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7/24/2019 Section 9 Cables
1/14
SECTION 9
CABLES
MC 9
CP IN
7/24/2019 Section 9 Cables
2/14
J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/1
9.1 GENERAL
9.1.1 DESCRIPTION
The Sub-Contractor shall include for the
supply, installation and testing of all cables andaccessories specified herein and shown on the
Sub-Contract Drawings.
9.1.2 STANDARDS
All equipment, materials and workmanship
shall comply with the appropriate Singapore
or British Standards or an acceptable
equivalent international standard as well as
all local statutory obligations and regulations.
All aspects of the installation shall be in
accordance with the requirements of the
Singapore Standards Code of Practice CP 5:
1998 - Electrical Installation.
9.2 EQUIPMENT
9.2.1 PVC INSULATED CABLES
All PVC insulated cables shall consist of
annealed copper conductor complying with BS6004: 1995 - Specification for PVC-insulated
cables (non-armoured) for electrical power and
lighting unless indicated otherwise on the
Sub-Contract Drawings. The rated voltage of
the PVC cables shall be 600/1000 Volts.
The minimum cable size shall be 2.5mm2 for
lighting and 2.5mm2for small power or control
circuits.
Neutral conductors shall have black insulationand live or phase conductors, red, yellow or
blue insulation with phase identification
sleeves at each termination.
All cables shall pass Authority type tests and
batch tests or approved under Authoritys
quality certification scheme.
9.1 TNG QUT
9.1.1 M T
Nh thu scung cp, lp t v kim tra tt ccp
v linh kin c nu ra y v thc hintrn bn v.
9.1.2 TIU CHUN
Tt ctrang thit b, vt tv nhn cng sphi
tun theo tiu chun Singapore or British
Standards hay mt tiu chun quc t tng
ng cng nh tt c cc quy nh php l v
php lut ca nc sti.
Tt cphng php lp t phi ph hp vi tiu
chun ca Singapore Standards Code of Practice
CP 5: 1998 - Electrical Installation.
9.2 THIT B
9.2.1 CP BC CCH IN PVC.
Tt c cp bc PVC gm c dy dn ng c
theo tiu chun BS 6004: 1995 - Specification forPVC-insulated cables (non-armoured) for electrical
power and lightingngoi tr c chnh khc trn
bn v. Gi trin p cp phi l 600/1000 Volts.
Tit din cp nhnht l 2.5mm cho n v cho
cc mch iu khin hay thit bc cng sut nh.
Dy trung tnh sc cch in mu en v dy phac cch in mu , vng, xanh v c cbc mu
mi u cui phn bit pha.
Tt ccp phi qua kim tra ca cquan c thm
quyn v c chng nhn cht lng.
7/24/2019 Section 9 Cables
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/2
All PVC shall be flame-retardant.
9.2.2 FLEXIBLE CORDS
Flexible cords shall be 300V/500V grade to BS
6500: 1994 - Specification for insulated flexiblecords and cables. It shall be multi-stranded
copper conductors, high temperature, PVC
insulated with flame retardant white circular
PVC sheath.
The minimum size of conductor shall be
2.5mm2.
9.2.3 PVC INSULATED ARMOURED CABLES
(PVC/SWA/PVC)
PVC insulated, PVC sheathed, steel wire
armoured, PVC sheathed cables
(PVC/SWA/PVC), shall be 600V/1000V grade
to BS 6346: 1989 - Specification for PVC
insulated cables for electricity supply. It shall
stranded, shaped, copper conductor cores of
equal cross section and colour coded
insulation.
PVC insulated cores shall be sheathed with
flame retardant PVC which shall serve as abedding for galvanized single steel wire
armouring. The armouring shall be covered
with an outer flame retardant PVC sheath.
9.2.4 M.I.C.S. CABLES
All M.I.C.S. cables and cable accessories,
glands, etc. shall be 1000V grade to BS 6207:
1991 - Specification for mineral insulated
copper sheathed cables with copper
conductors and fittings to BS 6081: 1989 -Specification for terminations for mineral-
insulated cables suitable for heavy duty
industrial applications. All M.I.C.S. cable
fittings and accessories shall be manufactured
by the appropriate cable manufacturer and
only one make of cable shall be used.
Tt cPVC sl loi chy chm.
9.2.2 DY DN MM
Dy dn mm l loi 300V/500V theo BS 6500:
1994 - Specification for insulated flexible cords andcables. N l loi rut dy ng nhiu si, chu
nhit, cch in PVC vi v bc PVC bao quanh
mu trng chng chy.
Tit din nhnht l 2.5mm.
9.2.3 CP CCH IN PVC BC GIP
(PVC/SWA/PVC)
Cp cch in PVC, bc PVC, gip bc bng dy
thp, vPVC in p cch in 600V/1000V theo
tiu chun BS 6346: 1989 - Specification for PVC
insulated cables for electricity supply. L loi dy
dn ng nhiu si, c tit din v mu code cch
in tng ng.
Dy cch in PVC s c bc bng loi PVC
chng chy, c sdng nhmt lp nn bcnhng si thp mkm. Lp gip st s li c
bo vbng mt lp PVC chng chy bn ngoi.
9.2.4 CP CHNG NHIU M.I.C.S.
Tt ccp M.I.C.S. v phkin khc, np m, v.v
sl loi 1000V nhBS 6207: 1991 - Specification
for mineral insulated copper sheathed cables with
copper conductorsand fittings to BS 6081: 1989 -
Specification for terminations for mineral-insulated
cables thch hp cho nhng ngnh cng nghip
nng. Cc khp ni v ph kin khc phi c
lm bi nhng nh sn xut cp thch hp v ch
sdng ca cng mt nh sn xut.
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/3
9.2.5 FIRE RESISTANT CABLES
All fire resistant cables shall comply with BS
6387: 1994 - Specification for performance
requirements for cables required to maintain
circuit integrity under fire conditions.
They shall be single-core, unarmoured cables
rated at 450/750V, each comprising stranded,
circular annealed copper conductor, MICA
tape fire barrier, insulation of XLPE, EPR or
other special fire resistant compound with
continuous temperature rating of min. 850C
and an extruded oversheath of PVC in orange
or black colour.
The minimum size of each conductor shall be2.5mm2.
Fire resistant cable shall be strapped or tied to
the cable support system using stainless steel
cable ties or stainless steel strapping which
are tested and approved for use in fire
resistant wiring system.
All relevant test certificates of the cables shall
be submitted to the Engineer for approval prior
to ordering.
9.2.6 CROSS-LINKED POLYETHYLENE
INSULATED ARMOURED CABLES
(XLPE/SWA/PVC OR XLPE/AWA/PVC)
Cross-linked polyethylene insulated steel wired
armoured and PVC sheathed cables
(XPLE/SWA/PVC) shall comply to BS 5467:
1989 - Specification for cables with
thermosetting insulation for electricity supply
for rated voltage of up to and including
600/1000V and up to and including
1900/3300V with insulation grade to suit the
operating voltage and cores of equal cross
section.
Conductors shall be formed from high
conductivity full annealed stranded copper.
9.2.5 CP CHNG CHY
Tt c cp chng chy phi tun theo BS 6387:
1994 - Specification for performance requirements
for cables required to maintain circuit integrity under
fire conditions.
Chng l loi cp n, khng bc gip, gi trin
p 450/ 750V, mi si gm nhng dy dn bng
ng trn c ti luyn, dy bng MICA ngn la,
cch in loi XLPE, EPR hay loi ho cht c bit
chng chy c gi trnhit chu c thp nht
l 850C v c thm mt lp v bc p PVC mu
trng hay cam.
Tit din nhnht ca mi dy dn l 2.5mm2
.
Cp chng chy sc gihay buc cht vo h
thng khung bng nhng dy buc bng cable
ties hay dy bng bng thp khng r loi c
kim tra v cho php sdng trong h thng dy
chng chy.
Tt c nhng chng nhn kim tra lin quan n
cp phi c xem xt v ng bQun l K
thut trc khi c t hng.
9.2.6 CP BC GIP, CCH IN CROSS-LINKED
POLYETHYLENE (XLPE/SWA/PVC OR
XLPE/AWA/PVC)
Cp c vbc PVC, gip bng si thp, cch in
l Cross-linked polyethylene (XPLE/SWA/PVC) phi
tun theo BS 5467: 1989 - Specification for cables
with thermosetting insulation for electricity supply for
rated voltage of up to and including 600/1000V and
up to and including 1900/3300V c loi cch inph hp vi in p lm vic v rut c tit din
tng ng.
Dy dn phi c lm tdy ng c ti luyn
hon ton v c tnh dn in cao.
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/4
Conductor screening shall be non-metallic and
consist of either a semi-conducting tape or a
layer of extruded semi-conducting compound,
or a combination of the two.
Insulation shall consist of cross-linkedpolyethylene which is applied by extrusion to
form a compact homogeneous body.
Insulation screen shall consist of either a
semi-conducting compound or a combination
of the two. A metallic screen consisting of
either plain or tinned copper tape shall be
applied over the semi-conducting screen
except where rendered unnecessary by wire
armouring.
The cores of multi-core cables shall be laid up
with suitable fillers to form a compact circular
assembly. Multi-core cables shall have steel
galvanised wire (SWA) or galvanised steel
tape armour and single core cables shall have
aluminum wire armour (AWA) protection.
The bedding for multi-core wire armoured
cable shall consist of layers of
semi-conducting non-vulcanisable rubber-link
tape. Three core cable may be armoured withtwo layers of galvanized steel tapes with a
bedding of an extruded layer of heat resisting
PVC complying with BS 6746: 1990 -
Specification for PVC insulated and sheath of
electric cables.
9.3 INSTALLATION
9.3.1 GENERAL
The Sub-Contractor shall include for provision,installation, testing and commissioning of all
cables, conduits, trays, trunking and
accessories specified herein, shown on the
Sub-Contract Drawings and those items not
expressly specified but required to meet the
design intent of this Section.
Cables shall be enclosed in conduit or trunking
Lp mng bc dy dn sl loi phi kim loi v c
mt lp dy bng hay mt lp p hp cht bn dn,
hay kt hp chai.
Scch in gm c cross-linked polyethylene chtc ng dng to nn mt khi c ng cht.
Lp mng cch in gm c mt lp hp cht hay
kt hp c hai. Mt lp mng kim loi bng dy
bng ng trng thic hay trn sc bao quanh
lp mng bn dn ngoi trnhng chc yu
cu khng cn thit bng dy bc gip.
Rut ca cp nhiu si sc xp t bng mt
cht thch hp to nn mt khi trn c. Cp
nhiu rut sc dy thp mkm (SWA) hay bc
dy bng thp mkm v dy n sc bc dy
nhm bo v.
Lp cui ca dy cp nhiu rut bc gip gm c
cc lp dy dn mng bng bng cao su. Cp ba
rut c thc bc gip vi hai lp dy bng thp
mkm vi lp cui chu nhit bng PVC theo tiuchun BS 6746: 1990 Tiu chun k thut cho
cc cch in bng PVC v cp chng nhiu.
9.3 LP T
9.3.1 TNG QUT
Nh thu c nhim vcung cp, lp t, kim tra vthm nh tt c cp, ng dn, trunking, mng v
nhng ph kin c nu ra y v c th
hin trn bn vv nhng ci khng bt buc
tuyt i nhng yu cu phi ph hp nh thit
ktrong phn ny.
Cp dn phi i vo trong ng hay trunking ph hp
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/5
in accordance with CP 5: 1998 for capacities
of conduits and space factor for capacities of
trunking.
All wiring shall be carried out on the loop-in
system and the wires drawn into the conduitsafter the whole of the installation has been
completed.
Joints or connectors shall not be allowed in
wiring cables.
Exposed ends of conductors of 6mm2 and
above not filled with sockets shall be sweated
solid for connection to clamp terminals.
Cables which forms part of undergroundnetwork to be installed by the Sub-Contractor
and subsequent handover to either PowerGrid
or other relevant authorities shall comply with
the latest edition of PowerGrids Guideline &
Material Specification for Underground LT
Network in Housing & Industrial Estates
9.3.2 PVC INSULATED CABLES
Where PVC cables are indicated on the Sub-
Contract Drawings, the Sub-Contractor shallprovide all the necessary sleeves, trays,
conduits, supports and cable trunking, glands,
shrouds, end boxes, clamps, compounds
specialist tools, etc., necessary to install and
make off the cables in accordance with good
engineering practice and as hereunder
specified and shown on the Sub-Contract
Drawings.
All cables shall be provided with identification
labels at each end and at all positions wherecables change direction. In instances where
cables are multiple at 10m intervals. Labels
shall be manufactured from metal disc
engraved to show the size of the cable phase
and the equipment being fed.
Where multi-core cables are for indication,
protection and control applications, each core
vi yu cu CP 5: 1998cho slng cp trong ng
v hskhng gian ca trunking.
Tt cdy dn sc lp t theo htng mch
vng (loop-in) v dy dn c ko trong ng saukhi ton bslp t hon tt.
Dy dn khng c php c nhng chni hay
u ni.
u dy trn tit din t6mm trln khng c
lp trc tip vo cm m c kt ni qua mt b
u ni.
H thng mng cp ngm di t c lp tbi nh thu bn giao cho Li in Quc Gia
hay cquan hu quan phi tun theo qui tc lp
t Li in ngun phin bn mi nht Guideline
& Material Specification for Underground LT
Network in Housing & Industrial Estates
9.3.2 CP BC CCH IN PVC
Nhng chcp PVC thhin trn bn v, nh thu
slp t tt ccc mng, ng, thanh treo cp vtruking, hp ni, kp ng, tm m, nghchuyn
dng, v.v cn thit lp t v lm du cp ph
hp vi cng vic ca mt kslnh nghvnh
c nu ra y hay thhin trn bn v.
Tt ccp phi c nhn nhn dng ti mi u v
ti nhng chm cp i hng. Chng hn nhnhng ch cp c bi s cch khong l 10m.
Nhn dn sc lm ttm lim loi c khc in
su chknh thc ca cp, pha v thit bm
chng cp ngun ti.
Ch cp nhiu rut lp t hin th, bo v v
iu khin, mi si sc mt snhn din v c
7/24/2019 Section 9 Cables
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/6
shall have an identification number and
engraved ferrules over the cable tails. The
ferrules shall be numbered to correspond to a
wiring diagram agreed by the Engineer. All
wires shall be terminated with an acceptable
type of clamp connector. Pinching screw typeconnectors shall not be acceptable.
All cables shall be installed in accordance with
the CP 5: 1998, the cables being run between
their source and termination points installed on
cable trays, in ducts, clipped to ceilings and
wall or as otherwise specified on the
Sub-Contract Drawings.
Cables shall in general be supported by cable
ladders or perforated cable trays.
The cable ladder/ tray supports shall be
spaced at such intervals to ensure that the sag
shall be not more than 1/500 when installed
with cables, otherwise corrective measures
shall be carried out to the Engineer's
satisfaction.
Cables run horizontally, shall be properly
supported and cleated at intervals not
exceeding 2m directly to the cable ladder/ tray.Where cables are installed vertically, they shall
be cleated at distances not exceeding 1m.
Where cables are run in areas exposed to
weather, they shall be installed in hot-dipped
galvanised metal trunking.
The Sub-Contractor shall be responsible for
the off loading and handling of the cables on
site and shall ensure that cables are delivered
to site on drums and properly protectedagainst mechanical damage.
9.3.3 ARMOURED CABLES (PVC/SWA/PVC)
Cables shall be terminated in a gland fitted
with an armour clamp. The gland body shall be
provided with an internal conical sealing to
receive the armour clamping cone and a
vng kim loi khc s cui u cp. Chng s
c nh stng ng vi su dy c
s ng ca Qun l K thut. Tt c dy dn
phi c u ni bng mt loi u ct thch hp.
Khng c sdng loi u ni l c kp.
Cp sc lp t theo tiu chun CP 5: 1998,
cp chy gia ngun ca chng v im cui c
lp t trn mng, trong ng dn, kp trn trn,
tng hay nhng vtr khc c thhin trn bn
v.
Cp ni chung sc treo bng thang treo cp
hay mng treo c khot l.
Thanh treo mng/ thang st cch khong sao
cho vng khng qu 1/500 khi c mang cp,
ngc li sphi hiu chnh sao cho thomn vi
yu cu ca Qun l Kthut.
Cp t nm ngang sc treo mt cch thch
hp vi khong cch treo mng/ thang khng qu
2m. Ch cp t thng ng, chng sc ctcht vi khong cch khng qu 1m.
Nhng ch cp i ngoi tri, chng s c lp
trong trunking kim loi c mkm.
Nh thu c trch nhim bc dv qun l cp v
m bo rng chng c giao n ni phi cn
nguyn kin v c bo vcn thn trnh b
hng vckh.
9.3.3 CP BC GIP (PVC/SWA/PVC)
u cp sc lp vo mt tm m bng mt
ci kp st. Thn tm m sc mt ron hnh nn
gn ci kp st u cn v mt con b long, ci
m s bo v ci kp v ming lt st hnh nn.
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/7
clamping nut which shall secure the armour
clamping cone and conical armour seating. A
flame retardant PVC shroud shall be fitted to
cover the gland body.
Cable conductor terminations shall be bymeans of heavy-duty compression cable lugs.
The lugs shall be high conductivity copper
electro-tinned and applied to the conductor by
means of a hydraulic crimping tool or unless
otherwise specified.
Cables within cable ducts and draw pit
systems shall be installed by means of normal
hand running off the cable drum. It shall enter
the draw pit protected by roller guides and be
drawn through by hand. Cable winches shallnot be employed.
Unless agreed by the Engineer, straight
through joints in cables shall not be allowed.
The minimum bending radius shall be not less
than twelve times the overall cable diameter or
in accordance with the cable manufacturer's
recommendation.
Unless otherwise specified, all cable ducts anddraw pits shall be provided by the
Sub-Contractor.
9.3.4 M.I.C.S. CABLES
Cables shall be sealed immediately after
cutting. All cable shall give a minimum of
10Mwhen tested on a 1000 V D.C. Megger
immediately and 48 hours after sealing. The
Engineer reserves the right to test all cables
during installation and up to the end of themaintenance period. Any cables not giving a
satisfactory insulation level shall be resealed or
if considered necessary by the Engineer,
replaced by the Sub-Contractor to obtain a
satisfactory test reading.
Cables terminations at distribution boards,
switchgear and apparatus generally shall be
Mt lp PVC chng chy bao quanh bo vthn
tm m.
u ni cp s c lm bng u ct chu lccao. u ct l loi ng trng thic c tnh dn
in cao v lp vo u cp bng khun dp thy
lc hay trphi c nhng yu cu khc.
Cp trong ng dn v hko cp sc lp bng
cch ko chng tut ra khi cun cp. Chng sri
vo hcp c che li bi hai cnh bn ca roller
v c ko ra bng tay. Khng c dng ti hay
rng rc ko cp.
Trphi c sng ca Qun l Kthut, trn
cp khng c php c su ni.
cong ti thiu khng c vt qu 12 ln ton
bng knh ca cp hay theo hng dn ca
nh sn xut.
Trkhi c nhng chnh khc, tt ccc ng dnv hcp phi c lm bi nhthu.
9.3.4 CP CHNG NHIU M.I.C.S.
Cp phi c bt kn ngay sau khi ct. Tt ccp
phi c gi trcch in ti thiu 10Mkhi o kim
tra ngay lp tc 1000 V D.C. bng Mega Ohm v
48 gi sau khi bt kn. Qun l K thut c quyn
kim tra cp trong sut qu trnh lp t v cho n
khi kt thc thi gian bo hnh. Bt kcp khngthomn cp cch in sc sa cha hoc
nu cn thit sc Qun l Kthut xem xt v
thay thbi nh thu t c gi trkim tra
ph hp.
u ni cp ti nhng tphn phi, my ct v thit
bni chung sc gn bng loi vt xit vi vng
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/8
made by means of cold screw-on pot type
seals with ring type universal glands. Brass
locknuts with serrated washers shall be used
where cables terminate at apparatus not
provided with screwed entry. For termination of
single core cables to equipment, a piece ofnon-ferrous plate shall be provided. Screw on
cable lugs shall be provided for the cable
connections to equipment.
Through joints, if required, shall be of the
brass sleeve type. The sleeve shall be
internally threaded at each end to receive a
ring type universal gland, fitted to each of the
cable ends. An ebonite spreader shall be used
within the sleeve to hold the cores in position.
Solder type connections shall be used on allcables up to and including 16mm2. Above this
size, mechanical type connections shall be
used.
All joints shall be of acceptable manufacture
and carried out fully in accordance with
manufacturer's installation recommendations.
All terminations and seals shall be made in
accordance with agreed methods, care being
taken to exclude moisture and foreign matter.Compound used in the making of seals shall
be capable of withstanding a temperature of
1500C with plastic sleeving to copper cores.
Where M.I.C.S. cables are installed during
building construction and may be liable to
mechanical damage, they shall be provided
with adequate temporary protection in the form
of sheet steel troughs or by other acceptable
method. Damaged cables not so protected
shall be replaced by the Sub-Contractor at hisown cost.
Where M.I.C.S. cables pass through walls,
they shall be protected with a piece of pipe
sleeve bushed at each end and built into the
wall.
All cables shall be routed entirely separate
m loi thng thng. Oc kho bng ng thau c
long n rng ca sc sdng nhng ni
cp ni vo thit bkhng c lbt vt. i vi cp
n ni vo thit b, mt ming kim loi mu s
c lp vo. Cp ni vo thit bssdng loi
vt bt vo u ct ca cp.
Sni dy, nu cn thit, slm bng mng xng
ni bng ng thau. Mng xng l loi ren rng ti
mi im cui gn mt vng m thng dng,
lp vo mi im cui ca cp. Mt ngn cp c
s dng trong mng xng gi dy ng v tr.
Loi mi ni hn ssdng cho cp di16mm.
Nu ln hn, sdng loini ckh.
Tt cu ni phi ca nh sn xut chuyn dng
v slp t phi hon ton tun theo hng dn
ca nh sn xut.
Tt c s u ni v ron phi lm theo ng
phng php, ch trnh nhng vt lhay m t.
Hp cht sdng lm ron phi c khnng chunhit 1500C
Nhng ch lp t cp chng nhiu M.I.C.S. trong
sut qu trnh xy ng to nh do c khnng b
hhng vckh, chng phi c bo qun tm
thi trong nhng mng bng thp tm hay bng
cch khc c chp thun. Cp b h hng do
khng c bo qun tt sphi c thay thbi
nh thu bng chnh chi ph ca h.
Khi cp M.I.C.S. i xuyn qua tng, chng s
c bo vbng mt ming ng lt bc ngoi ti
mi im cui v c lp vo trong tng.
Cng vic lp t hthng ng dn v lp t cp
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/9
from pipework associated with other services.
Where M.I.C.S. cables pass through floors,
they shall be protected for a distance of not
less than 300mm from floor level with pipe
sleeves.
Where three phase power is run in M.I.C.S.
single cores, the cables shall be installed in a
manner to prevent unnecessary heating up of
the sheaths which will involve an installation in
trefoil formation of the three phases R.Y.B. or
grouped in a double layer for a 4-wire 3 phase
system and spaced from other conductors.
Alternatively, they may be arranged in single
layer, flat formation, touching throughout their
length or if the Sub-Contractor so wishes may
be ordered from the Supplier already laid up intrefoil twisted formation.
M.I.C.S. cables connecting L.V. switched
inductive loads shall be protected from voltage
surges by surge suppressors at the
conductors terminations.
9.3.5 CABLE PIPE SLEEVES, MULTI-CABLE
TRANSITS AND FIRE STOPPING
In certain places, where cables pass throughfloors, walls or other partitions, pipe sleeves
shall be supplied and set in position by the
Sub-Contractor.
After installing the cables, the pipe sleeves
must be thoroughly grouted in or otherwise
securely fixed in position and the space
between the cables and the sleeves
completely filled in with a fire-resisting material,
acceptable to the Fire Services Bureau, and
which has no deleterious effect on the cables.
Every cable entry from exterior into the building
shall be sealed by a Multi Cable Transit
System approved by the Engineer.
The system shall consist of a mild steel frame
with completion tecron insert blocks to
ensure that a gas and liquid tight seal is
phi hon ton tch bit nhau. Nhng ch cp
M.I.C.S. i xuyn qua sn, chng sc bo v
vi khong cch ln hn 300mm tmt sn vi c
ng.
Khi ngun ba pha i bng cp n M.I.C.S., chng
s c lp t theo mt phng php ngn
nga st nng khng cn thit ln v l kiu
lp theo hnh ba l cho ba pha R.Y.B. hay nhm
trong mt lp i cho hthng 3 pha bn dy v v
cch khong vi nhng dy dn khc. Hoc l
chng c thc sp xp trong mt lp n, kiu
phng, nhn thy c trn sut chiu di ca
chng hay nu nh thu mun, chng c thc
order tmt nh cung cp loi kiu hnh ba l xon
li.
Cp chng nhiu M.I.C.S. ni vi ti cm L.V s
c bo vkhi in p nhiu bng bkhnhiu
ti mi im cui ca dy dn.
9.3.5 NG BC LT CP, SL CHCP I QUA
V CHNG CHY
mt sni cp i xuyn qua nhsn, tng haynhng chng ngi vt khc, cbc ng sc
lp t bi nh thu.
Sau khi lp t cp, cng bc cp phi c trm
trt tht klng hay c lp mt cch chc chn
v khong khng gia cp v c ng bc phi
c lm y hon ton bng vt liu chng chy,
ph hp vi quy nh ca S phng chy cha
chy, loi khng nh hng c hi i vi cp.
Cp tngoi i vo trong to nh sc bt kn
bng b chuyn cp (MCT) c ph chun bi
Qun l Kthut.
.
H thng gm c mt khung thp vi cc b lm
kn m bo l hon ton kn khi gas v cht
lng. Snn cht c lm bi tm p v thit b
7/24/2019 Section 9 Cables
11/14
J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/10
achieved. Compression shall be achieved by
either compression plate and end packing
device or by use of a press wedge.
All unused openings in the frame shall be fully
sealed by 'blind' inserts.
9.3.6 EXCAVATION, REINSTATEMENT AND
LAYING OF CABLES
Underground cable shall be laid direct in
trenches unless otherwise indicated (i.e. uPVC
circular cable ducts).
When cable trenches are opened all cables
shall be laid and the trenches shall be
back-filled within 24 hours. At all times safetyprecautions shall be taken and arrangements
made to prevent damage to cables.
Trenches shall be excavated to provide the
minimum cover as follows:-
Type of
Cable
In open
ground
and
under
pavement(mm)
Under road
subject
to vehicular
traffic
(mm)
In other
situation
Control
cable600 800
As
Indicated
L.V.
0.6/1kV600 800
As
Indicated
H.V. 1kV
and
above
1000 1000As
Indicated
Turf and top soil shall be removed carefully
and preserved for re-instatement in their
original positions.
Broken land drains and damage to other
services shall be reported and indicated. All
subsequent costs due to damages shall be
borne by the Sub-Contractor.
The excavation shall be kept free of water and
ng hay sdng ci nm.
Tt cnhng chhkhng sdng trn khung s
c bt kn hon ton bng cht lm kn.
9.3.6 HO, SSAN LP, SSP T CP
Cp chn ngm di t s c t trc tip
trong rnh tr khi c nhng yu cu khc (chng
hn nhng dn cp trn nha PVC).
Sau khi cp c t vo rnh, chng phi c
san lp li trong vng 24 gi. Lun t bng bo
ch an ton trnh lm hhng cp.
Hchn sc o vi kch thc ti thiu nh
sau:
Loi cp
Trn mt t
v di va
h
(mm)
Di
ng giao
thng
(mm)
Cc tnh
hung
khc
Cp iu
khin600 800
Nhhin
th
L.V.
0.6/1kV600 800
Nhhin
th
H.V. 1kV
v ln
hn
1000 1000Nhhin
th
Cc tng v lp t s c o mt cch cn
thn v gisan lp li nhvtr cca chng.
Nhng ng rnh thot nc b b hay lm h
hng nhng cng trnh khc phi c bo co v
trnh by. Tt cnhng chi ph do lm hhng s
phi chu bi nh thu.
Nhng rnh o phi gikh ro, khng c nc
7/24/2019 Section 9 Cables
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J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/11
properly shored up. Other services uncovered
shall be adequately supported by slings or
other means and protected.
Before cables are laid, the bottom of the trenchshall be evenly graded, cleared of loose stones
and then covered with a 75mm layer of earth
which has passed through a sieve with a
maximum mesh of 12mm or where local
ground is unsuitable, with sand.
Power cables shall be pulled in over
adequately spaced cable rollers and the
resulting surplus cable shall be snaked across
the width of the trench. In straight run trenches
cable crossing is not permitted except wherecables branch from the main run. At each
draw-in point, joint or junction box the cable
shall be left slack. Cables shall not be pulled
taut to straighten them after laying. The Sub-
Contractor shall ensure that the strain is taken
on the cores as well as the sheath when
cables are laid.
Where more than one cable is laid in a trench
the cables shall be spaced apart in
accordance with their current rating but subjectto the minimum spacing specified as follows:-
v c chng mt cch hp l. Nhng cng
trnh ph khng c che chn khc s c
chng bng cch treo mc hay nhng cch
khc v c bo v.
Trc khi t cp, y rnh phi lm cho bngphng, loi trnhng vin lng lo ra khi hri
lp mt lp t dy 75mm c sng lc qua lp
li c c mt li rng ti a 12mm hay cht
khng thch hp, c ct.
Cp ngun sc ko qua cun cp c t vi
khong cch thch hp v cui cng cp dsb
ngang qua b rng ca rnh. Trn ng thng
ca hchn khng cho php o ct ngang nhau
tr nhng ch cp chia t ng chnh. Ti miim ko cp vo, u ni hay hp ni cp nn
trng ra. Cp sau khi ko khng nn b ko cng
thng. Nh thu phi m bo l sc cng trn cp
bng vi vbc khi cp c lp t.
Khi c hn mt cp t trong rnh, cp sc t
vi cch khong ph hp vi gi trdng in ca
chng nhng tu thuc vo khong cch ti thiuc cho nhsau:
7/24/2019 Section 9 Cables
13/14
J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/12
Cable H.V L.V
MATV/
Tel
(depth
in mm)
DataCon
trol
Gas,
water
and
other
piped
service
H.V
L.V
MATV/
Tel
Data
Control
Gas,
water
and other
piped
services
300
300
300
300
300
300
150
150
150
300
300
150
50
50
250
300
150
50
50
250
300
150
50
50
250
300
300
250
250
250
(Where this is not possible, 50mm thick
concrete or stone tiles shall be used as
separators)
After laying, the cables shall be covered with
enough fine sieved earth (or sand where the
local ground is unsuitable) to ensure 50mm
cover after tamping. Warning covers shall be
laid over the cables and the trench filled in and
compacted.
Reinstatement shall be effected by back-filling
in 100mm layers and hand ramming the first
two layers. Power rammers may be used forthe remaining layers. The turf shall be
replaced and the level of the finished
reinstatement shall not protrude more than
25mm above the normal ground level.
Co-axial and control cables shall be laid to the
instructions of the manufacturer and
precautions shall be taken to prevent denting,
Cp H.V L.V
MATV/
Tel
(
su
mm)
D
liu
iu
khin
Gas,
nc &
cc h
thng
ng khc
H.V
L.V
MATV/
TEL
Data
iu khin
Gas, nc
& cc h
thng ng
khc
300
300
300
300
300
300
150
150
150
300
300
150
50
50
250
300
150
50
50
250
300
150
50
50
250
300
300
250
250
250
(Nhng ch m bng trn khng thch hp, b
tng dy 50mm hay gch lt sdng nhvt cn).
Sau khi lp t, cp pfhi c lp li hon ton vi
lp t qua sng lc (hoc ct khi t o
khng thch hp) m bo lp dy 50mm sau
khi m. Cp v hchn sc phtm che bo
vmt cch chc chn.
Hchn cp sc san lp li trong nhng lp
dy 100mm v hai lp u tin sc m. My
m c thc sdng san lp. Lp t mtc thay th v sau khi san lp mc cui cng
khng c nh cao hn 25mm so vi mt t.
Cp ng trc v cp iu khin sc lp t
theo hng dn ca nh sn xut v ch trnh
lm c vt lm, xon hay sdi chuyn ca vkhi
7/24/2019 Section 9 Cables
14/14
J. Roger Preston Vietnam Co., Ltd
SECTION 9 CABLES MC 9 CP IN
The English language version prevails u tin s dng ting Anh khi c tranh chp
kinking or displacement of the armouring when
laying the cable in the trench. In particular the
cable shall not be set or bent in a radius of less
than 550mm or 12 times the overall diameter
of the cable whichever is the greater.
Co-axial cables shall not be laid one over the
other.
Where it is necessary to change the level of
the cable the bottom of the trench shall rise or
fall with a slope not greater than 1 in 12.
All cable ends shall be sealed in a manner
recommended by the cable manufacturer.
Approved interlocking cable warning coversshall be provided for power cables laid direct in
the ground.
Each cable run shall be marked at the point
where it leaves the plinth, sub-station, feeder
pillar, lamp pole or other current controlling
device and shall be marked at approximately
every 75m along the cable run with an
additional marker at each change of direction
of the cable run. The Sub-Contractor shall
impress the words "LV CABLES" as requiredon each cable marker.
The location of each underground cable joint
shall be marked by a concrete slab placed
over the joint the word "JOINT" impressed on
each slab.
t cp trong h chn. C thcp khng b xon
hay cong vi bn knh nhhn 550mm hay 12 ln
ton bng knh ca cp.
Cp ng trc kkhng c t ln trn cp khc.
Nhng ch cn thay i cao t cp, y rnh
sc nng ln hay thp xung vi nghing
khng c ln hn 1/12.
Tt ccc im cui ca cp phi c bt kn nh
c hng dn bi nh sn xut.
Cp lin ng vi vcnh bo c chp thun sc cung cp cho cc ngun chy trc tip trn
mt t.
Mi cp s c nh du ti nhng im m
chng i ra nhchn ct, trm ni, ct , cc ca
n hay nhng thit b iu khin dng khc v
c nh du cch khong 75m dc theo chiu
di ca cp v ti nhng chcp i hng. Nh
thu sng du ch "LV CABLES" nhyu cu
trn mi cable marker.
Vtr ca mi im ni cp di t sc nh
du bng mt tm b tng t ln trn v c
ng du ch"JOINT" trn mi tm.
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