
ifte
d f
rom
(L
ifte
d f
rom
AV
ES
CO
pock
et
AV
ES
CO
pock
et
AV
ES
CO
pock
et
AV
ES
CO
pock
et
AV
ES
CO
pock
et
AV
ES
CO
pock
et
AV
ES
CO
pock
et
AV
ES
CO
pock
et
book)
book)
book)
book)
book)
book)
book)
book)
Note
: This
Table
is
Note
: This
Table
is
Note
: This
Table
is
Note
: This
Table
is
Note
: This
Table
is
Note
: This
Table
is
Note
: This
Table
is
Note
: This
Table
is
not qui
te iden
tica
l not qui
te iden
tica
l not qui
te iden
tica
l not qui
te iden
tica
l not qui
te iden
tica
l not qui
te iden
tica
l not qui
te iden
tica
l not qui
te iden
tica
l
55
with N
EC T
able
w
ith N
EC T
able
w
ith N
EC T
able
w
ith N
EC T
able
w
ith N
EC T
able
w
ith N
EC T
able
w
ith N
EC T
able
w
ith N
EC T
able
310
.16310
.16310
.16310
.16310
.16310
.16310
.16310
.16
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
BE C
AREFU
L IN
REFEREN
CIN
G
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
TABLES
ON
WIR
E &
CABLE
AM
PACIT
IES
.AM
PACIT
IES
.AM
PACIT
IES
.AM
PACIT
IES
.AM
PACIT
IES
.AM
PACIT
IES
.AM
PACIT
IES
.AM
PACIT
IES
.
66
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
BECAU
SE T
HEY A
RE N
OT A
CTU
ALLY
IDEN
TIC
AL…
IDEN
TIC
AL…
IDEN
TIC
AL…
IDEN
TIC
AL…
IDEN
TIC
AL…
IDEN
TIC
AL…
IDEN
TIC
AL…
IDEN
TIC
AL…
See
the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
S
ee the
diffe
renc
es o
n th
e ne
xt s
lide…
CO
MP
AR
ISO
N: N
OR
TH
AM
ER
ICA
N, P
HIL
IPP
INE
C
OM
PA
RIS
ON
: NO
RT
H A
ME
RIC
AN
, PH
ILIP
PIN
E
CO
MP
AR
ISO
N: N
OR
TH
AM
ER
ICA
N, P
HIL
IPP
INE
C
OM
PA
RIS
ON
: NO
RT
H A
ME
RIC
AN
, PH
ILIP
PIN
E
& E
UR
OP
EA
N M
AN
UF
AC
TU
RE
D C
AB
LE
S &
EU
RO
PE
AN
MA
NU
FA
CT
UR
ED
CA
BL
ES
& E
UR
OP
EA
N M
AN
UF
AC
TU
RE
D C
AB
LE
S &
EU
RO
PE
AN
MA
NU
FA
CT
UR
ED
CA
BL
ES
77
Jus
t cu
rious
…Jus
t cu
rious
…Jus
t cu
rious
…Jus
t cu
rious
…Jus
t cu
rious
…Jus
t cu
rious
…Jus
t cu
rious
…Jus
t cu
rious
…W
HIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
WHIC
H IS
THE M
ORE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE
EX
PEN
SIV
E W
IRE..? ..?..?..?..? ..?..?..?
88
TW
..?TW
..?TW
..?TW
..?TW
..?TW
..?TW
..?TW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
WHIC
H IS
THE S
UP
ERIO
R W
IRE?
TW
..?TW
..?TW
..?TW
..?TW
..?TW
..?TW
..?TW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THW
..?THHN
?THHN
?THHN
?THHN
?THHN
?THHN
?THHN
?THHN
?
99
THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?THHN
..?
Why
…?
Why
…?
Why
…?
Why
…?
Why
…?
Why
…?
Why
…?
Why
…?
DO
YO
U A
GREE T
HAT T
ODAY,
DO
YO
U A
GREE T
HAT T
ODAY,
DO
YO
U A
GREE T
HAT T
ODAY,
DO
YO
U A
GREE T
HAT T
ODAY, IN
IN
IN
IN
IN
IN
IN
IN
THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:THE P
HIL
IPP
INES
:
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
THE M
OS
T P
OP
ULAR B
UIL
DIN
G
WIR
ES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?W
IRES
ARE T
HE T
HHN
?
1010
WHY…?
WHY…?
WHY…?
WHY…?
WHY…?
WHY…?
WHY…?
WHY…?
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
How
do
we
size
aHow
do
we
size
aHow
do
we
size
aHow
do
we
size
aHow
do
we
size
aHow
do
we
size
aHow
do
we
size
aHow
do
we
size
a
1111
How
do w
e si
ze
a
How
do w
e si
ze
a
How
do w
e si
ze
a
How
do w
e si
ze
a
How
do w
e si
ze
a
How
do w
e si
ze
a
How
do w
e si
ze
a
How
do w
e si
ze
a
circ
uit…
?ci
rcui
t…?
circ
uit…
?ci
rcui
t…?
circ
uit…
?ci
rcui
t…?
circ
uit…
?ci
rcui
t…?
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
It’s
worthw
hile
rev
isitin
g the
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
basi
cs…
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
Let
’sTes
tO
urse
lves
1212
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
Let
s Tes
t O
urse
lves
w
ith
the
follo
win
g
with
the
follo
win
g
with
the
follo
win
g
with
the
follo
win
g
with
the
follo
win
g
with
the
follo
win
g
with
the
follo
win
g
with
the
follo
win
g
exer
cise
…ex
erci
se…
exer
cise
…ex
erci
se…
exer
cise
…ex
erci
se…
exer
cise
…ex
erci
se…
NEC
TA
BLE
3.1
6
Q: W
ha
t si
ze
Q: W
ha
t si
ze
Q: W
ha
t si
ze
Q: W
ha
t si
ze (
TW
, (T
W,
(TW
, (T
W,
TH
W,
TH
W,
TH
W,
TH
W,T
HH
N)
TH
HN
) T
HH
N)
TH
HN
) co
nd
uct
or
do
es
the
co
nd
uct
or
do
es
the
co
nd
uct
or
do
es
the
co
nd
uct
or
do
es
the
N
EC
re
qu
ire
fo
r a
N
EC
re
qu
ire
fo
r a
N
EC
re
qu
ire
fo
r a
N
EC
re
qu
ire
fo
r a
5
0A
cir
cuit
?5
0A
cir
cuit
?5
0A
cir
cuit
?5
0A
cir
cuit
?
a)
a)
a)
a)
#1
0#
10
#1
0#
10
1313
a)
a)
a)
a)
# 1
0#
10
# 1
0#
10
b)
b)
b)
b)
# 8
# 8
# 8
# 8
c) c)c)c)#
6#
6#
6#
6d
)d
)d
)d
)A
ny
of
the
se?
An
y o
f th
ese
?A
ny
of
the
se?
An
y o
f th
ese
?
No
te:
NEC
TA
BLE
3
.16
do
esn
’t h
ave
m
m s
izes.
NEC
TA
BLE
3.1
6
SOL
UT
ION
SOL
UT
ION
SOL
UT
ION
SOL
UT
ION
: :::
1)
1)
1)
1)
Ra
tin
g o
f C
ircu
it: 5
0 A
Ra
tin
g o
f C
ircu
it: 5
0 A
Ra
tin
g o
f C
ircu
it: 5
0 A
Ra
tin
g o
f C
ircu
it: 5
0 A
(Giv
en
)(G
ive
n)
(Giv
en
)(G
ive
n)
2)
Re
ferr
ing
to
th
e T
ab
le N
EC
2
) R
efe
rrin
g t
o t
he
Ta
ble
NE
C
2)
Re
ferr
ing
to
th
e T
ab
le N
EC
2
) R
efe
rrin
g t
o t
he
Ta
ble
NE
C
31
0.1
6:
31
0.1
6:
31
0.1
6:
31
0.1
6:
PR
OB
AB
LE
AN
SWE
RS:
PR
OB
AB
LE
AN
SWE
RS:
PR
OB
AB
LE
AN
SWE
RS:
PR
OB
AB
LE
AN
SWE
RS:
TE
ST C
ASE
TE
ST C
ASE
TE
ST C
ASE
TE
ST C
ASE
1414
�T
W: U
se, #
6 (
14
mm
2),
TW
: Use
, # 6
(1
4 m
m2
),T
W: U
se, #
6 (
14
mm
2),
TW
: Use
, # 6
(1
4 m
m2
),A
mp
aci
ty: 5
5A
Am
pa
city
: 55
AA
mp
aci
ty: 5
5A
Am
pa
city
: 55
A
�T
HW
: Use
, # 8
(8
.0 m
m2
),
TH
W: U
se, #
8 (
8.0
mm
2),
T
HW
: Use
, # 8
(8
.0 m
m2
),
TH
W: U
se, #
8 (
8.0
mm
2),
A
mp
aci
ty: 5
0A
Am
pa
city
: 50
AA
mp
aci
ty: 5
0A
Am
pa
city
: 50
A
�T
HH
N: U
se, #
8 (
8.0
mm
2),
TH
HN
: Use
, # 8
(8
.0 m
m2
),T
HH
N: U
se, #
8 (
8.0
mm
2),
TH
HN
: Use
, # 8
(8
.0 m
m2
),A
mp
aci
ty: 5
5A
Am
pa
city
: 55
AA
mp
aci
ty: 5
5A
Am
pa
city
: 55
A
WH
AT I
S
TH
E B
ES
T
1515
CH
OIC
E..
?
If y
ou
r an
swer
is:
#8
TH
W o
r
1616
#8
TH
HN
…
So
rry
Gu
ys,
1717
TH
AT I
S A
MY
TH
…!
SOL
UT
ION
SOL
UT
ION
SOL
UT
ION
SOL
UT
ION
: :::
Ra
tin
g o
f C
ircu
it: 5
0 A
Ra
tin
g o
f C
ircu
it: 5
0 A
Ra
tin
g o
f C
ircu
it: 5
0 A
Ra
tin
g o
f C
ircu
it: 5
0 A
(Giv
en
)(G
ive
n)
(Giv
en
)(G
ive
n)
TH
E C
OR
RE
CT
AN
SWE
RS
AR
E:
TH
E C
OR
RE
CT
AN
SWE
RS
AR
E:
TH
E C
OR
RE
CT
AN
SWE
RS
AR
E:
TH
E C
OR
RE
CT
AN
SWE
RS
AR
E:
�T
W:
TW
: T
W:
TW
: Use
, # 6
(1
4 m
m2
),U
se, #
6 (
14
mm
2),
Use
, # 6
(1
4 m
m2
),U
se, #
6 (
14
mm
2),
Am
pa
city
Am
pa
city
Am
pa
city
Am
pa
city
:55
A:5
5A
:55
A:5
5A
1818
Am
pa
city
Am
pa
city
Am
pa
city
Am
pa
city
: 55
A: 5
5A
: 55
A: 5
5A
�T
HW
: T
HW
: T
HW
: T
HW
: Use
, # 6
(1
4 m
m2
),
Use
, # 6
(1
4 m
m2
),
Use
, # 6
(1
4 m
m2
),
Use
, # 6
(1
4 m
m2
),
Am
pa
city
Am
pa
city
Am
pa
city
Am
pa
city
: 55
A @
60
de
g C
Co
lum
n: 5
5A
@ 6
0 d
eg
C C
olu
mn
: 55
A @
60
de
g C
Co
lum
n: 5
5A
@ 6
0 d
eg
C C
olu
mn
�T
HH
N:
TH
HN
: T
HH
N:
TH
HN
: Use
, # 6
(1
4 m
m2
),U
se, #
6 (
14
mm
2),
Use
, # 6
(1
4 m
m2
),U
se, #
6 (
14
mm
2),
Am
pa
city
Am
pa
city
Am
pa
city
Am
pa
city
: 55
A @
60
de
g C
Co
lum
n: 5
5A
@ 6
0 d
eg
C C
olu
mn
: 55
A @
60
de
g C
Co
lum
n: 5
5A
@ 6
0 d
eg
C C
olu
mn
HO
W C
OM
E..
?H
OW
CO
ME
..?
HO
W C
OM
E..
?H
OW
CO
ME
..?
LE
T U
S F
IRST
L
ET
US
FIR
ST
LE
T U
S F
IRST
L
ET
US
FIR
ST
1919
GO
BA
CK
TO
G
O B
AC
K T
O
GO
BA
CK
TO
G
O B
AC
K T
O
BA
SIC
S…B
ASI
CS…
BA
SIC
S…B
ASI
CS…
HO
W D
O W
E
HO
W D
O W
E
HO
W D
O W
E
HO
W D
O W
E
HO
W D
O W
E
HO
W D
O W
E
HO
W D
O W
E
HO
W D
O W
E
DES
IGN
A N
ON
DES
IGN
A N
ON
DES
IGN
A N
ON
DES
IGN
A N
ON
DES
IGN
A N
ON
DES
IGN
A N
ON
DES
IGN
A N
ON
DES
IGN
A N
ON
- ---- ---M
OTO
RBRAN
CH
MO
TO
RBRAN
CH
MO
TO
RBRAN
CH
MO
TO
RBRAN
CH
MO
TO
RBRAN
CH
MO
TO
RBRAN
CH
MO
TO
RBRAN
CH
MO
TO
RBRAN
CH 2020
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
MO
TO
R B
RAN
CH
CIR
CU
IT…?
CIR
CU
IT…?
CIR
CU
IT…?
CIR
CU
IT…?
CIR
CU
IT…?
CIR
CU
IT…?
CIR
CU
IT…?
CIR
CU
IT…?
A s
afe
ele
ctri
cal s
yst
em
sta
rts
fro
m t
he
ve
ry
A s
afe
ele
ctri
cal s
yst
em
sta
rts
fro
m t
he
ve
ry
ba
sic
wir
ing
fu
nd
am
en
tals
b
asi
c w
irin
g f
un
da
me
nta
ls ––
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
the
bra
nch
cir
cuit
. . . . . . . .
In g
en
era
l te
rms,
a b
ran
ch c
ircu
it c
ou
ld e
ith
er
In g
en
era
l te
rms,
a b
ran
ch c
ircu
it c
ou
ld e
ith
er
be
b
e n
on
no
n--m
oto
rm
oto
r(a
s in
lig
hti
ng
, rec
epta
cle
ou
tlet
s,
(as
in li
gh
tin
g, r
ecep
tacl
e o
utl
ets,
&
)&
)l
dd
ii
ld
di
i
2121
& c
om
pu
ters
)&
co
mp
ute
rs)
or
or
mo
tor
loa
de
d c
ircu
it.
mo
tor
loa
de
d c
ircu
it.
A
A
A
A
A
A
A
A b
ran
ch c
ircu
itb
ran
ch c
ircu
itb
ran
ch c
ircu
itb
ran
ch c
ircu
itb
ran
ch c
ircu
itb
ran
ch c
ircu
itb
ran
ch c
ircu
itb
ran
ch c
ircu
itis
th
at p
art
of
a w
irin
g s
yste
m
is t
hat
par
t o
f a
wir
ing
sys
tem
is
th
at p
art
of
a w
irin
g s
yste
m
is t
hat
par
t o
f a
wir
ing
sys
tem
is
th
at p
art
of
a w
irin
g s
yste
m
is t
hat
par
t o
f a
wir
ing
sys
tem
is
th
at p
art
of
a w
irin
g s
yste
m
is t
hat
par
t o
f a
wir
ing
sys
tem
ex
ten
din
g b
eyo
nd
th
e la
st o
r fi
nal
pro
tect
ive
exte
nd
ing
bey
on
d t
he
last
or
fin
al p
rote
ctiv
e ex
ten
din
g b
eyo
nd
th
e la
st o
r fi
nal
pro
tect
ive
exte
nd
ing
bey
on
d t
he
last
or
fin
al p
rote
ctiv
e ex
ten
din
g b
eyo
nd
th
e la
st o
r fi
nal
pro
tect
ive
exte
nd
ing
bey
on
d t
he
last
or
fin
al p
rote
ctiv
e ex
ten
din
g b
eyo
nd
th
e la
st o
r fi
nal
pro
tect
ive
exte
nd
ing
bey
on
d t
he
last
or
fin
al p
rote
ctiv
e d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.d
evic
e to
th
e lo
ad it
sp
ecif
ical
ly s
erve
s.
Th
e b
ran
ch c
ircu
it r
ep
rese
nts
th
e la
st s
tep
in t
he
T
he
bra
nch
cir
cuit
re
pre
sen
ts t
he
last
ste
p in
th
e
tra
nsf
er
of
po
we
r fr
om
th
e s
erv
ice
or
sou
rce
of
tra
nsf
er
of
po
we
r fr
om
th
e s
erv
ice
or
sou
rce
of
en
erg
y t
o u
tili
zati
on
de
vic
es.
e
ne
rgy
to
uti
liza
tio
n d
ev
ice
s.
A b
ran
ch c
ircu
it m
ay
ha
ve
se
ve
ral l
igh
tin
g o
r A
bra
nch
cir
cuit
ma
y h
av
e s
ev
era
l lig
hti
ng
or
rece
pta
cle
ou
tle
ts c
on
ne
cte
d t
o it
as
a c
ircu
it o
r m
ay
re
cep
tacl
e o
utl
ets
co
nn
ect
ed
to
it a
s a
cir
cuit
or
ma
y 2222
serv
e a
sin
gle
loa
d a
s in
mo
tor
or
he
av
y a
pp
lia
nce
. se
rve
a s
ing
le lo
ad
as
in m
oto
r o
r h
ea
vy
ap
pli
an
ce.
A b
ran
ch c
ircu
it w
ill q
ua
lify
as
such
wh
en
it h
as
a
A b
ran
ch c
ircu
it w
ill q
ua
lify
as
such
wh
en
it h
as
a
pro
tect
ive
dev
ice
pro
tect
ive
dev
ice
fro
m t
he
po
int
of
tap
pin
g.
fro
m t
he
po
int
of
tap
pin
g.
Th
ere
fore
, th
e b
ran
ch c
ircu
it is
ma
de
up
of
:T
he
refo
re, t
he
bra
nch
cir
cuit
is m
ad
e u
p o
f :
1)
1)
Th
e O
ve
rT
he
Ov
er--
Cu
rre
nt
Pro
tect
ive
De
vic
e (
OC
PD
)C
urr
en
t P
rote
ctiv
e D
ev
ice
(O
CP
D) 2323
))(
)(
)2
)2
)T
he
Co
nd
uct
or
(Wir
e o
r C
ab
le)
Th
e C
on
du
cto
r (W
ire
or
Ca
ble
)3
)3
)T
he
Lo
ad
(M
oto
r o
r N
on
Th
e L
oa
d (
Mo
tor
or
No
n--M
oto
r L
oa
ds)
Mo
tor
Lo
ad
s)
QU
EST
ION
S:Q
UE
STIO
NS:
QU
EST
ION
S:Q
UE
STIO
NS:
QU
EST
ION
S:Q
UE
STIO
NS:
QU
EST
ION
S:Q
UE
STIO
NS:
��F
rom
wh
ere
sh
all
we
ba
se o
ur
loa
ds?
Fro
m w
he
re s
ha
ll w
e b
ase
ou
r lo
ad
s?
2424
��F
rom
wh
ere
sh
all
we
ba
se o
ur
sizi
ng
of
Fro
m w
he
re s
ha
ll w
e b
ase
ou
r si
zin
g o
f co
nd
uct
ors
?co
nd
uct
ors
?
��F
rom
wh
ere
sh
all
we
ba
se o
ur
OC
PD
?F
rom
wh
ere
sh
all
we
ba
se o
ur
OC
PD
?
2525
2626
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
Th
itf
bh
iit
Th
itf
bh
iit
Th
itf
bh
iit
Th
itf
bh
iit
Th
itf
bh
iit
Th
itf
bh
iit
Th
itf
bh
iit
Th
itf
bh
iit
2727
��T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
T
he
am
pa
city
of
bra
nch
cir
cuit
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
m
ax
imu
m lo
ad
to
be
se
rve
d.
ma
xim
um
loa
d t
o b
e s
erv
ed
. m
ax
imu
m lo
ad
to
be
se
rve
d.
ma
xim
um
loa
d t
o b
e s
erv
ed
. m
ax
imu
m lo
ad
to
be
se
rve
d.
ma
xim
um
loa
d t
o b
e s
erv
ed
. m
ax
imu
m lo
ad
to
be
se
rve
d.
ma
xim
um
loa
d t
o b
e s
erv
ed
. (N
EC
(N
EC
(N
EC
(N
EC
(N
EC
(N
EC
(N
EC
(N
EC
Se
ctio
n 2
10
Sect
ion
21
0Se
ctio
n 2
10
Sect
ion
21
0Se
ctio
n 2
10
Sect
ion
21
0Se
ctio
n 2
10
Sect
ion
21
0- ---- ---1
9a
).1
9a
).1
9a
).1
9a
).1
9a
).1
9a
).1
9a
).1
9a
).
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
��T
he
rati
ng
of
ab
ran
chci
rcu
itis
Th
era
tin
go
fa
bra
nch
circ
uit
isT
he
rati
ng
of
ab
ran
chci
rcu
itis
Th
era
tin
go
fa
bra
nch
circ
uit
isT
he
rati
ng
of
ab
ran
chci
rcu
itis
Th
era
tin
go
fa
bra
nch
circ
uit
isT
he
rati
ng
of
ab
ran
chci
rcu
itis
Th
era
tin
go
fa
bra
nch
circ
uit
is��
Th
e r
ati
ng
of
a b
ran
ch c
ircu
it is
T
he
ra
tin
g o
f a
bra
nch
cir
cuit
is
Th
e r
ati
ng
of
a b
ran
ch c
ircu
it is
T
he
ra
tin
g o
f a
bra
nch
cir
cuit
is
Th
e r
ati
ng
of
a b
ran
ch c
ircu
it is
T
he
ra
tin
g o
f a
bra
nch
cir
cuit
is
Th
e r
ati
ng
of
a b
ran
ch c
ircu
it is
T
he
ra
tin
g o
f a
bra
nch
cir
cuit
is
est
ab
lish
ed
or
de
fin
ed
by
th
e r
ati
ng
e
sta
bli
she
d o
r d
efi
ne
d b
y t
he
ra
tin
g
est
ab
lish
ed
or
de
fin
ed
by
th
e r
ati
ng
e
sta
bli
she
d o
r d
efi
ne
d b
y t
he
ra
tin
g
est
ab
lish
ed
or
de
fin
ed
by
th
e r
ati
ng
e
sta
bli
she
d o
r d
efi
ne
d b
y t
he
ra
tin
g
est
ab
lish
ed
or
de
fin
ed
by
th
e r
ati
ng
e
sta
bli
she
d o
r d
efi
ne
d b
y t
he
ra
tin
g
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
or
sett
ing
of
its
pro
tect
ive
de
vic
e.
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
- ---- ---3).
3).
3).
3).
3).
3).
3).
3).
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
��T
he
am
pa
city
of
bra
nch
circ
uit
Th
ea
mp
aci
tyo
fb
ran
chci
rcu
itT
he
am
pa
city
of
bra
nch
circ
uit
Th
ea
mp
aci
tyo
fb
ran
chci
rcu
itT
he
am
pa
city
of
bra
nch
circ
uit
Th
ea
mp
aci
tyo
fb
ran
chci
rcu
itT
he
am
pa
city
of
bra
nch
circ
uit
Th
ea
mp
aci
tyo
fb
ran
chci
rcu
it��
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
Th
e a
mp
aci
ty o
f b
ran
ch c
ircu
it
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
con
du
cto
rs m
ust
no
t b
e le
ss t
ha
n t
he
co
nd
uct
ors
mu
st n
ot
be
less
th
an
th
e
rati
ng
of
the
bra
nch
cir
cuit
. ra
tin
g o
f th
e b
ran
ch c
ircu
it.
rati
ng
of
the
bra
nch
cir
cuit
. ra
tin
g o
f th
e b
ran
ch c
ircu
it.
rati
ng
of
the
bra
nch
cir
cuit
. ra
tin
g o
f th
e b
ran
ch c
ircu
it.
rati
ng
of
the
bra
nch
cir
cuit
. ra
tin
g o
f th
e b
ran
ch c
ircu
it. (
NE
C
(NE
C
(NE
C
(NE
C
(NE
C
(NE
C
(NE
C
(NE
C
Sect
ion
21
0Se
ctio
n 2
10
Sect
ion
21
0Se
ctio
n 2
10
Sect
ion
21
0Se
ctio
n 2
10
Sect
ion
21
0Se
ctio
n 2
10
- ---- ---19
a).
19
a).
19
a).
19
a).
19
a).
19
a).
19
a).
19
a).
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
Cir
cuit
co
nd
uct
ors
sh
all
be
pro
tect
ed
ag
ain
st o
ve
rC
ircu
it c
on
du
cto
rs s
ha
ll b
e p
rote
cte
d a
ga
inst
ov
er
Cir
cuit
co
nd
uct
ors
sh
all
be
pro
tect
ed
ag
ain
st o
ve
rC
ircu
it c
on
du
cto
rs s
ha
ll b
e p
rote
cte
d a
ga
inst
ov
er
Cir
cuit
co
nd
uct
ors
sh
all
be
pro
tect
ed
ag
ain
st o
ve
rC
ircu
it c
on
du
cto
rs s
ha
ll b
e p
rote
cte
d a
ga
inst
ov
er
Cir
cuit
co
nd
uct
ors
sh
all
be
pro
tect
ed
ag
ain
st o
ve
rC
ircu
it c
on
du
cto
rs s
ha
ll b
e p
rote
cte
d a
ga
inst
ov
er- ---- ---
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir
curr
en
t in
acc
ord
an
ce t
o t
he
ir a
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
s, , b
ut
wh
ere
b
ut
wh
ere
th
e
the
am
pa
city
am
pa
city
of
the
co
nd
uct
or
do
es
no
t co
rre
spo
nd
o
f th
e c
on
du
cto
r d
oe
s n
ot
corr
esp
on
d
wit
h t
he
sta
nd
ard
am
pe
re r
ati
ng
of
a f
use
or
a c
ircu
it
wit
h t
he
sta
nd
ard
am
pe
re r
ati
ng
of
a f
use
or
a c
ircu
it
bre
ak
er ,
b
rea
ke
r, t
he
ne
xt
hig
he
r ra
tin
g s
ha
ll b
e p
erm
itte
d
the
ne
xt
hig
he
r ra
tin
g s
ha
ll b
e p
erm
itte
d
,,g
gp
gg
po
nly
if t
his
ra
tin
g d
oe
s n
ot
ex
cee
d 8
00
am
pe
res
on
ly if
th
is r
ati
ng
do
es
no
t e
xce
ed
80
0 a
mp
ere
s. (
NE
C
. (N
EC
Se
ctio
n 2
40
Sect
ion
24
0--3
).
3).
TH
IS M
EA
NS
A M
AN
DA
TO
RY
MA
TC
H B
ET
WE
EN
TH
E
TH
IS M
EA
NS
A M
AN
DA
TO
RY
MA
TC
H B
ET
WE
EN
TH
E
CO
ND
UC
TO
R A
MP
AC
ITY
WIT
H I
TS
OC
PD
(O
VE
RC
ON
DU
CT
OR
AM
PA
CIT
Y W
ITH
IT
S O
CP
D (
OV
ER
--C
UR
RE
NT
PR
OT
EC
TIV
E D
EV
ICE
).C
UR
RE
NT
PR
OT
EC
TIV
E D
EV
ICE
).
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
Th
e m
ax
imu
m c
on
tin
uo
us
loa
d t
ha
t T
he
ma
xim
um
co
nti
nu
ou
s lo
ad
th
at
Th
e m
ax
imu
m c
on
tin
uo
us
loa
d t
ha
t T
he
ma
xim
um
co
nti
nu
ou
s lo
ad
th
at
Th
e m
ax
imu
m c
on
tin
uo
us
loa
d t
ha
t T
he
ma
xim
um
co
nti
nu
ou
s lo
ad
th
at
Th
e m
ax
imu
m c
on
tin
uo
us
loa
d t
ha
t T
he
ma
xim
um
co
nti
nu
ou
s lo
ad
th
at 3131
can
be
se
rve
d b
y t
he
bra
nch
cir
cuit
ca
n b
e s
erv
ed
by
th
e b
ran
ch c
ircu
it
can
be
se
rve
d b
y t
he
bra
nch
cir
cuit
ca
n b
e s
erv
ed
by
th
e b
ran
ch c
ircu
it
can
be
se
rve
d b
y t
he
bra
nch
cir
cuit
ca
n b
e s
erv
ed
by
th
e b
ran
ch c
ircu
it
can
be
se
rve
d b
y t
he
bra
nch
cir
cuit
ca
n b
e s
erv
ed
by
th
e b
ran
ch c
ircu
it
con
du
cto
rs m
ust
no
t b
e m
ore
th
an
co
nd
uct
ors
mu
st n
ot
be
mo
re t
ha
n
con
du
cto
rs m
ust
no
t b
e m
ore
th
an
co
nd
uct
ors
mu
st n
ot
be
mo
re t
ha
n
con
du
cto
rs m
ust
no
t b
e m
ore
th
an
co
nd
uct
ors
mu
st n
ot
be
mo
re t
ha
n
con
du
cto
rs m
ust
no
t b
e m
ore
th
an
co
nd
uct
ors
mu
st n
ot
be
mo
re t
ha
n
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
80
% o
f th
e a
mp
aci
ty o
f th
e
con
du
cto
rs.
con
du
cto
rs.
con
du
cto
rs.
con
du
cto
rs.
con
du
cto
rs.
con
du
cto
rs.
con
du
cto
rs.
con
du
cto
rs. (
NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
(NE
C S
ect
ion
21
0(N
EC
Se
ctio
n 2
10
- ---- ---19
a).
19
a).
19
a).
19
a).
19
a).
19
a).
19
a).
19
a).
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
��T
he
cu
rre
nt
pe
rmit
ted
to
be
ca
rrie
d b
y
Th
e c
urr
en
t p
erm
itte
d t
o b
e c
arr
ied
by
T
he
cu
rre
nt
pe
rmit
ted
to
be
ca
rrie
d b
y
Th
e c
urr
en
t p
erm
itte
d t
o b
e c
arr
ied
by
T
he
cu
rre
nt
pe
rmit
ted
to
be
ca
rrie
d b
y
Th
e c
urr
en
t p
erm
itte
d t
o b
e c
arr
ied
by
T
he
cu
rre
nt
pe
rmit
ted
to
be
ca
rrie
d b
y
Th
e c
urr
en
t p
erm
itte
d t
o b
e c
arr
ied
by
th
e b
ran
ch c
ircu
it c
on
du
cto
rs h
as
to b
e
the
bra
nch
cir
cuit
co
nd
uct
ors
ha
s to
be
th
e b
ran
ch c
ircu
it c
on
du
cto
rs h
as
to b
e
the
bra
nch
cir
cuit
co
nd
uct
ors
ha
s to
be
th
e b
ran
ch c
ircu
it c
on
du
cto
rs h
as
to b
e
the
bra
nch
cir
cuit
co
nd
uct
ors
ha
s to
be
th
e b
ran
ch c
ircu
it c
on
du
cto
rs h
as
to b
e
the
bra
nch
cir
cuit
co
nd
uct
ors
ha
s to
be
3232
80
% if
th
e lo
ad
is c
on
tin
uo
us.
Th
is r
ule
8
0%
if t
he
loa
d is
co
nti
nu
ou
s. T
his
ru
le
80
% if
th
e lo
ad
is c
on
tin
uo
us.
Th
is r
ule
8
0%
if t
he
loa
d is
co
nti
nu
ou
s. T
his
ru
le
80
% if
th
e lo
ad
is c
on
tin
uo
us.
Th
is r
ule
8
0%
if t
he
loa
d is
co
nti
nu
ou
s. T
his
ru
le
80
% if
th
e lo
ad
is c
on
tin
uo
us.
Th
is r
ule
8
0%
if t
he
loa
d is
co
nti
nu
ou
s. T
his
ru
le
refe
rs t
o a
lim
it o
f th
e lo
ad
to
be
re
fers
to
a li
mit
of
the
loa
d t
o b
e
refe
rs t
o a
lim
it o
f th
e lo
ad
to
be
re
fers
to
a li
mit
of
the
loa
d t
o b
e
refe
rs t
o a
lim
it o
f th
e lo
ad
to
be
re
fers
to
a li
mit
of
the
loa
d t
o b
e
refe
rs t
o a
lim
it o
f th
e lo
ad
to
be
re
fers
to
a li
mit
of
the
loa
d t
o b
e
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs.
carr
ied
by
th
e c
on
du
cto
rs. (
NE
C 2
10
(NE
C 2
10
(NE
C 2
10
(NE
C 2
10
(NE
C 2
10
(NE
C 2
10
(NE
C 2
10
(NE
C 2
10
- ---- ---2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
Co
nti
nu
ou
s lo
ad
re
fers
to
a lo
ad
th
at
op
era
tes
Co
nti
nu
ou
s lo
ad
re
fers
to
a lo
ad
th
at
op
era
tes
Co
nti
nu
ou
s lo
ad
re
fers
to
a lo
ad
th
at
op
era
tes
Co
nti
nu
ou
s lo
ad
re
fers
to
a lo
ad
th
at
op
era
tes
for
for
for
for
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
thre
e (
3)
ho
urs
or
mo
re, s
uch
as
sto
re
or
mo
re, s
uch
as
sto
re
or
mo
re, s
uch
as
sto
re
or
mo
re, s
uch
as
sto
re
lig
hti
ng
, off
ice
lig
hti
ng
an
d s
imil
ar
loa
ds.
li
gh
tin
g, o
ffic
e li
gh
tin
g a
nd
sim
ila
r lo
ad
s.
lig
hti
ng
, off
ice
lig
hti
ng
an
d s
imil
ar
loa
ds.
li
gh
tin
g, o
ffic
e li
gh
tin
g a
nd
sim
ila
r lo
ad
s. 3333
Th
is r
ule
lim
its
the
loa
d o
n t
he
cir
cuit
T
his
ru
le li
mit
s th
e lo
ad
on
th
e c
ircu
it
Th
is r
ule
lim
its
the
loa
d o
n t
he
cir
cuit
T
his
ru
le li
mit
s th
e lo
ad
on
th
e c
ircu
it
con
du
cto
rs; i
t d
oe
s n
ot
cha
ng
e t
he
co
nd
uct
ors
; it
do
es
no
t ch
an
ge
th
e
con
du
cto
rs; i
t d
oe
s n
ot
cha
ng
e t
he
co
nd
uct
ors
; it
do
es
no
t ch
an
ge
th
e a
mp
aci
tya
mp
aci
tya
mp
aci
tya
mp
aci
tyo
f th
e c
ircu
it c
on
du
cto
rs o
r th
e r
ati
ng
or
of
the
cir
cuit
co
nd
uct
ors
or
the
ra
tin
g o
r o
f th
e c
ircu
it c
on
du
cto
rs o
r th
e r
ati
ng
or
of
the
cir
cuit
co
nd
uct
ors
or
the
ra
tin
g o
r se
ttin
g o
f th
e c
ircu
it o
ve
rse
ttin
g o
f th
e c
ircu
it o
ve
rse
ttin
g o
f th
e c
ircu
it o
ve
rse
ttin
g o
f th
e c
ircu
it o
ve
r- ---cu
rre
nt
pro
tect
ive
cu
rre
nt
pro
tect
ive
cu
rre
nt
pro
tect
ive
cu
rre
nt
pro
tect
ive
d
ev
ice
. d
ev
ice
. d
ev
ice
. d
ev
ice
. (N
EC
21
0(N
EC
21
0(N
EC
21
0(N
EC
21
0(N
EC
21
0(N
EC
21
0(N
EC
21
0(N
EC
21
0- ---- ---2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.2
2c)
.
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
Th
e
Th
e t
ota
l lo
ad
on
an
y o
ve
rto
tal l
oa
d o
n a
ny
ov
er
tota
l lo
ad
on
an
y o
ve
rto
tal l
oa
d o
n a
ny
ov
er
tota
l lo
ad
on
an
y o
ve
rto
tal l
oa
d o
n a
ny
ov
er
tota
l lo
ad
on
an
y o
ve
rto
tal l
oa
d o
n a
ny
ov
er- ---- ---
curr
en
t cu
rre
nt
curr
en
t cu
rre
nt
curr
en
t cu
rre
nt
curr
en
t cu
rre
nt
de
vic
e in
a
de
vic
e in
a
de
vic
e in
a
de
vic
e in
a
de
vic
e in
a
de
vic
e in
a
de
vic
e in
a
de
vic
e in
a p
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdm
ust
no
t m
ust
no
t m
ust
no
t m
ust
no
t m
ust
no
t m
ust
no
t m
ust
no
t m
ust
no
t e
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
ee
xce
ed
80
%o
fth
era
tin
go
fth
e
3434
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ex
cee
d 8
0%
of
the
ra
tin
g o
f th
e
ov
er
ov
er
ov
er
ov
er
ov
er
ov
er
ov
er
ov
er- ---- ---
curr
en
t d
ev
ice
curr
en
t d
ev
ice
curr
en
t d
ev
ice
curr
en
t d
ev
ice
curr
en
t d
ev
ice
curr
en
t d
ev
ice
curr
en
t d
ev
ice
curr
en
t d
ev
ice
. .... ...(N
EC
Sec
tio
n
(NE
C S
ecti
on
3
84
38
4--1
6c)
. 1
6c)
.
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
SW
IRIN
G F
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
SOM
E E
XE
RC
ISE
S…SO
ME
EX
ER
CIS
ES…
3535
3636
3737
3838
3939
4040
4141
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
AR
E T
HE
CIR
CU
ITS
DIS
CU
SSE
D I
N
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
PR
EC
ED
ING
EX
AM
PL
ES
4242
AL
RE
AD
Y S
AF
E F
RO
M F
IRE
A
LR
EA
DY
SA
FE
FR
OM
FIR
E
AL
RE
AD
Y S
AF
E F
RO
M F
IRE
A
LR
EA
DY
SA
FE
FR
OM
FIR
E
AL
RE
AD
Y S
AF
E F
RO
M F
IRE
A
LR
EA
DY
SA
FE
FR
OM
FIR
E
AL
RE
AD
Y S
AF
E F
RO
M F
IRE
A
LR
EA
DY
SA
FE
FR
OM
FIR
E
HA
ZA
RD
S…?
HA
ZA
RD
S…?
HA
ZA
RD
S…?
HA
ZA
RD
S…?
HA
ZA
RD
S…?
HA
ZA
RD
S…?
HA
ZA
RD
S…?
HA
ZA
RD
S…?
NO
T Q
UIT
E…
!N
OT
QU
ITE
…!
NO
T Q
UIT
E…
!N
OT
QU
ITE
…!
NO
T Q
UIT
E…
!N
OT
QU
ITE
…!
NO
T Q
UIT
E…
!N
OT
QU
ITE
…!
4343
be
cau
se…
be
cau
se…
be
cau
se…
be
cau
se…
be
cau
se…
be
cau
se…
be
cau
se…
be
cau
se…
Th
ere
is t
he
so
Th
ere
is t
he
so
Th
ere
is t
he
so
Th
ere
is t
he
so
Th
ere
is t
he
so
Th
ere
is t
he
so
Th
ere
is t
he
so
Th
ere
is t
he
so
- ---- ---ca
lle
d
call
ed
ca
lle
d
call
ed
ca
lle
d
call
ed
ca
lle
d
call
ed
D
ER
AT
ING
&C
OR
RE
CT
ION
DE
RA
TIN
G&
CO
RR
EC
TIO
ND
ER
AT
ING
&C
OR
RE
CT
ION
DE
RA
TIN
G&
CO
RR
EC
TIO
ND
ER
AT
ING
&C
OR
RE
CT
ION
DE
RA
TIN
G&
CO
RR
EC
TIO
ND
ER
AT
ING
&C
OR
RE
CT
ION
DE
RA
TIN
G&
CO
RR
EC
TIO
N 4444
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
DE
RA
TIN
G &
CO
RR
EC
TIO
N
FA
CT
OR
SF
AC
TO
RS
FA
CT
OR
SF
AC
TO
RS
FA
CT
OR
SF
AC
TO
RS
FA
CT
OR
SF
AC
TO
RS
No
te t
ha
t th
e
No
te t
ha
t th
e
No
te t
ha
t th
e
No
te t
ha
t th
e
No
te t
ha
t th
e
No
te t
ha
t th
e
No
te t
ha
t th
e
No
te t
ha
t th
e D
era
tin
gD
era
tin
gD
era
tin
gD
era
tin
gD
era
tin
gD
era
tin
gD
era
tin
gD
era
tin
g&
&
&
&
&
&
&
&
C
orr
ect
ion
Fa
cto
rs
Co
rre
ctio
n F
act
ors
C
orr
ect
ion
Fa
cto
rs
Co
rre
ctio
n F
act
ors
C
orr
ect
ion
Fa
cto
rs
Co
rre
ctio
n F
act
ors
C
orr
ect
ion
Fa
cto
rs
Co
rre
ctio
n F
act
ors
Ca
use
to
C
au
se t
o
Ca
use
to
C
au
se t
o
Ca
use
to
C
au
se t
o
Ca
use
to
C
au
se t
o
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
Ch
an
ge
th
e C
UR
RE
NT
- ---- ---
4545
CA
RR
YIN
G C
AP
AC
ITY
OF
C
AR
RY
ING
CA
PA
CIT
Y O
F
CA
RR
YIN
G C
AP
AC
ITY
OF
C
AR
RY
ING
CA
PA
CIT
Y O
F
CA
RR
YIN
G C
AP
AC
ITY
OF
C
AR
RY
ING
CA
PA
CIT
Y O
F
CA
RR
YIN
G C
AP
AC
ITY
OF
C
AR
RY
ING
CA
PA
CIT
Y O
F
TH
E C
ON
DU
CT
OR
S!T
HE
CO
ND
UC
TO
RS!
TH
E C
ON
DU
CT
OR
S!T
HE
CO
ND
UC
TO
RS!
TH
E C
ON
DU
CT
OR
S!T
HE
CO
ND
UC
TO
RS!
TH
E C
ON
DU
CT
OR
S!T
HE
CO
ND
UC
TO
RS!
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––– –––W
IRIN
G
WIR
ING
W
IRIN
G
WIR
ING
W
IRIN
G
WIR
ING
W
IRIN
G
WIR
ING
F
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
S
��T
he
no
rma
l ma
xim
um
am
pa
citi
es
of
Th
e n
orm
al m
ax
imu
m a
mp
aci
tie
s o
f T
he
no
rma
l ma
xim
um
am
pa
citi
es
of
Th
e n
orm
al m
ax
imu
m a
mp
aci
tie
s o
f T
he
no
rma
l ma
xim
um
am
pa
citi
es
of
Th
e n
orm
al m
ax
imu
m a
mp
aci
tie
s o
f T
he
no
rma
l ma
xim
um
am
pa
citi
es
of
Th
e n
orm
al m
ax
imu
m a
mp
aci
tie
s o
f co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
co
nd
uct
ors
in c
ab
les
or
race
wa
ys
are
g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0g
ive
nin
NE
CT
ab
les
31
0- ---- ---1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n1
6(c
op
pe
r)o
n 4646
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
giv
en
in N
EC
Ta
ble
s 3
10
16
(co
pp
er)
on
1
6 (
cop
pe
r) o
n
16
(co
pp
er)
on
1
6 (
cop
pe
r) o
n
16
(co
pp
er)
on
1
6 (
cop
pe
r) o
n
16
(co
pp
er)
on
1
6 (
cop
pe
r) o
n
a 3
0 d
eg
C a
mb
ien
t te
mp
era
ture
. a
30
de
g C
am
bie
nt
tem
pe
ratu
re.
a 3
0 d
eg
C a
mb
ien
t te
mp
era
ture
. a
30
de
g C
am
bie
nt
tem
pe
ratu
re.
a 3
0 d
eg
C a
mb
ien
t te
mp
era
ture
. a
30
de
g C
am
bie
nt
tem
pe
ratu
re.
a 3
0 d
eg
C a
mb
ien
t te
mp
era
ture
. a
30
de
g C
am
bie
nt
tem
pe
ratu
re.
��F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r F
or
am
bie
nt
tem
pe
ratu
res
un
de
r o
r o
ve
r 3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
3
0 d
eg
C, C
orr
ect
ion
Fa
cto
rs m
ust
be
co
nsi
de
red
. co
nsi
de
red
. co
nsi
de
red
. co
nsi
de
red
. co
nsi
de
red
. co
nsi
de
red
. co
nsi
de
red
. co
nsi
de
red
.
4747
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
BR
AN
CH
CIR
CU
ITS
– –––W
IRIN
G
WIR
ING
W
IRIN
G
WIR
ING
F
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
SF
UN
DA
ME
NT
AL
S
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
RE
LE
VA
NT
CO
DE
RE
QU
IRE
ME
NT
SR
EL
EV
AN
T C
OD
E R
EQ
UIR
EM
EN
TS
�T
he
se n
orm
al a
mp
aci
tie
s m
ay
ha
ve
to
T
he
se n
orm
al a
mp
aci
tie
s m
ay
ha
ve
to
T
he
se n
orm
al a
mp
aci
tie
s m
ay
ha
ve
to
T
he
se n
orm
al a
mp
aci
tie
s m
ay
ha
ve
to
b
e d
era
ted
wh
ere
th
ere
are
mo
re t
ha
n
be
de
rate
d w
he
re t
he
re a
re m
ore
th
an
b
e d
era
ted
wh
ere
th
ere
are
mo
re t
ha
n
be
de
rate
d w
he
re t
he
re a
re m
ore
th
an
th
dt
ib
lth
dt
ib
lth
dt
ib
lth
dt
ib
l
4848
thre
e c
on
du
cto
rs in
a c
ab
le o
r ra
cew
ay
th
ree
co
nd
uct
ors
in a
ca
ble
or
race
wa
y
thre
e c
on
du
cto
rs in
a c
ab
le o
r ra
cew
ay
th
ree
co
nd
uct
ors
in a
ca
ble
or
race
wa
y
(No
te 8
to
Tab
les
31
0(N
ote
8 t
o T
able
s 3
10
(No
te 8
to
Tab
les
31
0(N
ote
8 t
o T
able
s 3
10
- ---16
th
rou
gh
31
01
6 t
hro
ug
h 3
10
16
th
rou
gh
31
01
6 t
hro
ug
h 3
10
- ---1
9).
19
).1
9).
19
).
�T
his
me
an
s a
ch
an
ge
in a
mp
aci
tie
s o
f T
his
me
an
s a
ch
an
ge
in a
mp
aci
tie
s o
f T
his
me
an
s a
ch
an
ge
in a
mp
aci
tie
s o
f T
his
me
an
s a
ch
an
ge
in a
mp
aci
tie
s o
f ci
rcu
it c
on
du
cto
rs.
circ
uit
co
nd
uct
ors
.ci
rcu
it c
on
du
cto
rs.
circ
uit
co
nd
uct
ors
.
TH
US
TH
ER
E A
RE
TW
O T
HIN
GS
TO
T
HU
S T
HE
RE
AR
E T
WO
TH
ING
S T
O
TH
US
TH
ER
E A
RE
TW
O T
HIN
GS
TO
T
HU
S T
HE
RE
AR
E T
WO
TH
ING
S T
O
CO
NSI
DE
R T
HA
T R
ED
UC
E C
ON
DU
CT
OR
C
ON
SID
ER
TH
AT
RE
DU
CE
CO
ND
UC
TO
R
CO
NSI
DE
R T
HA
T R
ED
UC
E C
ON
DU
CT
OR
C
ON
SID
ER
TH
AT
RE
DU
CE
CO
ND
UC
TO
R
AM
PA
CIT
IES…
AM
PA
CIT
IES…
AM
PA
CIT
IES…
AM
PA
CIT
IES…
TH
ESE
AR
E T
HE
FO
LL
OW
ING
:T
HE
SE A
RE
TH
E F
OL
LO
WIN
G:
TH
ESE
AR
E T
HE
FO
LL
OW
ING
:T
HE
SE A
RE
TH
E F
OL
LO
WIN
G:
�A
MP
AC
ITY
DE
RA
TIN
GD
UE
TO
AM
PA
CIT
YD
ER
AT
ING
DU
ET
OA
MP
AC
ITY
DE
RA
TIN
GD
UE
TO
AM
PA
CIT
YD
ER
AT
ING
DU
ET
O“ “““M
OR
ET
HA
NM
OR
ET
HA
NM
OR
ET
HA
NM
OR
ET
HA
N 4949
�A
MP
AC
ITY
DE
RA
TIN
G D
UE
TO
A
MP
AC
ITY
DE
RA
TIN
G D
UE
TO
A
MP
AC
ITY
DE
RA
TIN
G D
UE
TO
A
MP
AC
ITY
DE
RA
TIN
G D
UE
TO
M
OR
E T
HA
N
MO
RE
TH
AN
M
OR
E T
HA
N
MO
RE
TH
AN
T
HR
EE
(3
) C
UR
RE
NT
CA
RR
YIN
G C
ON
DU
CT
OR
S T
HR
EE
(3
) C
UR
RE
NT
CA
RR
YIN
G C
ON
DU
CT
OR
S T
HR
EE
(3
) C
UR
RE
NT
CA
RR
YIN
G C
ON
DU
CT
OR
S T
HR
EE
(3
) C
UR
RE
NT
CA
RR
YIN
G C
ON
DU
CT
OR
S IN
A C
ON
DU
IT O
R C
AB
LE
IN A
CO
ND
UIT
OR
CA
BL
EIN
A C
ON
DU
IT O
R C
AB
LE
IN A
CO
ND
UIT
OR
CA
BL
E”,
”,
”,
”,
an
d…
an
d…
an
d…
an
d…
�C
orr
ect
ion
to
th
e c
on
du
cto
r C
orr
ect
ion
to
th
e c
on
du
cto
r C
orr
ect
ion
to
th
e c
on
du
cto
r C
orr
ect
ion
to
th
e c
on
du
cto
r a
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sa
mp
aci
tie
sw
he
n
wh
en
w
he
n
wh
en
in
sta
lle
d o
r o
pe
rate
d a
t te
mp
era
ture
s o
ve
r o
r in
sta
lle
d o
r o
pe
rate
d a
t te
mp
era
ture
s o
ve
r o
r in
sta
lle
d o
r o
pe
rate
d a
t te
mp
era
ture
s o
ve
r o
r in
sta
lle
d o
r o
pe
rate
d a
t te
mp
era
ture
s o
ve
r o
r u
nd
er
30
de
g C
am
bie
nt
un
de
r 3
0 d
eg
C a
mb
ien
tu
nd
er
30
de
g C
am
bie
nt
un
de
r 3
0 d
eg
C a
mb
ien
t.
THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) THERM
OP
LAS
TIC
WIR
E &
CABLES
(TW
, THW
, THHN
) 60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
60
0 V
OLTS
, S
trand
ed (N
EC T
able
310
.16)
MM
Siz
eA
ppro
xim
ate
AW
G S
ize
Am
paci
tyT
W60
deg
C
Am
paci
tyT
HW
75 d
eg C
Am
paci
tyT
HH
N90
deg
C
2.0
mm
2#
1420
2025
3.5
mm
2#
1225
2530
5.5
mm
2#
1030
3540
8.0
mm
2#
840
5055
14m
m2
#6
5565
75
5050
14 m
m2
# 6
6575
22 m
m2
# 4
7085
95
30 m
m2
# 2
9511
513
0
38 m
m2
# 1
110
130
150
50 m
m2
1/0
125
150
170
60 m
m2
2/0
145
175
195
80 m
m2
3/0
165
200
225
100
mm
24/
019
523
026
0
5151
Giv
en
: 6 #
12
TH
W in
a c
on
du
it a
t a
mb
ien
t G
ive
n: 6
# 1
2 T
HW
in a
co
nd
uit
at
am
bie
nt
Giv
en
: 6 #
12
TH
W in
a c
on
du
it a
t a
mb
ien
t G
ive
n: 6
# 1
2 T
HW
in a
co
nd
uit
at
am
bie
nt
tem
pe
ratu
re o
f 4
0 d
eg
Cte
mp
era
ture
of
40
de
g C
tem
pe
ratu
re o
f 4
0 d
eg
Cte
mp
era
ture
of
40
de
g C
Q1
: Wh
at
is t
he
eff
ect
ive
am
pa
city
of
the
Q
1: W
ha
t is
th
e e
ffe
ctiv
e a
mp
aci
ty o
f th
e
Q1
: Wh
at
is t
he
eff
ect
ive
am
pa
city
of
the
Q
1: W
ha
t is
th
e e
ffe
ctiv
e a
mp
aci
ty o
f th
e
con
du
cto
r?co
nd
uct
or?
con
du
cto
r?co
nd
uct
or?
5252
Q2
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
Q2
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
Q2
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
Q2
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
con
tin
uo
us
loa
d f
or
the
cir
cuit
?co
nti
nu
ou
s lo
ad
fo
r th
e c
ircu
it?
con
tin
uo
us
loa
d f
or
the
cir
cuit
?co
nti
nu
ou
s lo
ad
fo
r th
e c
ircu
it?
Q3
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
Q3
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
Q3
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
Q3
: Wh
at
is t
he
ma
xim
um
pe
rmis
sib
le
no
nn
on
no
nn
on
- ---co
nti
nu
ou
s lo
ad
fo
r th
e c
ircu
it?
con
tin
uo
us
loa
d f
or
the
cir
cuit
?co
nti
nu
ou
s lo
ad
fo
r th
e c
ircu
it?
con
tin
uo
us
loa
d f
or
the
cir
cuit
?
Am
pa
city
: # 1
2 T
HW
= 2
0 A
(N
EC
Ta
ble
31
0A
mp
aci
ty: #
12
TH
W =
20
A (
NE
C T
ab
le 3
10
Am
pa
city
: # 1
2 T
HW
= 2
0 A
(N
EC
Ta
ble
31
0A
mp
aci
ty: #
12
TH
W =
20
A (
NE
C T
ab
le 3
10
- ---16
)1
6)
16
)1
6)
Eff
ect
ive
Am
pa
city
: 20
A x
0.8
0 x
0.8
8 =
14
.08
AE
ffe
ctiv
e A
mp
aci
ty: 2
0 A
x 0
.80
x 0
.88
= 1
4.0
8 A
Eff
ect
ive
Am
pa
city
: 20
A x
0.8
0 x
0.8
8 =
14
.08
AE
ffe
ctiv
e A
mp
aci
ty: 2
0 A
x 0
.80
x 0
.88
= 1
4.0
8 A
Nt
Nt
Nt
Nt
5353
No
tes:
N
ote
s:
No
tes:
N
ote
s:
a)
De
rati
ng
Fa
cto
r o
f 0
.80
fo
r si
x c
on
du
cto
rs in
co
nd
uit
a)
De
rati
ng
Fa
cto
r o
f 0
.80
fo
r si
x c
on
du
cto
rs in
co
nd
uit
a)
De
rati
ng
Fa
cto
r o
f 0
.80
fo
r si
x c
on
du
cto
rs in
co
nd
uit
a)
De
rati
ng
Fa
cto
r o
f 0
.80
fo
r si
x c
on
du
cto
rs in
co
nd
uit
b)
Co
rre
ctio
n F
act
or
for
of
0.8
8 f
or
am
bie
nt
tem
p o
f 4
0 d
eg
Cb
) C
orr
ect
ion
Fa
cto
r fo
r o
f 0
.88
fo
r a
mb
ien
t te
mp
of
40
de
g C
b)
Co
rre
ctio
n F
act
or
for
of
0.8
8 f
or
am
bie
nt
tem
p o
f 4
0 d
eg
Cb
) C
orr
ect
ion
Fa
cto
r fo
r o
f 0
.88
fo
r a
mb
ien
t te
mp
of
40
de
g C
�M
ax
pe
rmis
sib
le lo
ad
(C
on
t. L
oa
d)
= 1
4.0
8 x
0.8
0 o
r 1
1.2
64
AM
ax
pe
rmis
sib
le lo
ad
(C
on
t. L
oa
d)
= 1
4.0
8 x
0.8
0 o
r 1
1.2
64
AM
ax
pe
rmis
sib
le lo
ad
(C
on
t. L
oa
d)
= 1
4.0
8 x
0.8
0 o
r 1
1.2
64
AM
ax
pe
rmis
sib
le lo
ad
(C
on
t. L
oa
d)
= 1
4.0
8 x
0.8
0 o
r 1
1.2
64
A
�M
ax
pe
rmis
sib
le lo
ad
(N
on
Ma
x p
erm
issi
ble
loa
d (
No
nM
ax
pe
rmis
sib
le lo
ad
(N
on
Ma
x p
erm
issi
ble
loa
d (
No
n- ---C
on
t. L
oa
d)
= 1
4.0
8 x
1 o
r 1
4.0
8 A
Co
nt.
Lo
ad
) =
14
.08
x 1
or
14
.08
AC
on
t. L
oa
d)
= 1
4.0
8 x
1 o
r 1
4.0
8 A
Co
nt.
Lo
ad
) =
14
.08
x 1
or
14
.08
A
Q4
: Q
4:
Q4
: Q
4: W
HE
RE
SH
AL
L W
E B
ASE
TH
E O
CP
D?
WH
ER
E S
HA
LL
WE
BA
SE T
HE
OC
PD
?W
HE
RE
SH
AL
L W
E B
ASE
TH
E O
CP
D?
WH
ER
E S
HA
LL
WE
BA
SE T
HE
OC
PD
?
a)
a)
a)
a)
Pu
bli
she
d
Pu
bli
she
d
Pu
bli
she
d
Pu
bli
she
d A
mp
aci
tyA
mp
aci
tyA
mp
aci
tyA
mp
aci
tyo
f #
12
AW
G w
hic
h is
20
A?
of
#1
2 A
WG
wh
ich
is 2
0 A
? o
f #
12
AW
G w
hic
h is
20
A?
of
#1
2 A
WG
wh
ich
is 2
0 A
?
b)
Th
e ‘E
ffe
ctiv
e’
b)
Th
e ‘E
ffe
ctiv
e’
b)
Th
e ‘E
ffe
ctiv
e’
b)
Th
e ‘E
ffe
ctiv
e’ A
mp
aci
tyA
mp
aci
tyA
mp
aci
tyA
mp
aci
tyo
f #
12
AW
G w
hic
h is
14
.08
A?
of
#1
2 A
WG
wh
ich
is1
4.0
8 A
?o
f #
12
AW
G w
hic
h is
14
.08
A?
of
#1
2 A
WG
wh
ich
is1
4.0
8 A
?
5454
c) T
he
Ma
xim
um
Pe
rmis
sib
le L
oa
d w
hic
h is
11
.26
4 A
?c)
Th
e M
ax
imu
m P
erm
issi
ble
Lo
ad
wh
ich
is1
1.2
64
A?
c) T
he
Ma
xim
um
Pe
rmis
sib
le L
oa
d w
hic
h is
11
.26
4 A
?c)
Th
e M
ax
imu
m P
erm
issi
ble
Lo
ad
wh
ich
is1
1.2
64
A?
Q5
: WH
AT
WIL
L B
E T
HE
SIZ
E O
F T
HE
Q
5: W
HA
T W
ILL
BE
TH
E S
IZE
OF
TH
E
Q5
: WH
AT
WIL
L B
E T
HE
SIZ
E O
F T
HE
Q
5: W
HA
T W
ILL
BE
TH
E S
IZE
OF
TH
E
BR
AN
CH
CIR
CU
IT O
CP
D?
BR
AN
CH
CIR
CU
IT O
CP
D?
BR
AN
CH
CIR
CU
IT O
CP
D?
BR
AN
CH
CIR
CU
IT O
CP
D?
WH
AT
WIL
L B
E T
HE
SIZ
E O
F T
HE
BR
AN
CH
W
HA
T W
ILL
BE
TH
E S
IZE
OF
TH
E B
RA
NC
H
WH
AT
WIL
L B
E T
HE
SIZ
E O
F T
HE
BR
AN
CH
W
HA
T W
ILL
BE
TH
E S
IZE
OF
TH
E B
RA
NC
H
CIR
CU
IT B
RE
AK
ER
OR
FU
SE?
CIR
CU
IT B
RE
AK
ER
OR
FU
SE?
CIR
CU
IT B
RE
AK
ER
OR
FU
SE?
CIR
CU
IT B
RE
AK
ER
OR
FU
SE?
An
swe
r is
: 15
AA
nsw
er
is: 1
5 A
An
swe
r is
: 15
AA
nsw
er
is: 1
5 A
Be
cau
se o
f th
e m
an
da
tory
ma
tch
of
the
B
eca
use
of
the
ma
nd
ato
ry m
atc
h o
f th
e
Be
cau
se o
f th
e m
an
da
tory
ma
tch
of
the
B
eca
use
of
the
ma
nd
ato
ry m
atc
h o
f th
e
OC
PD
wit
h r
esp
ect
to
th
e a
mp
aci
ty o
f th
e
OC
PD
wit
h r
esp
ect
to
th
e a
mp
aci
ty o
f th
e
OC
PD
wit
h r
esp
ect
to
th
e a
mp
aci
ty o
f th
e
OC
PD
wit
h r
esp
ect
to
th
e a
mp
aci
ty o
f th
e
5555
con
du
cto
r!co
nd
uct
or!
con
du
cto
r!co
nd
uct
or!
No
te t
ha
t in
th
is c
ase
, th
e e
ffe
ctiv
e a
mp
aci
ty
No
te t
ha
t in
th
is c
ase
, th
e e
ffe
ctiv
e a
mp
aci
ty
No
te t
ha
t in
th
is c
ase
, th
e e
ffe
ctiv
e a
mp
aci
ty
No
te t
ha
t in
th
is c
ase
, th
e e
ffe
ctiv
e a
mp
aci
ty
of
the
# 1
2 c
on
du
cto
r h
ap
pe
ns
to b
e d
era
ted
o
f th
e #
12
co
nd
uct
or
ha
pp
en
s to
be
de
rate
d
of
the
# 1
2 c
on
du
cto
r h
ap
pe
ns
to b
e d
era
ted
o
f th
e #
12
co
nd
uct
or
ha
pp
en
s to
be
de
rate
d
at
14
.08
A o
nly
.a
t 1
4.0
8 A
on
ly.
at
14
.08
A o
nly
.a
t 1
4.0
8 A
on
ly.
IF T
HE
20
A O
CP
D F
OR
A #
12
IF
TH
E 2
0 A
OC
PD
FO
R A
#1
2
IF T
HE
20
A O
CP
D F
OR
A #
12
IF
TH
E 2
0 A
OC
PD
FO
R A
#1
2
AW
G C
ON
DU
CT
OR
IN
A
WG
CO
ND
UC
TO
R I
N
AW
G C
ON
DU
CT
OR
IN
A
WG
CO
ND
UC
TO
R I
N
PR
EV
IOU
S E
XE
RC
ISE
IS
TO
BE
P
RE
VIO
US
EX
ER
CIS
E I
S T
O B
E
PR
EV
IOU
S E
XE
RC
ISE
IS
TO
BE
P
RE
VIO
US
EX
ER
CIS
E I
S T
O B
E
RE
TA
INE
D…
RE
TA
INE
D…
RE
TA
INE
D…
RE
TA
INE
D…
5656
TH
E D
ER
AT
ING
&
TH
E D
ER
AT
ING
&
TH
E D
ER
AT
ING
&
TH
E D
ER
AT
ING
&
CO
RR
EC
TIO
N F
AC
TO
RS
WIL
L
CO
RR
EC
TIO
N F
AC
TO
RS
WIL
L
CO
RR
EC
TIO
N F
AC
TO
RS
WIL
L
CO
RR
EC
TIO
N F
AC
TO
RS
WIL
L
MA
KE
TH
E C
IRC
UIT
MA
KE
TH
E C
IRC
UIT
MA
KE
TH
E C
IRC
UIT
MA
KE
TH
E C
IRC
UIT
CO
ND
UC
TO
RS
BIG
GE
R…
!C
ON
DU
CT
OR
S B
IGG
ER
…!
CO
ND
UC
TO
RS
BIG
GE
R…
!C
ON
DU
CT
OR
S B
IGG
ER
…!
If y
ou
de
cid
e 2
0 A
OC
PD
, th
en
If
yo
u d
eci
de
20
A O
CP
D, t
he
n
If y
ou
de
cid
e 2
0 A
OC
PD
, th
en
If
yo
u d
eci
de
20
A O
CP
D, t
he
n
the
siz
e o
f th
e c
on
du
cto
rs s
ha
ll
the
siz
e o
f th
e c
on
du
cto
rs s
ha
ll
the
siz
e o
f th
e c
on
du
cto
rs s
ha
ll
the
siz
e o
f th
e c
on
du
cto
rs s
ha
ll
be
:b
e:
be
:b
e:
#1
0T
HW
#1
0T
HW
#1
0T
HW
#1
0T
HW
5757
# 1
0 T
HW
# 1
0 T
HW
# 1
0 T
HW
# 1
0 T
HW
No
t #
12
TH
W!
No
t #
12
TH
W!
No
t #
12
TH
W!
No
t #
12
TH
W!
ASS
UM
ING
TH
AT
TH
E D
ER
AT
ING
A
SSU
MIN
G T
HA
T T
HE
DE
RA
TIN
G
ASS
UM
ING
TH
AT
TH
E D
ER
AT
ING
A
SSU
MIN
G T
HA
T T
HE
DE
RA
TIN
G
& C
OR
RE
CT
ION
FA
CT
OR
S H
AV
E
& C
OR
RE
CT
ION
FA
CT
OR
S H
AV
E
& C
OR
RE
CT
ION
FA
CT
OR
S H
AV
E
& C
OR
RE
CT
ION
FA
CT
OR
S H
AV
E
AL
RE
AD
Y B
EE
N C
ON
SID
ER
ED
,A
LR
EA
DY
BE
EN
CO
NSI
DE
RE
D,
AL
RE
AD
Y B
EE
N C
ON
SID
ER
ED
,A
LR
EA
DY
BE
EN
CO
NSI
DE
RE
D,
Q: I
S SI
ZIN
G O
F C
IRC
UIT
S Q
: IS
SIZ
ING
OF
CIR
CU
ITS
Q: I
S SI
ZIN
G O
F C
IRC
UIT
S Q
: IS
SIZ
ING
OF
CIR
CU
ITS
FIN
ISH
ED
…?
FIN
ISH
ED
…?
FIN
ISH
ED
…?
FIN
ISH
ED
…?
5858
FIN
ISH
ED
…?
FIN
ISH
ED
…?
FIN
ISH
ED
…?
FIN
ISH
ED
…?
NO
TQ
UIT
E…
!
5959
NO
T Q
UIT
E…
!
BE
CA
USE
, B
EC
AU
SE,
BE
CA
USE
, B
EC
AU
SE,
CO
ND
UC
TO
RS
MU
STM
AT
CH
CO
ND
UC
TO
RS
MU
STM
AT
CH
CO
ND
UC
TO
RS
MU
STM
AT
CH
CO
ND
UC
TO
RS
MU
STM
AT
CH
6060
CO
ND
UC
TO
RS
MU
ST M
AT
CH
C
ON
DU
CT
OR
S M
UST
MA
TC
H
CO
ND
UC
TO
RS
MU
ST M
AT
CH
C
ON
DU
CT
OR
S M
UST
MA
TC
H
TH
E T
EM
PE
RA
TU
RE
RA
TIN
GS
TH
E T
EM
PE
RA
TU
RE
RA
TIN
GS
TH
E T
EM
PE
RA
TU
RE
RA
TIN
GS
TH
E T
EM
PE
RA
TU
RE
RA
TIN
GS
OF
CIR
CU
IT D
EV
ICE
S…O
F C
IRC
UIT
DE
VIC
ES…
OF
CIR
CU
IT D
EV
ICE
S…O
F C
IRC
UIT
DE
VIC
ES…
Wir
ing
Con
duct
or A
mpa
city
to
Tem
pera
ture
Rat
ing
�M
old
ed
-case
cir
cuit
bre
akers
are
mark
ed
wit
h
bo
th t
he s
ize
an
d in
sula
tion
tem
pera
ture
rat
ing 6161
bo
tt
es
ea
dsu
ato
tepe
atu
eat
g(e
.g.,
#2
Cu
, 6
0/
75
°C)
of
the c
on
du
cto
rsap
pro
ved
fo
r u
se w
ith
th
e c
ircu
it b
reaker.
�Pr
oper
ly s
ized
con
duct
ors
allo
w t
he
circ
uit
bre
aker
therm
al-
sen
sin
g e
lem
en
ts t
o
matc
h t
he c
on
du
cto
r th
erm
al
pro
tect
ion
req
uir
em
en
ts.
SIZ
ING
CO
ND
UC
TO
RS
BA
SE
D
ON
TEM
PER
ATU
RE R
ATIN
G 6262
Whe
n se
lect
ing
a co
nduc
tor
for
a ci
rcui
t, o
ne h
as t
o be
se
lect
ed t
o ac
com
mod
ate
the
tem
pera
ture
ter
min
atio
n ra
ting
rul
esou
tlin
ed in
NEC
110
-14(
c). T
his
incl
udes
th
e co
mpa
tibi
lity
of a
con
duct
or t
ype
as t
o th
e O
CPD
’s
& o
ther
dev
ices
the
con
duct
or t
erm
inat
es in
side
an
encl
osur
e.
SIZ
ING
CO
ND
UC
TO
RS
BA
SED
ON
TEM
PER
ATU
RE R
ATIN
G
�U
nd
erw
rite
r La
bo
rato
ries
Inc.
(U
L) s
tan
dard
s re
qu
ire t
hat
mo
lded
-case
cir
cuit
bre
akers
rate
d
at
12
5 a
mp
ere
s o
r le
ss b
e m
ark
ed
wit
h t
he
con
du
cto
r in
sula
tio
n-t
em
pera
ture
rati
ng
.
�Th
e w
ire t
em
pera
ture
rati
ng
is
dete
rmin
ed
by 6363
test
ing
th
e c
ircu
it b
reaker
un
der
full-l
oad
cu
rren
t w
ith
co
nd
uct
ors
siz
ed
fo
r th
e
ap
pro
pri
ate
tem
pera
ture
rati
ng
, 6
0°C
or
75
°C.
SIZ
ING
CO
ND
UC
TO
RS
BA
SED
ON
TEM
PER
ATU
RE R
ATIN
G
�C
ondu
ctor
s w
ith
90°C
rat
ed in
sula
tion
(T
HH
N)
can
be u
sed
on c
ircu
it b
reak
ers
rate
d fo
r 60
°C
or 7
5°C
wir
ing
only
if t
heir
siz
e is
bas
ed o
n th
e am
paci
ty o
f th
e lo
wer
tem
pera
ture
-rat
ed w
ire.
�If
th90
°C(T
HH
N)
ii
tb
6464
�If
the
90°
C (
TH
HN
) w
ire
size
wer
e to
be
sele
cted
bas
ed o
n th
e am
paci
ty a
llow
ed in
the
90
°C c
olum
n of
the
Am
paci
ty T
able
, the
sm
alle
r re
sult
ing
wir
e si
ze w
ould
gen
erat
e ad
diti
onal
he
at a
t th
e ci
rcui
t br
eake
r te
rmin
als
and
poss
ibly
cau
se n
uisa
nce
trip
ping
.
SIZ
ING
CO
ND
UC
TO
RS
BA
SED
ON
TEM
PER
ATU
RE R
ATIN
G
6565
NEC
Tab
le 3
10
.16
6666
NEC
Tab
le 3
10
.16
6767
IMP
OR
TAN
T!!!
PO
INT
1:Fo
r de
vice
or
equi
pmen
t te
rmin
als
rate
d 10
0 A
or
less
,wir
e si
zes
shal
l be
base
d on
th
e‘6
0de
gC
SIZ
ING
CO
ND
UC
TO
RS
B
AS
ED
ON
TEM
PER
ATU
RE R
ATIN
G
6868
the
60 d
eg C
te
mpe
ratu
re r
atin
g’lis
ted
in N
EC A
mpa
city
Ta
ble
310-
16.
NEC
Tab
le 3
10
.16
6969
SIZ
ING
C
ON
DU
CTO
RS
B
AS
ED
ON
TEM
PER
ATU
RE
RA
TIN
G
PO
INT
2:
Cir
cuit
s ov
er 1
00A
[NE
C
Sec
. 110
-14(
c)(2
)]:
Unl
ess
the
term
inal
s ar
e m
arke
d ot
herw
ise,
i
t/d
i
7070
equi
pmen
t/ d
evic
e
term
inal
s ra
ted
over
100
A
shal
l be
size
d ac
cord
ing
to
the
‘75
deg
C t
empe
ratu
re
rati
ng’l
iste
d in
NE
C T
able
31
0-16
.
SIZ
ING
CO
ND
UC
TO
RS
BA
SE
D O
N
TEM
PER
ATU
RE R
ATIN
G
Thi
s is
now
the
cat
ch!
Nin
ety
deg
C r
ated
con
duct
or a
mpa
citi
es li
ke t
he
THH
N’s
can
not
be
typi
cally
use
d fo
r si
zing
cir
cuit
co
nduc
tors
.How
ever
, its
rat
ing
only
com
es in
to p
lay
PO
INT
3:
Wha
t th
en is
the
pur
pose
of
90
deg
C w
ire
if w
e ca
nnot
use
its
high
er a
mpa
city
?
7171
whe
n ad
just
ing
cond
ucto
r am
paci
ty fo
r el
evat
ed
ambi
ent
tem
pera
ture
(cor
rect
ion
due
to t
empe
ratu
re)o
r w
hen
bund
ling
mor
e th
an t
hree
cur
rent
-car
ryin
g co
nduc
tors
tog
ethe
r (d
erat
ing)
.
The
adv
anta
ge o
f 90
deg
C w
ire
(TH
HN
) is
tha
t it
can
ke
ep t
he d
esig
ner
from
usi
ng a
larg
er w
ire
(whe
n am
paci
ty a
djus
tmen
ts a
re n
eede
d),w
hich
req
uire
larg
er
cond
uits
& r
acew
ays,
gre
ater
labo
r &
incr
ease
d m
ater
ial c
osts
.
7272
TO R
EV
IEW
:
�Im
port
ant
in t
he e
lect
rica
l & t
herm
al r
elat
ions
hip
for
circ
uit
com
pone
nts
are
the
cond
ucto
r si
ze, r
ated
am
paci
ty, t
he in
sula
tion
tem
pera
ture
rat
ing
and
the
perm
issi
ble
conn
ecto
r de
vice
tem
pera
ture
lim
its.
�Fo
r in
stan
ce, t
he a
mpa
city
for
a c
ondu
ctor
wit
h 90
°C
7373
insu
lati
on (
TH
HN
) is
gen
eral
ly g
reat
er t
han
of a
con
duct
or
of t
he s
ame
size
but
wit
h 60
°C (
TW
) in
sula
tion
.
�H
owev
er, t
he g
reat
er a
mpa
city
of
a T
HH
N c
ondu
ctor
wit
h 90
°C in
sula
tion
is n
ot a
lway
s pe
rmit
ted
to b
e us
ed d
ue t
o lim
itat
ions
of
the
term
inal
tem
pera
ture
rat
ing
and/
or t
he
requ
irem
ents
of
the
NE
C®
. (R
efer
ence
110
.14
in t
he N
EC
®
for
spec
ific
req
uire
men
ts.)
How
ever
, th
ere
are
som
e si
mple
rul
es to
How
ever
, th
ere
are
som
e si
mple
rul
es to
How
ever
, th
ere
are
som
e si
mple
rul
es to
How
ever
, th
ere
are
som
e si
mple
rul
es to
follo
w f
or ci
rcui
ts o
f 10
0A a
nd les
s.
follo
w f
or ci
rcui
ts o
f 10
0A a
nd les
s.
follo
w f
or ci
rcui
ts o
f 10
0A a
nd les
s.
follo
w f
or ci
rcui
ts o
f 10
0A a
nd les
s.
The
se s
imple
rul
es g
ener
ally
sho
uld b
e The
se s
imple
rul
es g
ener
ally
sho
uld b
e The
se s
imple
rul
es g
ener
ally
sho
uld b
e The
se s
imple
rul
es g
ener
ally
sho
uld b
e fo
llow
ed b
ecaus
e th
ese
are
the
norm
s fo
r th
e fo
llow
ed b
ecaus
e th
ese
are
the
norm
s fo
r th
e fo
llow
ed b
ecaus
e th
ese
are
the
norm
s fo
r th
e fo
llow
ed b
ecaus
e th
ese
are
the
norm
s fo
r th
e dev
ice
com
pone
nt p
roduc
t st
and
ard
s and
dev
ice
com
pone
nt p
roduc
t st
and
ard
s and
dev
ice
com
pone
nt p
roduc
t st
and
ard
s and
dev
ice
com
pone
nt p
roduc
t st
and
ard
s and
7474
pp
pp
pp
pp
per
form
anc
e ev
alu
ation
to the
se s
tand
ard
s per
form
anc
e ev
alu
ation
to the
se s
tand
ard
s per
form
anc
e ev
alu
ation
to the
se s
tand
ard
s per
form
anc
e ev
alu
ation
to the
se s
tand
ard
s fo
r fu
ses,
blo
cks,
dis
conn
ects
, ho
lder
s, c
ircu
it
for fu
ses,
blo
cks,
dis
conn
ects
, ho
lder
s, c
ircu
it
for fu
ses,
blo
cks,
dis
conn
ects
, ho
lder
s, c
ircu
it
for fu
ses,
blo
cks,
dis
conn
ects
, ho
lder
s, c
ircu
it
bre
aker
s, e
tc.
bre
aker
s, e
tc.
bre
aker
s, e
tc.
bre
aker
s, e
tc.
Sim
ple rul
es f
or 10
0 a
mps
and
les
sS
imple rul
es f
or 10
0 a
mps
and
les
sS
imple rul
es f
or 10
0 a
mps
and
les
sS
imple rul
es f
or 10
0 a
mps
and
les
s: :::
1. U
se
1. U
se
1. U
se
1. U
se 6
060
60
60
° °°°C rate
d c
ond
ucto
rsC rate
d c
ond
ucto
rsC rate
d c
ond
ucto
rsC rate
d c
ond
ucto
rs[110
.14(C
)(1)(a
)(1)].
Thi
s [110
.14(C
)(1)(a
)(1)].
Thi
s [110
.14(C
)(1)(a
)(1)].
Thi
s [110
.14(C
)(1)(a
)(1)].
Thi
s ass
umes
all
term
inations
are
rate
d f
or 60
ass
umes
all
term
inations
are
rate
d f
or 60
ass
umes
all
term
inations
are
rate
d f
or 60
ass
umes
all
term
inations
are
rate
d f
or 60
° °°°C rate
d
C rate
d
C rate
d
C rate
d
cond
ucto
rs.
cond
ucto
rs.
cond
ucto
rs.
cond
ucto
rs.
2. Hig
her te
mper
atu
re rate
d c
ond
ucto
rs c
an
be
used
, 2
. Hig
her te
mper
atu
re rate
d c
ond
ucto
rs c
an
be
used
, 2
. Hig
her te
mper
atu
re rate
d c
ond
ucto
rs c
an
be
used
, 2
. Hig
her te
mper
atu
re rate
d c
ond
ucto
rs c
an
be
used
,
7575
but
the
but
the
but
the
but
the
am
paci
ty o
f th
ese
cond
ucto
rs m
ust be
as
if
am
paci
ty o
f th
ese
cond
ucto
rs m
ust be
as
if
am
paci
ty o
f th
ese
cond
ucto
rs m
ust be
as
if
am
paci
ty o
f th
ese
cond
ucto
rs m
ust be
as
if
they
are
60
they
are
60
they
are
60
they
are
60
° °°°C rate
d c
ond
ucto
rsC rate
d c
ond
ucto
rsC rate
d c
ond
ucto
rsC rate
d c
ond
ucto
rs. . . .
In o
ther
word
s, e
ven
if a
90
In o
ther
word
s, e
ven
if a
90
In o
ther
word
s, e
ven
if a
90
In o
ther
word
s, e
ven
if a
90
° °°°C T
HHN
cond
ucto
r is
C T
HHN
cond
ucto
r is
C T
HHN
cond
ucto
r is
C T
HHN
cond
ucto
r is
us
ed, it h
as
to b
e ra
ted f
or am
paci
ty a
s if it w
ere
a
used
, it h
as
to b
e ra
ted f
or am
paci
ty a
s if it w
ere
a
used
, it h
as
to b
e ra
ted f
or am
paci
ty a
s if it w
ere
a
used
, it h
as
to b
e ra
ted f
or am
paci
ty a
s if it w
ere
a
60
60
60
60
° °°°C c
ond
ucto
r [110
.14(C
)(1)(a
)(2
)]..
C c
ond
ucto
r [110
.14(C
)(1)(a
)(2
)]..
C c
ond
ucto
r [110
.14(C
)(1)(a
)(2
)]..
C c
ond
ucto
r [110
.14(C
)(1)(a
)(2
)]..
For
inst
ance
, ass
ume
an a
mpa
city
of
60A
is n
eede
d in
a c
ircu
it
that
has
ter
min
atio
ns t
hat
are
rate
d fo
r 60
°C c
ondu
ctor
s. I
f a
90°C
con
duct
or is
to
be u
sed,
wha
t is
the
min
imum
con
duct
or
size
req
uire
d?
7676
Th
e a
nsw
er
is 4
AW
G, 9
0°C
con
duct
or.
A 6
AW
G,
90
°C c
on
du
cto
r h
as
an
am
paci
ty o
f 7
5 a
mp
s p
er
(NEC
® T
ab
le 3
10
.16
); b
ut
this
am
paci
ty c
an
no
t b
e u
sed
fo
r a 6
0°C
term
inati
on
.
For
this
cir
cuit
, if
a 9
0°C
, 6
AW
G c
on
du
cto
r is
eva
luate
d,
the
am
paci
ty o
f th
is c
on
du
cto
r m
ust
be a
cco
rdin
g t
o t
he 6
0°C
co
nd
uct
or
am
paci
ty,
wh
ich
is
55
A.
(Am
paci
ties
are
fro
m N
EC
®
Tab
le 3
10
.16
.)
3. C
ondu
ctor
s w
ith
high
er t
empe
ratu
re r
atin
gs
can
be u
sed
at t
heir
rat
ed a
mpa
citi
es if
the
te
rmin
atio
ns o
f th
e ci
rcui
t de
vice
s ar
e ra
ted
for
the
high
er t
empe
ratu
re r
ated
con
duct
or
[110
.14(
C)(
1)(a
)(3)
].
7777
How
ever
, the
indu
stry
nor
m is
tha
t m
ost
devi
ces
rate
d 10
0A o
r le
ss, s
uch
as b
lock
s,
disc
onne
cts
and
circ
uit
brea
kers
, hav
e 60
°C
or 7
5°C
rat
ed t
erm
inat
ions
.
4. F
or m
otor
s w
ith
desi
gn le
tter
s B
, C o
r D
, co
nduc
tors
wit
h in
sula
tion
rat
ing
of 7
5°C
of
high
er a
re p
erm
itte
d as
long
as
the
ampa
city
of
the
con
duct
ors
is n
ot g
reat
er t
han
the
75°C
rat
ing
[110
.14(
C)(
1)(a
)(4)
].
7878
5. I
f a
cond
ucto
r is
run
bet
wee
n tw
o de
vice
s th
at h
ave
term
inal
s ra
ted
at t
wo
diff
eren
t te
mpe
ratu
res,
the
rul
es a
bove
mus
t be
ob
serv
ed t
hat
corr
elat
e to
the
ter
min
al w
ith
the
low
est
tem
pera
ture
rat
ing .
For ci
rcui
ts
For ci
rcui
ts
For ci
rcui
ts
For ci
rcui
ts g
reate
r th
an
gre
ate
r th
an
gre
ate
r th
an
gre
ate
r th
an
100
A10
0A
100
A10
0A, us
e co
nduc
tors
with
, us
e co
nduc
tors
with
, us
e co
nduc
tors
with
, us
e co
nduc
tors
with
at least
a
at least
a
at least
a
at least
a 7
575
75
75° °°°C
ins
ulation
C ins
ulation
C ins
ulation
C ins
ulation
7979
rating
at th
eir 75
rating
at th
eir 75
rating
at th
eir 75
rating
at th
eir 75° °°°C
C
C
C
am
paci
ty rating
am
paci
ty rating
am
paci
ty rating
am
paci
ty rating
. ...
So w
hy w
oul
d a
nyone
eve
r w
ant
to u
se a
cond
ucto
r S
o w
hy w
oul
d a
nyone
eve
r w
ant
to u
se a
cond
ucto
r S
o w
hy w
oul
d a
nyone
eve
r w
ant
to u
se a
cond
ucto
r S
o w
hy w
oul
d a
nyone
eve
r w
ant
to u
se a
cond
ucto
r w
ith
a 9
0w
ith
a 9
0w
ith
a 9
0w
ith
a 9
0° °°°C
or a 10
5C o
r a 10
5C o
r a 10
5C o
r a 10
5° °°°C
rating
if
they
can’
t be
applie
d
C rating
if
they
can’
t be
applie
d
C rating
if
they
can’
t be
applie
d
C rating
if
they
can’
t be
applie
d
at th
eir am
paci
ty rating
s fo
r th
ose
tem
per
atu
res?
at th
eir am
paci
ty rating
s fo
r th
ose
tem
per
atu
res?
at th
eir am
paci
ty rating
s fo
r th
ose
tem
per
atu
res?
at th
eir am
paci
ty rating
s fo
r th
ose
tem
per
atu
res?
The
ans
wer
lie
s in
the
fact
tha
t The
ans
wer
lie
s in
the
fact
tha
t The
ans
wer
lie
s in
the
fact
tha
t The
ans
wer
lie
s in
the
fact
tha
t th
ose
hig
her am
paci
ty rating
s th
ose
hig
her am
paci
ty rating
s th
ose
hig
her am
paci
ty rating
s th
ose
hig
her am
paci
ty rating
s
8080
gp
yg
gp
yg
gp
yg
gp
yg
can
be
utilized
whe
n der
ating
due
ca
n be
utilized
whe
n der
ating
due
ca
n be
utilized
whe
n der
ating
due
ca
n be
utilized
whe
n der
ating
due
to
am
bient
cond
itio
ns o
r due
to
to a
mbient
cond
itio
ns o
r due
to
to a
mbient
cond
itio
ns o
r due
to
to a
mbient
cond
itio
ns o
r due
to
exce
edin
g m
ore
tha
n 3 c
urre
nt
exce
edin
g m
ore
tha
n 3 c
urre
nt
exce
edin
g m
ore
tha
n 3 c
urre
nt
exce
edin
g m
ore
tha
n 3 c
urre
nt
carryin
g c
ond
ucto
rs in
a
carryin
g c
ond
ucto
rs in
a
carryin
g c
ond
ucto
rs in
a
carryin
g c
ond
ucto
rs in
a
race
way
race
way
race
way
race
way. ...
Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5° °°°C CCC
8181
Ass
ume
that an
am
paci
ty o
f 60
A is
need
ed in
a c
ircu
it w
ith a
Ass
ume
that an
am
paci
ty o
f 60
A is
need
ed in
a c
ircu
it w
ith a
Ass
ume
that an
am
paci
ty o
f 60
A is
need
ed in
a c
ircu
it w
ith a
Ass
ume
that an
am
paci
ty o
f 60
A is
need
ed in
a c
ircu
it w
ith a
75
75
75
75° °°°C
ter
min
ation
at one
end
and a
60
C ter
min
ation
at one
end
and
a 6
0C ter
min
ation
at one
end
and
a 6
0C ter
min
ation
at one
end
and
a 6
0° °°°C
ter
min
ation
at th
e oth
er
C ter
min
ation
at th
e oth
er
C ter
min
ation
at th
e oth
er
C ter
min
ation
at th
e oth
er
end, w
her
e th
e am
bie
nt is
45
end, w
her
e th
e am
bie
nt is
45
end, w
her
e th
e am
bie
nt is
45
end, w
her
e th
e am
bie
nt is
45° °°°C
. C.
C.
C.
First
, si
nce
one
ter
min
ation
tem
per
atu
re rating
is
hig
her
than
the
First
, si
nce
one
ter
min
ation
tem
per
atu
re rating
is
hig
her
than
the
First
, si
nce
one
ter
min
ation
tem
per
atu
re rating
is
hig
her
than
the
First
, si
nce
one
ter
min
ation
tem
per
atu
re rating
is
hig
her
than
the
oth
er, th
e lo
wes
t one
mus
t be
used
, w
hic
h is
60
oth
er, th
e lo
wes
t one
mus
t be
used
, w
hic
h is
60
oth
er, th
e lo
wes
t one
mus
t be
used
, w
hic
h is
60
oth
er, th
e lo
wes
t one
mus
t be
used
, w
hic
h is
60
° °°°C. The
firs
t C. The
firs
t C. The
firs
t C. The
firs
t ch
oice
mig
ht be
a
choice
mig
ht be
a
choice
mig
ht be
a
choice
mig
ht be
a 4
AW
G T
W4
AW
G T
W4
AW
G T
W4
AW
G T
Wco
nduc
tor w
ith
an
am
paci
ty o
f co
nduc
tor w
ith
an
am
paci
ty o
f co
nduc
tor w
ith
an
am
paci
ty o
f co
nduc
tor w
ith
an
am
paci
ty o
f 70
A a
t 60
70
A a
t 60
70
A a
t 60
70
A a
t 60
° °°°C.
C.
C.
C.
Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5° °°°C CCC
How
ever
, in
the
NEC® the
Correc
tion
Fact
ors
rev
eals
that th
e 70
A
How
ever
, in
the
NEC® the
Correc
tion
Fact
ors
rev
eals
that th
e 70
A
How
ever
, in
the
NEC® the
Correc
tion
Fact
ors
rev
eals
that th
e 70
A
How
ever
, in
the
NEC® the
Correc
tion
Fact
ors
rev
eals
that th
e 70
A
8282
am
paci
ty m
ust be
der
ate
d d
ue to the
45
am
paci
ty m
ust be
der
ate
d d
ue to the
45
am
paci
ty m
ust be
der
ate
d d
ue to the
45
am
paci
ty m
ust be
der
ate
d d
ue to the
45° °°°C
am
bie
nt, by a
fact
or of
C a
mbie
nt, by a
fact
or of
C a
mbie
nt, by a
fact
or of
C a
mbie
nt, by a
fact
or of
0.7
1. Thi
s yie
lds
a n
ew a
mpaci
ty o
f 4
9.7
A, w
hic
h is
les
s th
an
the
0.7
1. Thi
s yie
lds
a n
ew a
mpaci
ty o
f 4
9.7
A, w
hic
h is
les
s th
an
the
0.7
1. Thi
s yie
lds
a n
ew a
mpaci
ty o
f 4
9.7
A, w
hic
h is
les
s th
an
the
0.7
1. Thi
s yie
lds
a n
ew a
mpaci
ty o
f 4
9.7
A, w
hic
h is
les
s th
an
the
requi
red 6
0. This
is
wher
e a c
ond
ucto
r w
ith a
hig
her
tem
per
atu
re
requi
red 6
0. This
is
wher
e a c
ond
ucto
r w
ith a
hig
her
tem
per
atu
re
requi
red 6
0. This
is
wher
e a c
ond
ucto
r w
ith a
hig
her
tem
per
atu
re
requi
red 6
0. This
is
wher
e a c
ond
ucto
r w
ith a
hig
her
tem
per
atu
re
rating
bec
om
es u
sefu
l. A 4
AW
G T
HHN
cond
ucto
r has
a 9
0ra
ting
bec
om
es u
sefu
l. A 4
AW
G T
HHN
cond
ucto
r has
a 9
0ra
ting
bec
om
es u
sefu
l. A 4
AW
G T
HHN
cond
ucto
r has
a 9
0ra
ting
bec
om
es u
sefu
l. A 4
AW
G T
HHN
cond
ucto
r has
a 9
0° °°°C
C
C
C
am
paci
ty o
f 9
5A.
am
paci
ty o
f 9
5A.
am
paci
ty o
f 9
5A.
am
paci
ty o
f 9
5A.
Again
, lo
okin
g a
t th
e ta
ble
at th
e bottom
of
Table
310
.16, a f
act
or
Again
, lo
okin
g a
t th
e ta
ble
at th
e bottom
of
Table
310
.16, a f
act
or
Again
, lo
okin
g a
t th
e ta
ble
at th
e bottom
of
Table
310
.16, a f
act
or
Again
, lo
okin
g a
t th
e ta
ble
at th
e bottom
of
Table
310
.16, a f
act
or
of
.87 m
ust be
used
, due
to the
45
of
.87 m
ust be
used
, due
to the
45
of
.87 m
ust be
used
, due
to the
45
of
.87 m
ust be
used
, due
to the
45° °°°C
am
bie
nt. This
yie
lds
a n
ew
C a
mbie
nt. This
yie
lds
a n
ew
C a
mbie
nt. This
yie
lds
a n
ew
C a
mbie
nt. This
yie
lds
a n
ew
am
paci
ty o
f 82
.65, w
hic
h is
adeq
uate
for th
e re
qui
red 6
0A
am
paci
ty o
f 82
.65, w
hic
h is
adeq
uate
for th
e re
qui
red 6
0A
am
paci
ty o
f 82
.65, w
hic
h is
adeq
uate
for th
e re
qui
red 6
0A
am
paci
ty o
f 82
.65, w
hic
h is
adeq
uate
for th
e re
qui
red 6
0A
am
paci
ty.
am
paci
ty.
am
paci
ty.
am
paci
ty.
Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5Exa
mple
: Circu
it a
mpaci
ty req
uire
d: 60
am
ps,
Am
bie
nt: 4
5° °°°C CCC
Coul
d a
6 A
WG
THHN
cond
ucto
r be
used
in
this
applic
ation?
Coul
d a
6 A
WG
THHN
cond
ucto
r be
used
in
this
applic
ation?
Coul
d a
6 A
WG
THHN
cond
ucto
r be
used
in
this
applic
ation?
Coul
d a
6 A
WG
THHN
cond
ucto
r be
used
in
this
applic
ation?
Its
Its
Its
Its
90
90
90
90
° °°°C a
mpacity
is
75A. U
sing
the
fact
or of
0.8
7 f
or th
e 4
5C a
mpaci
ty is
75A. U
sing the
fact
or of
0.8
7 f
or th
e 4
5C a
mpaci
ty is
75A. U
sing the
fact
or of
0.8
7 f
or th
e 4
5C a
mpaci
ty is
75A. U
sing the
fact
or of
0.8
7 f
or th
e 4
5° °°°C
C
C
C
am
bie
nt g
ives
a n
ew a
mpaci
ty o
f 65.2
5, w
hich
see
ms
adeq
uate
for
am
bie
nt g
ives
a n
ew a
mpaci
ty o
f 65.2
5, w
hich
see
ms
adeq
uate
for
am
bie
nt g
ives
a n
ew a
mpaci
ty o
f 65.2
5, w
hich
see
ms
adeq
uate
for
am
bie
nt g
ives
a n
ew a
mpaci
ty o
f 65.2
5, w
hich
see
ms
adeq
uate
for
a req
uire
d a
mpaci
ty o
f 60
A.
a req
uire
d a
mpaci
ty o
f 60
A.
a req
uire
d a
mpaci
ty o
f 60
A.
a req
uire
d a
mpaci
ty o
f 60
A.
8383
How
ever
, a
How
ever
, a
How
ever
, a
How
ever
, a 6
AW
G c
ond
ucto
r of
any
ins
ulation
rating
coul
d n
ever
6 A
WG
cond
ucto
r of
any
ins
ulation
rating
coul
d n
ever
6 A
WG
cond
ucto
r of
any
ins
ulation
rating
coul
d n
ever
6 A
WG
cond
ucto
r of
any
ins
ulation
rating
coul
d n
ever
be
used
in
this
applic
ation
bec
aus
e th
e 60
be
used
in
this
applic
ation
bec
aus
e th
e 60
be
used
in
this
applic
ation
bec
aus
e th
e 60
be
used
in
this
applic
ation
bec
aus
e th
e 60
° °°°C ter
min
al re
qui
res
that
C ter
min
al re
qui
res
that
C ter
min
al re
qui
res
that
C ter
min
al re
qui
res
that
the
smalle
st a
moun
t of
copper
is
a 4
AW
G f
or a 6
0A a
mpaci
ty.
the
smalle
st a
moun
t of
copper
is
a 4
AW
G f
or a 6
0A a
mpaci
ty.
the
smalle
st a
moun
t of
copper
is
a 4
AW
G f
or a 6
0A a
mpaci
ty.
the
smalle
st a
moun
t of
copper
is
a 4
AW
G f
or a 6
0A a
mpaci
ty.
The
The
The
The
am
oun
t of
copper
ass
oci
ate
d w
ith
a 4
AW
G c
ond
ucto
ram
oun
t of
copper
ass
oci
ate
d w
ith
a 4
AW
G c
ond
ucto
ram
oun
t of
copper
ass
oci
ate
d w
ith
a 4
AW
G c
ond
ucto
ram
oun
t of
copper
ass
oci
ate
d w
ith
a 4
AW
G c
ond
ucto
ris
is
is
is
re
qui
red
requi
red
requi
red
requi
red to b
leed
the
right am
oun
t of
hea
t aw
ay f
rom
the
term
inal
to b
leed
the
right am
oun
t of
hea
t aw
ay f
rom
the
term
inal
to b
leed
the
right am
oun
t of
hea
t aw
ay f
rom
the
term
inal
to b
leed
the
right am
oun
t of
hea
t aw
ay f
rom
the
term
inal . . . .
The
use
of
less
copper
won’
t ble
ed e
noug
h hea
t aw
ay, and
ther
efore
The
use
of
less
copper
won’
t ble
ed e
noug
h hea
t aw
ay, and
ther
efore
The
use
of
less
copper
won’
t ble
ed e
noug
h hea
t aw
ay, and
ther
efore
The
use
of
less
copper
won’
t ble
ed e
noug
h hea
t aw
ay, and
ther
efore
ove
rhea
ting
pro
ble
ms
coul
d res
ult.
ove
rhea
ting
pro
ble
ms
coul
d res
ult.
ove
rhea
ting
pro
ble
ms
coul
d res
ult.
ove
rhea
ting
pro
ble
ms
coul
d res
ult.
Thi
s is
now
the
cat
ch!
The
adv
anta
ge o
f 90
deg
C w
ire
(TH
HN
) is
tha
t it
can
kee
p th
e de
sign
er f
rom
usi
ng a
larg
er w
ire
(whe
n am
paci
ty a
djus
tmen
ts a
re
dd)
hih
il
8484
need
ed),
whi
ch r
equi
re la
rger
co
ndui
ts &
rac
eway
s, g
reat
er la
bor
& in
crea
sed
mat
eria
l cos
ts.
20
08
NEC
11
0.1
4(C
)(1
)
8585
20
08
NEC
11
0.1
4(C
)(1
)(a)(
1…
4)
8686
20
08
NEC
11
0.1
4(C
)(1
)(a)(
4)(
1…
2)
8787
AT
TH
IS T
IME
,A
T T
HIS
TIM
E,
AT
TH
IS T
IME
,A
T T
HIS
TIM
E,
IS S
IZIN
G O
F C
IRC
UIT
S IS
SIZ
ING
OF
CIR
CU
ITS
IS S
IZIN
G O
F C
IRC
UIT
S IS
SIZ
ING
OF
CIR
CU
ITS
FIN
ISH
ED
?F
INIS
HE
D?
FIN
ISH
ED
?F
INIS
HE
D?
8888
FIN
ISH
ED
…?
FIN
ISH
ED
…?
FIN
ISH
ED
…?
FIN
ISH
ED
…?
NO
T Q
UIT
E…
!
BE
CA
USE
TH
E C
IRC
UIT
B
EC
AU
SE T
HE
CIR
CU
IT
BE
CA
USE
TH
E C
IRC
UIT
B
EC
AU
SE T
HE
CIR
CU
IT
OV
ER
OV
ER
OV
ER
OV
ER
- ---CU
RR
EN
T P
RO
TE
CT
OR
S C
UR
RE
NT
PR
OT
EC
TO
RS
CU
RR
EN
T P
RO
TE
CT
OR
S C
UR
RE
NT
PR
OT
EC
TO
RS
MA
Y B
E T
HE
ON
ES
TO
ST
AR
T
MA
Y B
E T
HE
ON
ES
TO
ST
AR
T
MA
Y B
E T
HE
ON
ES
TO
ST
AR
T
MA
Y B
E T
HE
ON
ES
TO
ST
AR
T
A F
UL
LA
FU
LL
A F
UL
LA
FU
LL
- ---BL
OW
N F
IRE
…!
BL
OW
N F
IRE
…!
BL
OW
N F
IRE
…!
BL
OW
N F
IRE
…!
8989
Ho
w C
om
e…
?H
ow
Co
me
…?
Ho
w C
om
e…
?H
ow
Co
me
…?
SIZ
ING
OC
PD
’S B
AS
ED
ON
TEM
PER
ATU
RE R
ATIN
GS
9090
9191
INTER
RU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
Fa
ult
Fa
ult
Fa
ult
Fa
ult
Du
tie
sD
uti
es
Du
tie
sD
uti
es
(in
(in
(in
(in
a aaasi
mp
list
icsi
mp
list
icsi
mp
list
icsi
mp
list
icvi
ew)
view
)vi
ew)
view
)d
ep
en
dd
ep
en
dd
ep
en
dd
ep
en
dla
rge
lyla
rge
lyla
rge
lyla
rge
ly(a
mo
ng
(am
on
g(a
mo
ng
(am
on
go
ther
oth
ero
ther
oth
erfa
cto
rs)
fact
ors
)fa
cto
rs)
fact
ors
)o
no
no
no
nth
eth
eth
eth
esi
zesi
zesi
zesi
zeo
fo
fo
fo
fth
eth
eth
eth
eso
urc
eso
urc
eso
urc
eso
urc
etr
an
sfo
rme
rtr
an
sfo
rme
rtr
an
sfo
rme
rtr
an
sfo
rme
ra
nd
an
da
nd
an
dth
eth
eth
eth
eim
pe
da
nce
imp
ed
an
ceim
pe
da
nce
imp
ed
an
ceo
fo
fo
fo
fth
eth
eth
eth
eca
ble
sca
ble
sca
ble
sca
ble
sb
efo
reb
efo
reb
efo
reb
efo
reth
eth
eth
eth
ep
oin
tsp
oin
tsp
oin
tsp
oin
tsw
he
rew
he
rew
he
rew
he
reth
eth
eth
eth
efa
ult
fau
ltfa
ult
fau
ltis isisis
sub
ject
ing
sub
ject
ing
sub
ject
ing
sub
ject
ing
to tototo. ... 9292
Fo
rF
or
Fo
rF
or
inst
an
ce,
inst
an
ce,
inst
an
ce,
inst
an
ce,
if ifififa aaa
23
02
30
23
02
30
v vvvli
gh
tin
gli
gh
tin
gli
gh
tin
gli
gh
tin
gp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdp
an
elb
oa
rdis isisis
rece
ivin
gre
ceiv
ing
rece
ivin
gre
ceiv
ing
sup
ply
sup
ply
sup
ply
sup
ply
fro
mfr
om
fro
mfr
om
a aaa5
00
50
05
00
50
0K
VA
KV
AK
VA
KV
Atr
an
sfo
rme
r,tr
an
sfo
rme
r,tr
an
sfo
rme
r,tr
an
sfo
rme
r,th
eth
eth
eth
eth
ree
thre
eth
ree
thre
e- ---p
ha
sep
ha
sep
ha
sep
ha
sefa
ult
fau
ltfa
ult
fau
ltd
uty
du
tyd
uty
du
tya
ta
ta
ta
tit
sit
sit
sit
sse
con
da
ryse
con
da
ryse
con
da
ryse
con
da
ryte
rmin
als
term
ina
lste
rmin
als
term
ina
lsco
uld
cou
ldco
uld
cou
ldb
eb
eb
eb
ea
sa
sa
sa
sh
igh
hig
hh
igh
hig
ha
sa
sa
sa
s3
03
03
03
0k
ilo
kil
ok
ilo
kil
o- ---a
mp
ere
sa
mp
ere
sa
mp
ere
sa
mp
ere
s. ...
If IfIfIfth
eth
eth
eth
eso
urc
eso
urc
eso
urc
eso
urc
etr
an
sfo
rme
rtr
an
sfo
rme
rtr
an
sfo
rme
rtr
an
sfo
rme
ris isisis
1 111, ,,,5
00
50
05
00
50
0K
VA
,K
VA
,K
VA
,K
VA
,th
eth
eth
eth
efa
ult
fau
ltfa
ult
fau
ltd
uty
du
tyd
uty
du
tyco
uld
cou
ldco
uld
cou
ldb
eb
eb
eb
e7
07
07
07
0k
ilo
kil
ok
ilo
kil
o- ---a
mp
ere
sa
mp
ere
sa
mp
ere
sa
mp
ere
s. ...In InInIn
lik
eli
ke
lik
eli
ke
ma
nn
er
ma
nn
er
ma
nn
er
ma
nn
er
tha
tth
at
tha
tth
at
a aaa1
00
10
01
00
10
0K
VA
KV
AK
VA
KV
Ath
ree
thre
eth
ree
thre
e- ---p
ha
sep
ha
sep
ha
sep
ha
setr
an
sfo
rme
rtr
an
sfo
rme
rtr
an
sfo
rme
rtr
an
sfo
rme
rd
eli
ve
rsd
eli
ve
rsd
eli
ve
rsd
eli
ve
rsa aaa
thre
eth
ree
thre
eth
ree
- ---ph
ase
ph
ase
ph
ase
ph
ase
sho
rtsh
ort
sho
rtsh
ort
circ
uit
circ
uit
circ
uit
circ
uit
curr
en
tcu
rre
nt
curr
en
tcu
rre
nt
at
at
at
at
12
12
12
12
. ...0 000k
ilo
kil
ok
ilo
kil
o- ---a
mp
ere
sa
mp
ere
sa
mp
ere
sa
mp
ere
s. ...
Ca
reC
are
Ca
reC
are
ho
we
ve
rh
ow
ev
er
ho
we
ve
rh
ow
ev
er
on
on
on
on
the
the
the
the
use
use
use
use
of
of
of
of
min
iatu
rem
inia
ture
min
iatu
rem
inia
ture
cb’s
cb’s
cb’s
cb’s
be
cau
seb
eca
use
be
cau
seb
eca
use
the
yth
ey
the
yth
ey
ha
ve
ha
ve
ha
ve
ha
ve
rela
tiv
ely
rela
tiv
ely
rela
tiv
ely
rela
tiv
ely
low
low
low
low
sho
rtsh
ort
sho
rtsh
ort
circ
uit
circ
uit
circ
uit
circ
uit
cap
aci
tie
sca
pa
citi
es
cap
aci
tie
sca
pa
citi
es. ...
Alt
ho
ug
hA
lth
ou
gh
Alt
ho
ug
hA
lth
ou
gh
mo
de
lsm
od
els
mo
de
lsm
od
els
are
are
are
are
av
ail
ab
lea
va
ila
ble
av
ail
ab
lea
va
ila
ble
wit
hw
ith
wit
hw
ith
rati
ng
sra
tin
gs
rati
ng
sra
tin
gs
up
up
up
up
to tototo1
61
61
61
6K
A,
KA
,K
A,
KA
,m
ajo
rity
ma
jori
tym
ajo
rity
ma
jori
tyo
fo
fo
fo
fm
cb’s
mcb
’sm
cb’s
mcb
’so
nly
on
lyo
nly
on
lyh
av
eh
av
eh
av
eh
av
ea aaa
ma
xim
um
ma
xim
um
ma
xim
um
ma
xim
um
bre
ak
ing
bre
ak
ing
bre
ak
ing
bre
ak
ing
cap
aci
tyca
pa
city
cap
aci
tyca
pa
city
of
of
of
of
9 999K
AK
AK
AK
A. ...
In InInInth
isth
isth
isth
isca
se,
case
,ca
se,
case
,it ititit
ha
sh
as
ha
sh
as
to tototob
eb
eb
eb
ere
me
mb
ere
dre
me
mb
ere
dre
me
mb
ere
dre
me
mb
ere
dis isisis
tha
tth
at
tha
tth
at
the
the
the
the
use
use
use
use
mcb
’sm
cb’s
mcb
’sm
cb’s
are
are
are
are
lim
ite
dli
mit
ed
lim
ite
dli
mit
ed
on
lyo
nly
on
lyo
nly
if ifififth
eth
eth
eth
e
9393
sou
rce
sou
rce
sou
rce
sou
rce
tra
nsf
orm
er
tra
nsf
orm
er
tra
nsf
orm
er
tra
nsf
orm
er
are
are
are
are
sma
llsm
all
sma
llsm
all
en
ou
gh
en
ou
gh
en
ou
gh
en
ou
gh
. ...
Fo
rF
or
Fo
rF
or
sou
rce
sou
rce
sou
rce
sou
rce
tra
nsf
orm
ers
tra
nsf
orm
ers
tra
nsf
orm
ers
tra
nsf
orm
ers
tha
tth
at
tha
tth
at
are
are
are
are
larg
ela
rge
larg
ela
rge
wh
ere
wh
ere
wh
ere
wh
ere
sho
rtsh
ort
sho
rtsh
ort
circ
uit
circ
uit
circ
uit
circ
uit
lev
els
lev
els
lev
els
lev
els
are
are
are
are
hig
he
r,h
igh
er,
hig
he
r,h
igh
er,
mo
lded
mo
lded
mo
lded
mo
lded
case
case
case
case
circ
uit
circ
uit
circ
uit
circ
uit
bre
aker
sb
reak
ers
bre
aker
sb
reak
ers
(MC
CB
’s)
(MC
CB
’s)
(MC
CB
’s)
(MC
CB
’s)
are
are
are
are
av
ail
ab
lea
va
ila
ble
av
ail
ab
lea
va
ila
ble
. ...
In InInIna
ny
an
ya
ny
an
yca
se,
case
,ca
se,
case
,F
au
ltF
au
ltF
au
ltF
au
ltC
alc
ula
tio
ns
Ca
lcu
lati
on
sC
alc
ula
tio
ns
Ca
lcu
lati
on
sa
rea
rea
rea
ren
ece
ssa
ryn
ece
ssa
ryn
ece
ssa
ryn
ece
ssa
ry. ...
AL
TH
OU
GH
FA
UL
T C
AL
CU
LA
TIO
N I
S A
LT
HO
UG
H F
AU
LT
CA
LC
UL
AT
ION
IS
AL
TH
OU
GH
FA
UL
T C
AL
CU
LA
TIO
N I
S A
LT
HO
UG
H F
AU
LT
CA
LC
UL
AT
ION
IS
NO
T W
ITH
IN T
HE
SC
OP
E O
F T
HIS
N
OT
WIT
HIN
TH
E S
CO
PE
OF
TH
IS
NO
T W
ITH
IN T
HE
SC
OP
E O
F T
HIS
N
OT
WIT
HIN
TH
E S
CO
PE
OF
TH
IS
MO
DU
LE
, M
OD
UL
E,
MO
DU
LE
, M
OD
UL
E,
IT I
S B
EST
TO
SH
OW
TH
E E
FF
EC
TS
IT I
S B
EST
TO
SH
OW
TH
E E
FF
EC
TS
IT I
S B
EST
TO
SH
OW
TH
E E
FF
EC
TS
IT I
S B
EST
TO
SH
OW
TH
E E
FF
EC
TS
OF
UN
DE
RR
AT
ED
CIR
CU
ITO
FU
ND
ER
RA
TE
DC
IRC
UIT
OF
UN
DE
RR
AT
ED
CIR
CU
ITO
FU
ND
ER
RA
TE
DC
IRC
UIT
9494
OF
UN
DE
RR
AT
ED
CIR
CU
IT
OF
UN
DE
RR
AT
ED
CIR
CU
IT
OF
UN
DE
RR
AT
ED
CIR
CU
IT
OF
UN
DE
RR
AT
ED
CIR
CU
IT
BR
EA
KE
RS
IN T
HE
CO
NT
EX
T O
F
BR
EA
KE
RS
IN T
HE
CO
NT
EX
T O
F
BR
EA
KE
RS
IN T
HE
CO
NT
EX
T O
F
BR
EA
KE
RS
IN T
HE
CO
NT
EX
T O
F
TH
EIR
INT
ER
RU
PT
ING
T
HE
IR IN
TE
RR
UP
TIN
G
TH
EIR
INT
ER
RU
PT
ING
T
HE
IR IN
TE
RR
UP
TIN
G
CA
PA
CIT
IES…
!C
AP
AC
ITIE
S…!
CA
PA
CIT
IES…
!C
AP
AC
ITIE
S…!
INTE
RR
UP
TIN
G
RA
TIN
GS
FO
R O
CP
D’s
Wha
tis
KA
ICal
labo
ut?
Eac
hci
rcui
tbr
eake
rha
sth
ree
mos
tim
port
ant
rati
ngs
–a
cont
inuo
uscu
rren
tra
ting
,a
volt
age
rati
ngan
dan
inte
rrup
ting
capa
city
(IC
)ra
ting
.
The
ICra
ting
isth
em
axim
umam
ount
A 3
.6 K
V M
INIM
UM
OIL
C
RC
UIT
BR
EA
KE
R B
EFO
RE
A
9595
ofcu
rren
tth
atth
ede
vice
will
open
safe
lyto
relie
vea
faul
tco
ndit
ion
-w
itho
utin
juri
ngit
self.
The
‘inju
ry’m
eans
the
cond
itio
nw
here
afte
rin
terr
upti
nga
faul
t,th
ebr
eake
rce
ased
tobe
oper
able
-or
wor
se,
the
brea
ker
disi
nteg
rate
dbe
caus
eth
efa
ult
curr
ent
isto
om
uch
for
the
brea
ker
toha
ndle
.
FAU
LT
TH
E C
RC
UIT
BR
EA
KE
R
AFT
ER
A F
AU
LT
INTE
RR
UP
TIN
G
RA
TIN
GS
FO
R O
CP
D’s
9696
Wha
tis
KA
ICal
labo
ut?
The
ICra
ting
isth
em
axim
umam
ount
ofcu
rren
tth
atth
ede
vice
will
open
safe
lyto
relie
vea
faul
tco
nditi
on-
wit
hout
inju
ring
itse
lf.
The
‘inju
ry’m
eans
the
cond
ition
whe
reaf
ter
inte
rrup
ting
afa
ult,
the
brea
ker
ceas
edto
beop
erab
le-
orw
orse
,th
ebr
eake
rdi
sint
egra
ted
beca
use
the
faul
tcu
rren
tis
too
muc
hfo
rth
ebr
eake
rto
hand
le.
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
9797
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
9898
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
9999
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
100
100
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
101
101
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
102
102
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
103
103
INTERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
IN
TERRU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
FO
R O
CP
D’s
104
104
INTER
RU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
Th
ere
fore
,T
he
refo
re,
Th
ere
fore
,T
he
refo
re,
it itititis isisis
no
tn
ot
no
tn
ot
en
ou
gh
en
ou
gh
en
ou
gh
en
ou
gh
to tototosp
eci
fysp
eci
fysp
eci
fysp
eci
fyth
eth
eth
eth
eC
on
tin
uo
us
Co
nti
nu
ou
sC
on
tin
uo
us
Co
nti
nu
ou
sC
urr
en
tC
urr
en
tC
urr
en
tC
urr
en
tR
ati
ng
Ra
tin
gR
ati
ng
Ra
tin
ga
nd
an
da
nd
an
dV
olt
ag
eV
olt
ag
eV
olt
ag
eV
olt
ag
eR
ati
ng
Ra
tin
gR
ati
ng
Ra
tin
go
fo
fo
fo
fth
eth
eth
eth
eb
rea
ke
rb
rea
ke
rb
rea
ke
rb
rea
ke
rb
ut
bu
tb
ut
bu
tm
ost
mo
stm
ost
mo
stim
po
rta
ntl
y,
imp
ort
an
tly
,im
po
rta
ntl
y,
imp
ort
an
tly
,th
eth
eth
eth
ee
ng
ine
er
en
gin
ee
re
ng
ine
er
en
gin
ee
rm
ust
mu
stm
ust
mu
stsp
eci
fysp
eci
fysp
eci
fysp
eci
fyth
eth
eth
eth
eK
AIC
KA
ICK
AIC
KA
ICra
tin
gs
rati
ng
sra
tin
gs
rati
ng
so
fo
fo
fo
fth
ese
the
seth
ese
the
sep
rote
ctiv
ep
rote
ctiv
ep
rote
ctiv
ep
rote
ctiv
ed
ev
ice
sd
ev
ice
sd
ev
ice
sd
ev
ice
s
105
105
the
seth
ese
the
seth
ese
pro
tect
ive
pro
tect
ive
pro
tect
ive
pro
tect
ive
de
vic
es
de
vic
es
de
vic
es
de
vic
es. ...
Th
isT
his
Th
isT
his
do
es
do
es
do
es
do
es
no
tn
ot
no
tn
ot
on
lyo
nly
on
lyo
nly
cov
er
cov
er
cov
er
cov
er
the
the
the
the
larg
ela
rge
larg
ela
rge
bre
ak
ers
bre
ak
ers
bre
ak
ers
bre
ak
ers
bu
tb
ut
bu
tb
ut
mu
stm
ust
mu
stm
ust
tra
nsc
en
dtr
an
sce
nd
tra
nsc
en
dtr
an
sce
nd
to tototoa
lla
lla
lla
llb
rea
ke
rsb
rea
ke
rsb
rea
ke
rsb
rea
ke
rsin
clu
din
gin
clu
din
gin
clu
din
gin
clu
din
gth
eth
eth
eth
esm
all
est
sma
lle
stsm
all
est
sma
lle
stb
ran
chb
ran
chb
ran
chb
ran
chci
rcu
its
circ
uit
sci
rcu
its
circ
uit
sa
ta
ta
ta
tth
eth
eth
eth
ee
nd
en
de
nd
en
dp
oin
tsp
oin
tsp
oin
tsp
oin
tso
fo
fo
fo
fth
eth
eth
eth
esy
ste
msy
ste
msy
ste
msy
ste
m. ...
INTER
RU
PTIN
G R
ATIN
GS
FO
R O
CP
D’s
LV P
ow
er
Cir
cuit
Bre
akers
106
106
�L
V P
CB
’s a
re
LV
PC
B’s
are
L
V P
CB
’s a
re
LV
PC
B’s
are
re
com
me
nd
ed
fo
r m
ain
s &
re
com
me
nd
ed
fo
r m
ain
s &
re
com
me
nd
ed
fo
r m
ain
s &
re
com
me
nd
ed
fo
r m
ain
s &
d
istr
ibu
tio
n f
ee
de
r d
istr
ibu
tio
n f
ee
de
r d
istr
ibu
tio
n f
ee
de
r d
istr
ibu
tio
n f
ee
de
r a
pp
lica
tio
ns
fro
m 8
00
A t
o
ap
pli
cati
on
s fr
om
80
0 A
to
a
pp
lica
tio
ns
fro
m 8
00
A t
o
ap
pli
cati
on
s fr
om
80
0 A
to
6
,30
0 A
.6
,30
0 A
.6
,30
0 A
.6
,30
0 A
.
�M
old
ed
Ca
se C
ircu
it
Mo
lde
d C
ase
Cir
cuit
M
old
ed
Ca
se C
ircu
it
Mo
lde
d C
ase
Cir
cuit
B
rea
ke
rs c
an
re
ach
up
to
B
rea
ke
rs c
an
re
ach
up
to
B
rea
ke
rs c
an
re
ach
up
to
B
rea
ke
rs c
an
re
ach
up
to
4
,00
0 A
ra
tin
g b
ut
go
od
4
,00
0 A
ra
tin
g b
ut
go
od
4
,00
0 A
ra
tin
g b
ut
go
od
4
,00
0 A
ra
tin
g b
ut
go
od
o
nly
fo
r tw
o in
terr
up
tio
ns
on
ly f
or
two
inte
rru
pti
on
s o
nly
fo
r tw
o in
terr
up
tio
ns
on
ly f
or
two
inte
rru
pti
on
s o
nly
.o
nly
.o
nly
.o
nly
.
107
107
108
108
109
109
110
110
111
111
112
112
113
113
AT
TH
IS T
IME
,A
T T
HIS
TIM
E,
AT
TH
IS T
IME
,A
T T
HIS
TIM
E,
IS S
IZIN
G O
F S
AF
EIS
SIZ
ING
OF
SA
FE
IS S
IZIN
G O
F S
AF
EIS
SIZ
ING
OF
SA
FE
CIR
CU
ITS
FIN
ISH
ED
?C
IRC
UIT
SF
INIS
HE
D?
CIR
CU
ITS
FIN
ISH
ED
?C
IRC
UIT
SF
INIS
HE
D?
114
114
CIR
CU
ITS
FIN
ISH
ED
…?
CIR
CU
ITS
FIN
ISH
ED
…?
CIR
CU
ITS
FIN
ISH
ED
…?
CIR
CU
ITS
FIN
ISH
ED
…?
NO
T Q
UIT
E…
!
115
115
Beca
use,
DE
SIG
NIN
G C
IRC
UIT
S D
ESI
GN
ING
CIR
CU
ITS
DE
SIG
NIN
G C
IRC
UIT
S D
ESI
GN
ING
CIR
CU
ITS
Mu
st C
on
sid
er
Mu
st C
on
sid
er
Mu
st C
on
sid
er
Mu
st C
on
sid
er
CO
ND
UC
TO
R D
AM
AG
E
CO
ND
UC
TO
R D
AM
AG
E
CO
ND
UC
TO
R D
AM
AG
E
CO
ND
UC
TO
R D
AM
AG
E
DU
RIN
G F
AU
LT
S!D
UR
ING
FA
UL
TS!
DU
RIN
G F
AU
LT
S!D
UR
ING
FA
UL
TS!
116
116
How
com
e w
hen
Circu
it
How
com
e w
hen
Circu
it
How
com
e w
hen
Circu
it
How
com
e w
hen
Circu
it
Bre
aker
s are
the
re…?
Bre
aker
s are
the
re…?
Bre
aker
s are
the
re…?
Bre
aker
s are
the
re…?
Ove
rcur
rent
Ove
rcur
rent
Ove
rcur
rent
Ove
rcur
rent
pro
tect
ion
pro
tect
ion
pro
tect
ion
pro
tect
ion
is isisisto tototo
open
open
open
open
a aaacirc
uit
circ
uit
circ
uit
circ
uit
bef
ore
bef
ore
bef
ore
bef
ore
cond
ucto
rsco
nduc
tors
cond
ucto
rsco
nduc
tors
are
are
are
are
dam
aged
dam
aged
dam
aged
dam
aged
whe
nw
hen
whe
nw
hen
an
an
an
an
ove
rcur
rent
ove
rcur
rent
ove
rcur
rent
ove
rcur
rent
cond
itio
nco
nditio
nco
nditio
nco
nditio
nex
ists
exis
tsex
ists
exis
ts. ...
Di
Di
Di
Di
ht
ht
ht
ht
iit
iit
iit
iit
t tttt ttt
th ththth
DES
IGN
ING
CIR
CU
ITS
FR
OM
CO
ND
UC
TO
R D
AM
AG
E
117
117
Dur
ing
Dur
ing
Dur
ing
Dur
ing
short
short
short
short
circ
uits
,circ
uits
,circ
uits
,c irc
uits
,cu
rren
tscu
rren
tscu
rren
tscu
rren
tsto tototo
the
the
the
the
cond
ucto
rsco
nduc
tors
cond
ucto
rsco
nduc
tors
are
are
are
are
trem
endous
lytrem
endous
lytrem
endous
lytrem
endous
lyhi
gh
hig
hhig
hhi
gh
that
that
that
that
it itititm
ust
mus
tm
ust
mus
tbe
be
be
be
rem
ove
dre
move
dre
move
dre
move
dqui
ckly
qui
ckly
qui
ckly
qui
ckly
bef
ore
bef
ore
bef
ore
bef
ore
the
the
the
the
dam
age
dam
age
dam
age
dam
age
poin
tpoin
tpoin
tpoin
tof
of
of
of
cond
ucto
rco
nduc
tor
cond
ucto
rco
nduc
torin
sula
tion
insu
lation
insu
lation
insu
lation
is isisisre
ach
edre
ach
edre
ach
edre
ach
ed. ...
Ass
um
ing
th
at
the
OC
PD
’s h
as
Ass
um
ing
th
at
the
OC
PD
’s h
as
Ass
um
ing
th
at
the
OC
PD
’s h
as
Ass
um
ing
th
at
the
OC
PD
’s h
as
suff
icie
nt
inte
rru
pti
ng
ca
pa
citi
es;
th
ere
su
ffic
ien
t in
terr
up
tin
g c
ap
aci
tie
s; t
he
re
suff
icie
nt
inte
rru
pti
ng
ca
pa
citi
es;
th
ere
su
ffic
ien
t in
terr
up
tin
g c
ap
aci
tie
s; t
he
re
are
sti
ll t
wo
act
ion
s o
f th
e O
CP
D’s
th
at
are
sti
ll t
wo
act
ion
s o
f th
e O
CP
D’s
th
at
are
sti
ll t
wo
act
ion
s o
f th
e O
CP
D’s
th
at
are
sti
ll t
wo
act
ion
s o
f th
e O
CP
D’s
th
at
are
imp
ort
an
t in
pro
tect
ing
cir
cuit
a
re im
po
rta
nt
in p
rote
ctin
g c
ircu
it
are
imp
ort
an
t in
pro
tect
ing
cir
cuit
a
re im
po
rta
nt
in p
rote
ctin
g c
ircu
it
wir
es
& c
ab
les.
w
ire
s &
ca
ble
s.
wir
es
& c
ab
les.
w
ire
s &
ca
ble
s.
DES
IGN
ING
CIR
CU
ITS
FR
OM
CO
ND
UC
TO
R D
AM
AG
E
118
118
a) a)a)
a)th
e s
pe
ed
of
the
cle
ari
ng
,th
e s
pe
ed
of
the
cle
ari
ng
,th
e s
pe
ed
of
the
cle
ari
ng
,th
e s
pe
ed
of
the
cle
ari
ng
,
b)
b)
b)
b)
ho
w m
uch
h
ow
mu
ch
ho
w m
uch
h
ow
mu
ch ‘l
et
‘let
‘let
‘let- ---
thro
ug
h’
thro
ug
h’
thro
ug
h’
thro
ug
h’c
urr
en
t it
cu
rre
nt
it
curr
en
t it
cu
rre
nt
it
all
ow
s to
flo
w in
to t
he
co
nd
uct
or.
all
ow
s to
flo
w in
to t
he
co
nd
uct
or.
all
ow
s to
flo
w in
to t
he
co
nd
uct
or.
all
ow
s to
flo
w in
to t
he
co
nd
uct
or.
Alt
ho
ug
h c
on
du
cto
rs d
o h
av
e a
llo
wa
ble
A
lth
ou
gh
co
nd
uct
ors
do
ha
ve
all
ow
ab
le
Alt
ho
ug
h c
on
du
cto
rs d
o h
av
e a
llo
wa
ble
A
lth
ou
gh
co
nd
uct
ors
do
ha
ve
all
ow
ab
le
am
pa
city
ra
tin
gs,
th
ey
als
o h
av
e m
ax
imu
m
am
pa
city
ra
tin
gs,
th
ey
als
o h
av
e m
ax
imu
m
am
pa
city
ra
tin
gs,
th
ey
als
o h
av
e m
ax
imu
m
am
pa
city
ra
tin
gs,
th
ey
als
o h
av
e m
ax
imu
m
all
ow
ab
le
all
ow
ab
le
all
ow
ab
le
all
ow
ab
le s
ho
rtsh
ort
sho
rtsh
ort
- ---cir
cuit
cu
rre
nt
wit
hst
an
d
circ
uit
cu
rre
nt
wit
hst
an
d
circ
uit
cu
rre
nt
wit
hst
an
d
circ
uit
cu
rre
nt
wit
hst
an
d
rati
ng
sra
tin
gs
rati
ng
sra
tin
gs. ...D
ES
IGN
ING
CIR
CU
ITS
FR
OM
CO
ND
UC
TO
R D
AM
AG
E
119
119
Da
ma
ge
ra
ng
ing
fro
m
Da
ma
ge
ra
ng
ing
fro
m
Da
ma
ge
ra
ng
ing
fro
m
Da
ma
ge
ra
ng
ing
fro
m s
lig
ht
de
gra
da
tio
n o
f sl
igh
t d
eg
rad
ati
on
of
slig
ht
de
gra
da
tio
n o
f sl
igh
t d
eg
rad
ati
on
of
insu
lati
on
to
vio
len
t v
ap
ori
zati
on
of
the
in
sula
tio
n t
o v
iole
nt
va
po
riza
tio
n o
f th
e
insu
lati
on
to
vio
len
t v
ap
ori
zati
on
of
the
in
sula
tio
n t
o v
iole
nt
va
po
riza
tio
n o
f th
e
con
du
cto
rco
nd
uct
or
con
du
cto
rco
nd
uct
or
can
re
sult
if t
he
sh
ort
can
re
sult
if t
he
sh
ort
can
re
sult
if t
he
sh
ort
can
re
sult
if t
he
sh
ort
- ---cir
cuit
ci
rcu
it
circ
uit
ci
rcu
it
wit
hst
an
d is
ex
cee
de
d.
wit
hst
an
d is
ex
cee
de
d.
wit
hst
an
d is
ex
cee
de
d.
wit
hst
an
d is
ex
cee
de
d.
DES
IGN
ING
CIR
CU
ITS
FR
OM
C
ON
DU
CTO
R D
AM
AG
E
120
120
DES
IGN
ING
CIR
CU
ITS
FR
OM
C
ON
DU
CTO
R D
AM
AG
E
121
121
Cu
rren
tC
urre
nt--l
imit
ing
Cir
cuit
lim
itin
g C
ircu
it
Bea
ker
Bea
ker
The
The
II22tt
asso
ciat
edas
soci
ated
wit
hw
ith
the
the
asym
met
rica
las
ymm
etri
cal
curr
ent
curr
ent
isisre
quir
edre
quir
edtoto
bebere
duce
dre
duce
dtoto
the
the
equ
ival
ent
equ
ival
ent
II22tt
ofofaa
sym
met
rica
lsy
mm
etri
cal
curr
ent
curr
ent
ororle
ssle
ss
122
122
Beh
avio
r of
a T
ypic
al C
urre
nt
Lim
itin
g Fu
se
123
123
Ca
seC
ase
Ca
seC
ase
1 111: :::
A AAA# ###
10
10
10
10
AW
GA
WG
AW
GA
WG
con
du
cto
rco
nd
uct
or
con
du
cto
rco
nd
uct
or
can
can
can
can
on
lyo
nly
on
lyo
nly
wit
hst
an
dw
ith
sta
nd
wit
hst
an
dw
ith
sta
nd
4 444, ,,,3
00
30
03
00
30
0a
mp
ere
sa
mp
ere
sa
mp
ere
sa
mp
ere
sfo
rfo
rfo
rfo
ro
ne
on
eo
ne
on
ecy
cle
cycl
ecy
cle
cycl
ea
nd
an
da
nd
an
d6 666
, ,,,02
00
20
02
00
20
am
pe
res
am
pe
res
am
pe
res
am
pe
res
for
for
for
for
on
eo
ne
on
eo
ne
- ---ha
lfh
alf
ha
lfh
alf
cycl
ecy
cle
cycl
ecy
cle
. ...In InInIn
the
the
the
the
circ
uit
circ
uit
circ
uit
circ
uit
be
low
,b
elo
w,
be
low
,b
elo
w,
is isisisth
eth
eth
eth
ew
ire
wir
ew
ire
wir
ep
rote
cte
dp
rote
cte
dp
rote
cte
dp
rote
cte
dw
he
nw
he
nw
he
nw
he
nth
eth
eth
eth
ea
va
ila
ble
av
ail
ab
lea
va
ila
ble
av
ail
ab
lesh
ort
sho
rtsh
ort
sho
rt- ---c
ircu
itci
rcu
itci
rcu
itci
rcu
itcu
rre
nt
curr
en
tcu
rre
nt
curr
en
to
fo
fo
fo
f4
04
04
04
0, ,,,0
00
00
00
00
00
0e
xce
ed
se
xce
ed
se
xce
ed
se
xce
ed
sth
eth
eth
eth
ew
ire
wir
ew
ire
wir
ew
ith
sta
nd
?w
ith
sta
nd
?w
ith
sta
nd
?w
ith
sta
nd
?
40 K
A1.
85 K
A
124
124
Un
de
r sh
ort
Un
de
r sh
ort
Un
de
r sh
ort
Un
de
r sh
ort
- ---cir
cuit
s, t
he
LO
Wci
rcu
its,
th
e L
OW
circ
uit
s, t
he
LO
Wci
rcu
its,
th
e L
OW
- ---PE
AK
® Y
EL
LO
W™
Du
al
PE
AK
® Y
EL
LO
W™
Du
al
PE
AK
® Y
EL
LO
W™
Du
al
PE
AK
® Y
EL
LO
W™
Du
al- ---
Ele
me
nt
fuse
(3
0
Ele
me
nt
fuse
(3
0
Ele
me
nt
fuse
(3
0
Ele
me
nt
fuse
(3
0
am
pe
re C
LF
) is
fa
st a
ctin
g. I
t w
ill c
lea
r &
lim
it s
ho
rt c
ircu
it c
urr
en
t b
efo
re
am
pe
re C
LF
) is
fa
st a
ctin
g. I
t w
ill c
lea
r &
lim
it s
ho
rt c
ircu
it c
urr
en
t b
efo
re
am
pe
re C
LF
) is
fa
st a
ctin
g. I
t w
ill c
lea
r &
lim
it s
ho
rt c
ircu
it c
urr
en
t b
efo
re
am
pe
re C
LF
) is
fa
st a
ctin
g. I
t w
ill c
lea
r &
lim
it s
ho
rt c
ircu
it c
urr
en
t b
efo
re
it c
an
bu
ild
up
to
a le
ve
l hig
he
r th
an
th
e w
ire
wit
hst
an
d. T
he
op
en
ing
it
ca
n b
uil
d u
p t
o a
lev
el h
igh
er
tha
n t
he
wir
e w
ith
sta
nd
. Th
e o
pe
nin
g
it c
an
bu
ild
up
to
a le
ve
l hig
he
r th
an
th
e w
ire
wit
hst
an
d. T
he
op
en
ing
it
ca
n b
uil
d u
p t
o a
lev
el h
igh
er
tha
n t
he
wir
e w
ith
sta
nd
. Th
e o
pe
nin
g
tim
e o
f th
e f
use
is le
ss t
ha
n o
ne
tim
e o
f th
e f
use
is le
ss t
ha
n o
ne
tim
e o
f th
e f
use
is le
ss t
ha
n o
ne
tim
e o
f th
e f
use
is le
ss t
ha
n o
ne
- ---ha
lf c
ycl
e (
less
th
an
0.0
08
se
con
ds)
. In
h
alf
cy
cle
(le
ss t
ha
n 0
.00
8 s
eco
nd
s). I
n
ha
lf c
ycl
e (
less
th
an
0.0
08
se
con
ds)
. In
h
alf
cy
cle
(le
ss t
ha
n 0
.00
8 s
eco
nd
s). I
n
this
pa
rtic
ula
r e
xa
mp
le, t
he
pro
spe
ctiv
e c
urr
en
t le
tth
is p
art
icu
lar
ex
am
ple
, th
e p
rosp
ect
ive
cu
rre
nt
let
this
pa
rtic
ula
r e
xa
mp
le, t
he
pro
spe
ctiv
e c
urr
en
t le
tth
is p
art
icu
lar
ex
am
ple
, th
e p
rosp
ect
ive
cu
rre
nt
let- ---
thru
by
th
e f
use
is le
ss
thru
by
th
e f
use
is le
ss
thru
by
th
e f
use
is le
ss
thru
by
th
e f
use
is le
ss
tha
n 1
,85
0 a
mp
ere
s.
tha
n 1
,85
0 a
mp
ere
s.
tha
n 1
,85
0 a
mp
ere
s.
tha
n 1
,85
0 a
mp
ere
s.
Th
us
the
ab
ov
e e
xa
mp
le is
sa
fe. O
pe
nin
g t
ime
& c
urr
en
t le
tT
hu
s th
e a
bo
ve
ex
am
ple
is s
afe
. Op
en
ing
tim
e &
cu
rre
nt
let
Th
us
the
ab
ov
e e
xa
mp
le is
sa
fe. O
pe
nin
g t
ime
& c
urr
en
t le
tT
hu
s th
e a
bo
ve
ex
am
ple
is s
afe
. Op
en
ing
tim
e &
cu
rre
nt
let- ---
thro
ug
h o
f th
rou
gh
of
thro
ug
h o
f th
rou
gh
of
the
fu
se is
fa
r lo
we
r th
an
th
e w
ire
wit
hst
an
d r
ati
ng
. Co
nd
uct
or
the
fu
se is
fa
r lo
we
r th
an
th
e w
ire
wit
hst
an
d r
ati
ng
. Co
nd
uct
or
the
fu
se is
fa
r lo
we
r th
an
th
e w
ire
wit
hst
an
d r
ati
ng
. Co
nd
uct
or
the
fu
se is
fa
r lo
we
r th
an
th
e w
ire
wit
hst
an
d r
ati
ng
. Co
nd
uct
or
pro
tect
ion
is n
ot
a p
rob
lem
wh
en
th
e c
on
du
cto
r is
pro
tect
ed
by
cu
rre
nt
pro
tect
ion
is n
ot
a p
rob
lem
wh
en
th
e c
on
du
cto
r is
pro
tect
ed
by
cu
rre
nt
pro
tect
ion
is n
ot
a p
rob
lem
wh
en
th
e c
on
du
cto
r is
pro
tect
ed
by
cu
rre
nt
pro
tect
ion
is n
ot
a p
rob
lem
wh
en
th
e c
on
du
cto
r is
pro
tect
ed
by
cu
rre
nt- ---
lim
itin
g f
use
s w
hic
h h
av
e a
n a
mp
ere
ra
tin
g t
ha
t is
th
e s
am
e a
s th
e
lim
itin
g f
use
s w
hic
h h
av
e a
n a
mp
ere
ra
tin
g t
ha
t is
th
e s
am
e a
s th
e
lim
itin
g f
use
s w
hic
h h
av
e a
n a
mp
ere
ra
tin
g t
ha
t is
th
e s
am
e a
s th
e
lim
itin
g f
use
s w
hic
h h
av
e a
n a
mp
ere
ra
tin
g t
ha
t is
th
e s
am
e a
s th
e
con
du
cto
r co
nd
uct
or
con
du
cto
r co
nd
uct
or
am
pa
city
am
pa
city
am
pa
city
am
pa
city
rati
ng
.ra
tin
g.
rati
ng
.ra
tin
g.
Ca
seC
ase
Ca
seC
ase
2 222: :::
Do
es
Do
es
Do
es
Do
es
the
the
the
the
circ
uit
circ
uit
circ
uit
circ
uit
be
low
be
low
be
low
be
low
rep
rese
nt
rep
rese
nt
rep
rese
nt
rep
rese
nt
a aaam
isa
pp
lica
tio
n?
mis
ap
pli
cati
on
?m
isa
pp
lica
tio
n?
mis
ap
pli
cati
on
?( (((1
01
01
01
0A
WG
AW
GA
WG
AW
GT
HW
TH
WT
HW
TH
Win
sula
ted
insu
late
din
sula
ted
insu
late
dco
pp
er
cop
pe
rco
pp
er
cop
pe
rw
ire
wir
ew
ire
wir
eca
nca
nca
nca
nw
ith
sta
nd
wit
hst
an
dw
ith
sta
nd
wit
hst
an
d4 444
, ,,,30
03
00
30
03
00
am
pe
res
am
pe
res
am
pe
res
am
pe
res
for
for
for
for
on
eo
ne
on
eo
ne
cycl
ecy
cle
cycl
ecy
cle
an
da
nd
an
da
nd
6 666, ,,,0
20
02
00
20
02
0a
mp
ere
sa
mp
ere
sa
mp
ere
sa
mp
ere
sfo
rfo
rfo
rfo
ro
ne
on
eo
ne
on
e- ---h
alf
ha
lfh
alf
ha
lfcy
cle
)cy
cle
)cy
cle
)cy
cle
). ...
Yes
.The
40
KA
sho
rt-c
ircu
it c
urre
nt f
ar e
xcee
ds t
he w
iths
tand
of
the
# 1
0
40 K
A
125
125
THW
wir
e. T
he s
low
act
ing
ordi
nary
cir
cuit
bre
aker
(cl
eari
ng t
ime
of 1
cy
cle)
mak
es t
he c
ircu
it m
isap
plie
d.
Wh
at
can
be
do
ne
to
co
rre
ct t
he
ab
ov
e m
isa
pp
lica
tio
n?
Wh
at
can
be
do
ne
to
co
rre
ct t
he
ab
ov
e m
isa
pp
lica
tio
n?
Wh
at
can
be
do
ne
to
co
rre
ct t
he
ab
ov
e m
isa
pp
lica
tio
n?
Wh
at
can
be
do
ne
to
co
rre
ct t
he
ab
ov
e m
isa
pp
lica
tio
n?
1) U
se a
larg
er s
ize
cond
ucto
r (i
.e.,
from
# 1
0 to
# 1
/0 A
WG
),on
e w
ith
a w
iths
tand
rat
ing
grea
ter
than
the
sho
rt-c
ircu
it fo
r 1
cycl
e (S
ee C
hart
).
2) U
se a
n O
CP
D w
hich
is a
cur
rent
-lim
itin
g t
ype
(CLF
or
CLC
B)s
uch
as t
hat
show
n in
the
pre
viou
s ca
se.
126
126
127
127
RE
ME
MB
ER
GE
NT
LEM
EN
, A F
ULL
-BLO
WN
FIR
E
ON
LY N
EE
DS
AN
IG
NIT
ION
. AN
D I
GN
ITIO
N I
S,
YE
S –
IT’S
TH
E R
ES
PO
NS
IBIL
ITY
OF
TH
E
ELE
CT
RIC
AL
EN
GIN
EE
R.
SO
TH
EN
,
IN S
IZIN
G C
IRC
UIT
S &
FE
ED
ER
S, W
E
ALS
O N
EE
D T
O C
ON
SID
ER
TH
E S
IZE
O
F T
HE
SO
UR
CE
TR
AN
SFO
RM
ER
;
128
128
OT
HE
RW
ISE
, WH
AT
SH
OU
LD H
AV
E
BE
EN
A N
ICE
LY-D
ES
IGN
ED
CIR
CU
IT
AC
TU
ALL
Y T
UR
NS
OU
T T
O B
E
GR
OS
SLY
WR
ON
G &
FA
ULT
Y!
The
refo
re, c
ircu
it d
esig
ning
is
not
com
plet
e w
itho
ut f
ault
ca
lcul
atio
ns…
129
129
The
que
stio
n is
…:
‘AR
E W
E D
OIN
G I
T…
?’
END
…EN
D…
END
…EN
D…
130
THAN
K Y
OU
THAN
K Y
OU
THAN
K Y
OU
THAN
K Y
OU
THA
NK
YO
UT
HA
NK
YO
U