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APPENDIX 8
ELECTRICAL SYMBOLS
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Table of Contents
1. Current Systems, System Configurations And Protective Conductors .................................................... 32. Screening, Enclosure And Medium....................................................................................................... 53. Regulating Systems .............................................................................................................................. 64. Mechanical Controls............................................................................................................................. 75. Qualifying Symbols.............................................................................................................................. 86. Batteries, Semi-Conductors, Generators, Motors And Converters ........................................................ 107. Transformers, Reactors And Transductors........................................................................................... 128. Conductors, Lines And Cables ............................................................................................................ 159. Overhead Line And Cable Accessories................................................................................................ 2010. Terminals, Connections And Contact Elements ................................................................................. 2111. Resistors, Coils And Capacitors ........................................................................................................ 2212. Relay Coils And Contacts ................................................................................................................. 2313. Circuit Breakers, Contactors, Plugs, Sockets And Push Buttons......................................................... 2614. Automatic Tripping Devices, Starting Equipment And Remote-Control Units.................................... 2915. Switch-gear And Distribution Boxes ................................................................................................. 3316. Protective Devices ............................................................................................................................ 3417. Instruments And Metering Systems................................................................................................... 3518. Lamp Fittings, Etc ............................................................................................................................ 3819.Generating Stations And Substations (Planned).................................................................................. 4120. Signaling Equipment And Clocks...................................................................................................... 4221. Protection Relay Symbols ................................................................................................................. 43
21.1 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 4321.2 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 4521.3 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 4821.4 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 50
22. Building Electrical Installation (Light Switches)................................................................................ 5123. Electro Acoustic Elements ................................................................................................................ 5424 Cathodic Protection ........................................................................................................................... 5525. Hazardous Area Classification .......................................................................................................... 56
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APPENDIX - 8
1. Current Systems, System Configurations And ProtectiveConductorsE0101A IEC
Direct Current (DC)
E0102 IEC
Alternating current,(AC) low freq. (power
or sub audio freq.)
E0103 IEC
Alternating current,medium freq. (audio ortelephone freq.)
E0104 IEC
Alternating current, highfreq. (super audio, carrier
and radio freq.)
E0105 IEC
Direct or alternatingcurrent (DC or AC)symbol for equipmentfor universal use
E0106 IEC
Rectified current withalternating component
E0107 IEC
Alternating current of mphases and frequency f
63B1 IEC
Three conductors withinone screen
E0108 IEC
One Winding
E0109 IEC
Three separate windings
E0110 IEC
m Separate Windings,
E0111 IEC
Three-phase winding,T-Connected
E0112 IEC
Two-phase winding
E0113 IEC
Two-phase winding,four wire
E0114 IEC
Three-phase windingV-Connected (60o)
E0115 IEC
Three-phase winding,open-delta connected
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E0116 IEC
Three - phase winding,delta-connected
E0117 IEC
Three-phase winding,three wire
star-connected
E0118 IEC
Three-phase winding,four wire, star-
connected, with neutralbrought out.
E0119 IEC
Star-delta windingconfiguration
E0120 IEC
Connection symbol, e.g.of a primary delta-
secondary star-connected, three-phasetransformer with clockhour figure 11. Capitalletter for high voltage
winding
E0121 IEC
Three-phase winding,three wire zig-zag orinterconnected star
E0122 IEC
Three-phase winding,four wire zig-zag or
interconnected star, withneutral brought out.
E0123 ZADCO
Six-phase winding,double-delta-connected
E0124 IEC
Six-phase winding,polygon-connected
E0125 IEC
Six-phase winding,star-connected
E0126 IEC
Danger (high voltage)
E0127 IEC
Place of breakdown orfaults as used in short-circuit calculations or
protective gear diagramsE0128 IEC
Supply DC System
E0129 IEC
Supply DC SystempositiveNegativeMid-Wire
E0130 IEC
Earth (ground), general
E0131 IEC
Protective earth(ground)
E0132 IEC
No Symbol
Protective conductorand neutral conductor
combined
E0133 IEC
Noiseless (clean)earth (ground)
E0134 IEC
Frame or chassis
E0135 IEC
Equipotentiality
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APPENDIX - 8
2. Screening, Enclosure And Medium
E0201 IEC
Enclosure, general
E0202A IEC
Screen (the screen maybe drawn in any
convenient shape)
Empty
E0203 IEC
Boundary line (anycombination of short
and long strokes)
E0204 IEC
Liquid material
E0205 IEC
Gaseous material
E0206 IEC
Insulation material
E0301 IEC
Variability, general(non-inherent)
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APPENDIX - 8
3. Regulating Systems
E0302 IEC
Variability, pre-setadjustment
E0303 IEC
Variability, inherent
E0304 IEC
Variability, inherent,non-linear
E0305 IEC
Continuous variability
E0306 IEC
Variability in steps
E0307 IEC
Variability, continuos
E0308 IEC
Variability, variable in 8steps
E0309 IEC
Variability, inherentlyautomatic
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APPENDIX - 8
4. Mechanical Controls
E0401A IEC
A/ General symbol
E0401B IEC
B/ For use in restrictedspace
E0402 IEC
Locking device, padlockfacility
E0403 IEC
Devices for restrictedmovement of amechanical link
(unblocked position)E0404 IEC
Devices for restrictedmovement of amechanical link
(unblocked position)
E0405 IEC
Mechanical interlockbetween two devices
E0406 IEC
Automatic return(e.g. spring return)
E0407 IEC
Non-automatic return
E0408 IEC
Manually operatedcontrol, general
E0409 IEC
Manually operatedcontrol with restricted
access
E0410 IEC
Operated by pushing
E0411 IEC
Operated by pulling
E0412 IEC
Operated by turning
E0413 IEC
Operated by hand-wheel
E0414 IEC
Operated by pedal
E0415 IEC
Operated by leverE0416 IEC
Operated by roller
E0417 IEC
Operated by cam
E0418 IEC
Operated by crank
E0419 IEC
Operated by removablehandle
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APPENDIX - 8
5. Qualifying Symbols
E0503 IEC
Repeating 0 times
E0504 IEC
Rectilinear force ormotion in the direction
of the arrow
E0505 IEC
Bi-directionalpectilinear force or
motion
E0506 IEC
Uni-directional rotationin the direction of the
arrow for exampleclockwise
E0507 IEC
Bi-directional rotationlimited in both
directions
E0508 ZADCO
Start (on)
E0509 ZADCO
Stop (off)
E0510 IEC
Automatic releasefunction
E0511 IEC
Light-operated arrowpointing towards symbollight generating and/or
modulating arrowspointing away from
symbols
E0512 IEC
Temperaturedependence
E0513 IEC
Permanent magnet
E0514 IEC
Contactor function
E0515 IEC
Circuit breaker
E0516 IEC
Disconnector (isolator)function
E0517 IEC
Switch-disconnector(isolating switch)
function
E0518 IEC
Position switch functionlimit switch function
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E0519 IEC
Delayed action in thedirection of movementfrom the arc towards its
center. (to be linkedwith double line E0401
to the symbol of thedevice)
E0520 IEC
Spring return function
E0521 IEC
Non-spring return(stay put) function
E0522 IEC
Operating when thecharacteristic value ishigher than the setting
value
E0523 IEC
Operating when thecharacteristics value islower than the setting
value
E0524 IEC
Operating when thecharacteristics value is
either higher than agiven high setting or
lower than a given lowsetting
E0525 IEC
Operating when thecharacteristic value
becomes zero
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APPENDIX - 8
6. Batteries, Semi-Conductors, Generators, Motors AndConverters
E0601 IEC
Primary cell oraccumulator (the long
line represents thepositive pole, the other
the negative)
E0602 IEC
Battery of accumulators orprimary cells
E0603 IEC
Battery with tapping
E0604 IEC
Semi-conductor diode
E0605 IEC
Bi-directional diode(varistor)
E0606 IEC
Breakdown diode,undirectional
E0607 IEC
Breakdown diode, bi-directional
E0608 IEC
Thyristor, general
E0609 IEC
Reverse blockingthyristor n-gate (anode
side controlled)
E0610 IEC
Reverse blocking thyristorp-gate (cathode side
controlled)
E0611 IEC
Bi-directional thyristor
E0612 IEC
TransistorPNP
E0613 IEC
TransistorNPN
E0614 IEC
Machine general symbol.The asterisk shall bereplaced by a letter
designation as follows:-Motor(M), generator(G),
synchronousConverter (c)
E0615 IEC
Machine capable of useas motor or generator,
general
E0616 IEC
Mechanically coupledmachines, general
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E0617 ZADCO
Non rotary generator,oscillator
E0618 IEC
Stator with two windings
E0619 IEC
Shunt winding orseparate winding
E0620 IEC
Series winding
E0621 IEC
Commutating orcompensating winding
E0622 IEC
Synchronous converter,general
E0623 IEC
Power converter,general the arrow is
optional
E0624 IEC
Rectifier, powerconverter AC/DC
E0625 IEC
Inverter, powerconverter DC/AC
E0626 IEC
DC Converter, powerconverter DC/DC
E0627 IEC
Frequency changer,power converter f1/f2
E0628 IEC
Static switch
E0629 IEC
Synchronous generator(GS) or synchronous
motor (MS), threephase, both leads of
each phase brought out
E0630 ZADCO
DC generator withpermanent magnet
excitation
E0631 IEC
Three phase inductionmotor with slip ring
rotor
E0632 IEC
Three - phase inductionmotor with squirrel -
cage rotor.
E0633 IEC
Three - phase inductionmotor with squirrel -
cage rotor, all sixwinding ends brought
out
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APPENDIX - 8
7. Transformers, Reactors And TransductorsE0701 IEC
Choke reactor, inductor,winding
multi - linerepresentation
E0702 IEC
Ferro-magnetic core,general
E0703 IEC
Ferro-magnetic corewith air gap, general
E0704 IEC
Winding of atransformer, general
E0705 IEC
Transformer, singlephase with two separate
windings simplifiedsingle line
representation
E0706 IEC
Transformer, singlephase with two separate
windings multi linerepresentation
E0707 IEC
Transformer with twotappings single phasesimplified single line
representation
E0708 IEC
Transformer with twotappings single phase
multi line representation
E0709 IEC
Auto-transformer, singlephase simplified single-
line representation
E0710 IEC
Auto-transformer, singlephase multi linerepresentation
E0711 IEC
Choke reactor, inductor,winding simplified
single - linerepresentation
E0712 IEC
Inductor (reactor) withFerro-magnetic core
unless otherwiseindicated, general
multi line representationE0713 IEC
Induction regulator,single phase simplified
single - linerepresentation
E0714 IEC
Induction regulator,single phase multi-line
representation
E0715 IEC
Current transformer,general simplified single
line representation
E0716 IEC
Current transformer,general multi line
representation
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E0717 IEC
Current transformerwith two secondary
windings on one coresimplified single line
representation
E0718 IEC
Current transformerwith two secondary
windings on one coremulti line representation
E0719 IEC
Current transformerwith two cores
simplified single linerepresentation
E0720 IEC
Current transformerwith two cores multiline representation
E0721 IEC
Voltage transformersimplified single line
representation
E0722 IEC
Voltage transformer,multi line representation
E0723 IEC
Transductor winding,general
E0724 IEC
Transductor core
E0725 IEC
Transformer with off-voltage tap changer,
three-phase
E0726 IEC
Transformer with off-voltage tap changer,
three phase
E0727 IEC
Current transformer,where the primary
conductor forms fivewinding turns simplified
single linerepresentation
E0728 IEC
Current transformer,where the primary
conductor forms fivewinding turns multi line
representationE0729 IEC
Current transformerwith three primary
windings simplifiedsingle line
representation
E0730 IEC
Current transformerwith three primarywindings multi line
representation
E0736 ZADCO
Current transformersurrounding threeconductors (core
balance) simplifiedsingle line
representation
E0737 IEC
Current transformersurrounding threeconductors (corebalance) multi linerepresentation
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E0731 IEC
Current transformer,with one secondarytapping (three leads
brought out) simplifiedsingle - line
representation
E0732 IEC
Current transformer,with one secondarytapping (three leads
brought out) multi linerepresentation
E0733 IEC
Transductor element inassembled
representation
E0734 IEC
Zig-Zag transformer
E0735 IEC
Tertiary windingtransformer
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APPENDIX - 8
8. Conductors, Lines And Cables
E0801 IEC
Conductor or group ofconductors, general
E0802 IEC
General symboldenoting screening of
conductors
E0803 IEC
Conductors (n ×) withinone screen
E0804 IEC
Flexible conductor
E0805 IEC
General symboldenoting twisting of
conductors
E0806 IEC
Conductors (n ×)twisted
E0807 IEC
General symboldenoting cable
E0808 IEC
Conductors (n ×) withinone cable
Empty
E0810 IEC
Underground line
E0811 IEC
Line not mounted insight
E0812 IEC
Line mounted in sight
E0813 IEC
Submarine line
E0814 IEC
Conductors in conduit
E0815 IEC
Neutral conductor
E0816 IEC
Earthed conductor
E0817 IEC
Earthed metallic screen
E0818 IEC
Conductors, crossingwithout electrical
connection
E0819 IEC
Junction of conductors
E0820 IEC
Double junction ofconductors
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E0821 IEC
Common connection toa group of apparatus
(e.g. multipled orlooped)
E0822 IEC
Test point indicator
E0823 IEC
Conductor joint, in linesplice
E0824 IEC
Method of indicatingconductors data if themarked wires lie in onecable bundle or circuit
E0825 IEC
Method of indicatingdata for each separatewire or cable in onebundle or channel
E0826 IEC
Method of indicatingdata for each separatewire or cable if more
than one cable isrepresented by one line
E0827 IEC
Conductors dividing
E0828 IEC
Conductors dividing
E0829 IEC
Conductors dividing
E0830 IEC
Bundle of wires orcables
E0831 IEC
Bundle of wires orcables, crossing
E0832 IEC
Bundle of wires orcables, dividing
E0833 IEC
Wiring or conductorgoing upwards
E0834 IEC
Wiring or conductorgoing downwards
E0835 IEC
Wiring or conductorpassing through
vertically
Empty
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Empty Empty
E0839 IEC
Coaxial pair, general
E0840 IEC
Coaxial pair with outerconductor connected to
earthE0841 IEC
Coaxial pair with screen
E0842 IEC
End of coaxialconductor
E0843 IEC
Conductor or cable notconnected
E0844 IEC
Conductor or cable notconnected and
especially insulatedE0845 IEC
Four separate circuits orconductors
E0846 IEC
Three phase circuit 50Hz three conductors of120mm2 and neutral of
50mm2 single -linerepresentation
E0847 IEC
Three phase circuit 50Hz three conductors of120mm2 and neutral of50mm2 for multi-line
representation
E0848 IEC
Three phase circuit 50Hz three conductors of120mm2 and neutral of50mm2 for multi-line
representation
E0849 IEC
Coaxial socket
E0850 IEC
Coaxial plug
E0851 IEC
Earth bar
E0852 ZADCO
Main plant earthelectrode
E0853 ZADCO
Supplementary earthelectrode
E0854 ZADCO
Equipment frame earthconnection
E0855 ZADCO
Earth cable on surface
E0856 ZADCO
Earth cable branchconnection
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E0857 ZADCO
Conduit laid in floorscreed
E0858 ZADCO
Conduit run on surface
E0859 ZADCO
Conduit concealed inslab
E0860 ZADCO
Cable run on surface
E0861 ZADCO
Micc cable run onsurface
E0862 ZADCO
Cable tray
E0863 ZADCO
G.I / PVC trunking
E0864 ZADCO
Elect./Inst./Telecom.cable in under groundPVC duct
E0865 ZADCO
Under ground earthcable in excavatedtrench (Existing)
E0866 ZADCO
Under ground earthcable in excavatedtrench (proposed)
E0867 ZADCO
Earth cable in concretetrench (existing)
E0868 ZADCO
Earth cable in concretetrench (proposed)
E0869 ZADCO
Elect../Inst./Telecom.under ground cable in
excavated trench(existing)
E0870 ZADCO
Elect./Inst./Telecom.under ground cable in
excavated trench(proposed)
E0871 ZADCO
Elect./Inst./Telecom.cable in concrete trench
(existing)
E0872 ZADCO
Elect./Inst./Telecom.cable in concrete trench
(proposed)
E0873 IEC
Neutral conductor
E0874 IEC
Protective conductor
E0875 IEC
Combined protectiveand neutral conductor
E0876 IEC
Three-phase wiring withneutral conductor andprotective conductor
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E0877 IEC
Three-phase and neutralor three conductors andneutral
E0878 IEC
Three-phaseor three conductors
E0879 IEC
Single-phase and neutralor single conductor and
neutral
E0880 IEC
Two-phase or twoconductors
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APPENDIX - 8
9. Overhead Line And Cable Accessories
Empty
E0910 ZADCO
Conduit entry
E0911 ZADCO
Stuffing gland
E0912 IEC
Straight-through jointbox underground
E0913 IEC
Junction for three cablesunderground
E0914 IEC
Junction for four cablesunderground
E0915 IEC
Cable sealing end box
E0916 IEC
Branching box (e.g.with four outlets)
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APPENDIX - 8
10. Terminals, Connections And Contact Elements
E1001 IEC
Terminal connections ofconductors, general
E1002 IEC
Terminal connections ofconductors, generalmoveable contact
hinged
E1003 IEC
Terminal strip
E1004 ZADCO
Connection link withbolted contacts
E1005A IEC
Connecting link, closed
E1005B IEC
Connecting link, open
E1006 IEC
Brush on commuter orslip ring
E1007 ZADCO
Draw-out representationof switch-gear
accessoriesE1005A IEC
Mated Plug and socket
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APPENDIX - 8
11. Resistors, Coils And Capacitors
E1101 IEC
Resister
E1102 IEC
Resistor with fixedtappings
E1103 IEC
Inductor, coil, winding,choke
E1104 IEC
Shunt
E1105 IEC
Capacitor, capacity,general
E1106 IEC
Polarized capacitor,general
E1107 IEC
Polarized electrolyticcapacitor
E1108 IEC
Non-polarizedelectrolytic capacitor
E1109 IEC
Chasis capacitor
E1110 IEC
Feed through capacitor
E1111 IEC
Code letters, indicatingtype of impedance
1 impedance
E1111 IEC
2. Reactance
E1111 IEC
3. Self inductance
E1111 IEC
4. Resistance
E1112 IEC
Variable resistor
E1113 ADC O
Variable resistor withinherent non-linear
characterE1114 IEC
Resistor with inherentnon-linear character
E1115 IEC
Resistor with inherent non-linear character
E1116 IEC
Resistor with slidingcontact
E1117 IEC
Shunt / series capacitor
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APPENDIX - 8
12. Relay Coils And Contacts
E1201 IEC
CON= ContactorIR = InterposingRelayCC = Closing coilTC = Tripping CoilK = Re-Acceleration
E1202 IEC
Non-inductive winding(bifilar)
E1203 IEC
Relay coil with onewinding
E1204 IEC
Relay coil with twowindings, separate
representation
E1205 IEC
Relay coil of a remnantrelay
E1206 IEC
Relay coil of a slowreleasing relay
E1207 IEC
Relay coil of a veryslow-releasing relay
E1208 IEC
Relay coil of slow-operating relay
E1209 IEC
Relay coil of a very slowoperating relay
E1210 IEC
Relay coil of a high-speedrelay (fast-operating and
releasing)
E1211 IEC
Relay coil of apolarized relay
E1212 IEC
Relay coil of an ACrelay
E1213 IEC
Relay coil of a relay un-affected by alternating
current
E1214 IEC
Relay coil of amechanically latched relay
E1215 IEC
Relay coil of animpulse, sequence
relay
E1216 IEC
Relay coil of a slow-operating and slow
releasing relay
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E1217 IEC
Actuating device for athermal relay(e.g.
thermal overload relay)
E1218 IEC
Make contact
E1219 IEC
Break contact
E1220 IEC
Change over contact,break before make
E1221 IEC
Change over contact,make before break
E1222 IEC
Contact with two breaks
E1223 IEC
Contact with twobreaks
E1224 IEC
Two way contact withcenter-off position
E1225 IEC
Two-way contact withcenter-off position withspring return from theleft-hand position, butnot from the right-hand
one (stay put)
E1226 IEC
Passing make contactclosing momentarily when
its operating device isactuated
E1227 IEC
Passing make contactclosing momentarilywhen its operatingdevice is released
E1228 IEC
Passing make contactclosing momentarilywhen its operating
device is actuated orreleased
E1229 IEC
Make contact (of amultiple contact
assembly) which is earlyto operate relative to the
other contacts of theassembly
E1230 IEC
Make contact (of amultiple contact assembly)
which is late to operaterelative to the other
contacts of the assembly
E1231 IEC
Break contact(of a multiple contactassembly) which is
early to operate relativeto the other contacts of
the assembly
E1232 IEC
Break contact (of amultiple contact
assembly) which is lateto operate relative tothe other contacts of
the assemblyE1233 IEC
Flasher, operated by anactuating device of a
thermal relay
E1234 IEC
Make contact delayedwhen closing
E1235 IEC
Break contact delayedwhen closing
E1236 ZADCO
Break contact delayedwhen opening
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E1236A ZADCO
Make contact delayedwhen opening
E1237 IEC
Self operating thermalbreak contact
E1238 IEC
Break contact of athermal relay
E1239 ZADCO
Change-over contact,break before make of apolarized relay
226C9 ZADCO
Single-pole, 4 positionswitch with position
diagram
226C10 ZADCO
Single-pole, 6 positionswitch with a wiper that
bridger only while passingfrom one position to the
next
Empty Empty
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APPENDIX - 8
13. Circuit Breakers, Contactors, Plugs, Sockets And PushButtonsE1301 IEC
Switch
E1302 IEC
Change over switch,break before make
E1303 IEC
Two way switch withcenter-off position
E1304 IEC
Circuit breaker
E1305 IEC
Disconnector (isolator)
E1306 IEC
Switch disconnector (on-load isolating switch)
E1307 IEC
Switch disconnector(on-load isolating
switch) with automaticrelease
E1308 ZADCO
Two way disconnector(isolator) with
interruption of circuit
E1309 ZADCO
Two way disconnector(isolator) without
interruption of circuit
E1310 IEC
Two way disconnector(isolator) with center off
position
E1311 IEC
Contactor
E1311A IEC
Contactor normallyclosed
E1312 IEC
Contactor withautomatic release
E1313 IEC
3-position switch,normally closed (only
opening when operatedto the left)
E1314 IEC
Mercury switch
E1315 IEC
Multi-pole plug andsocket isolator, N-pole
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E1316 IEC
Connector assemblyfixed portion
E1317 IEC
Connector assemblymovable portion
E1318 IEC
Mated connectors, plugside fixed and socket
side movable
E1319 ZADCO
MCB (Miniature circuitbreaker with thermal &
magnetic protection)E1320 ZADCO
MCCB (Mounded casecircuit breaker withthermal & magnetic
over current protection)
E1320A ZADCO
RCCB (Restricted currentcircuit breaker with
thermal & magnetic overcurrent protection and
earth leakage protection)
E1320B ZADCO
ELCB (Earth leakagecircuit breaker with earth
leakage protection)
E1321 ZADCO
Triple pole circuitbreaker e.g. air C.Bfitted with 3 thermal
over current relays and 3thermo magnetic relays
E1322 ZADCO E1323 ZADCO E1324 IEC E1325 IEC
Earth Switch Rack draw-out typecircuit breaker (typical
for other draw-outcomponents)
Remote control unit,rotary stack type withspring return to neutralposition and padlock
facility
Manually operatedthree-pole switch
1. Simplified single-line representation
E1326 IEC
Manually operatedthree-pole switch
2. Multi-linereorientation
E1327 IEC
Push - Button
E1328 IEC
Push - button withindicator lamp
E1329 IEC
Push - button withrestricted access (glass
cover, etc)
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E1330 IEC
Start push button(non-locking)
E1331 IEC
Stop push button(non-locking)
E1332 IEC
Emergency stop pushbutton
E1333 ZADCO
Selector switch - 3position
E1334 ZADCO
Selector switch - 2position
E1335 IEC
Plug & socket (male& female)
E1336 IEC
Limit switch - makecontact
E1337 IEC
Limit switch - breakcontact
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APPENDIX - 8
14. Automatic Tripping Devices, Starting Equipment AndRemote-Control Units
E1401 IEC
Measuring relay orrelated device, general
E1402 IEC
Measuring relay controlledby two or more mutuallydependent magnitudes
Empty Empty
E1405-1 IEC
Over current
E1405-2 IEC
Undervoltage
E1405-3 IEC
Differential current
E1405-4 IEC
Reverse current
E1405-5 IEC
Time
E1405-6 IEC
Frequency
E1405-7 IEC
Earth-fault current
E1405-8 IEC
Reverse power
E1405-9 IEC
Overspeed
E1405-10 IEC
Phase-failure detection
E1405-11 IEC
Interturn short circuits
E1405-12 IEC
Out of synchronism(out of step)
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E1405-13 IEC
Time delay
E1405-14 IEC
Inverse time lagcharacteristic
E1405-15 IEC
Thermal overload(bimetal)
E1405-16 IEC
Electromagnetic
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E1405-17 IEC
Temperature
E1405-18 IEC
Pressure
E1405-19 IEC
Fluid level
E1405-20 IEC
Flow
E1405-21 IEC
Direction of energy flowtowards from bus bars
E1405-22 IEC
Direction of energy flowaway from bus bars
E1405-23 IEC
Bi-directional energyflow
E1408 IEC
Blow out device coiltype
E1409 IEC
Blow out devicepermanent magnet type
E1410 IEC
Starter, general (for use onsingle-line diagrams)
E1411 IEC
Automatic starter
E1412 IEC
Automatic starter
E1413 IEC
Starter with automaticrelease
E1414 ZADCO
Direct on-line contactorstarter with protective
device
E1415 IEC
Direct on line contactorstarter for reversing
motors
E1416 IEC
Series parallel starter
E1417 IEC
Auto transformer starter
E1418 IEC
Star delta starter
E1419 IEC
Pole changing starter(e.g 8/4 poles)
E1420 ZADCO
Remote control unitwith ammeter
controlled by rotarystack switch for use on
single line diagram
32 of 56
E1421 ZADCO
Remote control unitwith ammeter controlledby push buttons for useon single line diagrams
E1422 ZADCO
Remote control unit asE1420 & E1421, but for
use on layouts only
E1423 ZADCO
Remote control unitwithout ammeter
controlled by rotarystack switch for use on
single line diagrams
E1424 ZADCO
Remote control unitwithout ammeter
controlled by pushbuttons for use on
single line diagrams
E1425 ZADCO
Remote control unit asE1423& E1424, but for
use on layouts only
E1426 ZADCO
Safety switch for use onsingle line diagram
E1427 ZADCO
Safety switch for useon layouts only
E1428 ZADCO
Emergency switch foruse on single line
diagramsE1429 ZADCO
Emergency switch foruse on layouts only
E1430 ZADCO
Remote ammeter for useon layouts only
E1431 ZADCO
Remote control unitwith push buttons for
use in P & ID’S
E1432 ZADCO
Remote control unitwith start/stop push
buttons andlocal/remote selector
switch
33 of 56
APPENDIX - 8
15. Switch-gear And Distribution Boxes
E1501 IEC
Switch gear, general
E1502 ZADCO
Control desk
E1503 IEC
Distribution center orbus bars with incomingand outgoing, circuits
E1504 IEC
Over-ground, weather-proof enclosure, general
symbol pillar box
34 of 56
APPENDIX - 8
16. Protective Devices
E1601 IEC
Fuse with supply sideindicated by thick line
E1602 IEC
Fuse with supply sideindicated by thick line
E1603 IEC
Fuse switch
E1604 IEC
Fuse disconnector (fuseisolator)
E1605 IEC
Fuse switchdisconnector (on loadisolating fuse switch)
E1606 IEC
Fuse with mechanicallinkage (striker fuse)
E1607 IEC
Fuse with separate alarmcontact
E1608 IEC
Fuse with alarm contact(3-terminals)
E1609 IEC
Spark gap
E1610 IEC
Lightning arrester
E1611 IEC
Over-voltage arrester
E1612 IEC
Protective gas dischargetube
E1613 IEC
Link (closed)
E1614 IEC
Link (open)
35 of 56
APPENDIX - 8
17. Instruments And Metering Systems
E1701 IEC
Indicating instrument,general
E1702 IEC
Recording instrument,general
E1703 IEC
Integrating instrument,general
E1705 IEC
Telemetering transmitter
E1706 IEC
Telemetering receiver
E1707 IEC
Measuring instrumente.g. voltmeter for
controlling telemeteringtransmitter
E1708 IEC
Telemetering receivercontrolling a measuring
instrument (e.g.voltmeter)
E1709 IEC
Permanent-magnetmoving coil instrument
E1710 IEC
Permanent magnetmoving coil ratio-meter
(quotient meter)
E1711 IEC
Moving permanentmagnet instrument
E1712 IEC
Moving permanentmagnet ratio-meter
(quotient meter)E1713 IEC
Electro-dynamic,ironless instrument
E1714 IEC
Electro-dynamic,ironless ratio-meter
(quotient meter)
E1715 IEC
Electro-dynamic, iron-cored instrument
E1716 IEC
Electro-dynamic, iron-cored instrument
E1717 IEC
Moving -iron system
E1718 IEC
Moving-iron ratio-meter(quotient meter)
E1719 IEC
Vibrating reedinstrument
E1720 IEC
Electrostatic instrument
36 of 56
E1721 IEC
Thermal (hot wire)instrument
E1722 IEC
Bimetallic instrument
E1723 IEC
Non-insulatedthermocouple, thermal
converter
E1724 IEC
Insulated thermocouple,thermal converter
E1725 IEC
Accuracy class index,e.g. 1.5 with errors
expressed as apercentage of the true
valve
E1726 IEC
Test voltage above 500 ve.g. 2kv (indication “0”for apparatus not subject
to dielectric tests)
E1727 IEC
Instrument used withthe supporting surface
vertical
E1728 IEC
Instrument used with thesupporting surface
horizontal
Empty
E1730 IEC
Zero adjuster
E1731 IEC
Electronic device inmeasuring circuit
E1732 IEC
Electronic device inauxiliary circuit
E1733 IEC
Thermocouple, general(the negative pole isrepresented by the
thicker line)
E1734 IEC
Thermocouple, directlyheated, non-insulated
heating element
E1735 IEC
Thermocoupleindirectly heatedinsulated heating
element
E1736 IEC
Instrument shunt
E1737 IEC
Amplifier
E1738 IEC
Single phase bridgeconnected rectifier
Empty
37 of 56
*Note:
Terminologies for use in meters applicable to E1701, E1702, E1703
1. Ampere2. Volt3. Differential volt4. Double volt5. Watt6. Watt-hour7. Hertz8. Synchroscope9. Power-factor10. Reactive volt-ampere hour11. Volt-ampere hour12. OHM13. Hour14. Direction indicator15. Minute16. Second17. Time18. Multiples and sub-multiples
Tera =1012
Giga = 109
Mega = 106
Kilo = 103
Mili = 103
Micro= 106
Nano= 109
Pico= 101219. Ammeter selector switch ZADCO20. Voltmeter selector switch ZADCO21. Selector switch ZADCO22. Auto voltage regulator ZADCO
38 of 56
APPENDIX - 8
18. Lamp Fittings, Etc
E1801 IEC
Lighting outlet position,shown with wiring
E1802 ZADCO
Emergency lamp fitting,maintained
E1803 ZADCO
Emergency lamp fitting,non maintained
E1804 IEC
Emergency lightingluminaire on special
circuitE1805 ZADCO
Discharge lamp, general
E1806 IEC
Discharge lamp (e.g. Hg=mercury, no. = sodium)
E1807 IEC
Neon (signal) lamp
E1808 IEC
Signal Lamp /Illuminating Lamp *
*Notes:
If it is desired to indicate the color (c) a notation in accordance with IEC publication 62 is placed adjacentto the symbol e.g.
RD - redBU-blue YE-yellowWH-white GN-green AM-amber
If it is desired to indicate the type of lamp, a notation according to the following codes is placed adjacent tothe symbol:
Ne-neonXe-xenonNq-sodium vapourHg-mercuryI-iodineIN-incandescentEL-electroluminescentARC-fluorescentFL-fluorescentIR-infra-redUV-ultra-violetLED-light-emitting diode
39 of 56
Empty
E1810 ZADCO
Suspended incandescentlight fitting
E1811 ZADCO
Wall mountedincandescent light fitting
E1812 IEC
Fluorescent lamp,general symbol
E1813 IEC
Luminaries with twofluorescent tubes
E1813A ZADCO
Luminaries with fivefluorescent tubes
E1814 IEC
Fluorescent lamp onspecial circuit, e.g.emergency circuit
E1815 IEC
Spot light
E1816 IEC
Flood light
E1817 ZADCO
Flood light mounted onlighting mast
E1818 IEC
Navigation lamp
E1819 IEC
Electrical appliance
E1820 IEC
Heating element (e.gfrom heater)
E1821 IEC
Signal lamp, flashing type
E1822 IEC
Auxiliary apparatus fordischarge lamp
(e.g. ballast)
E1823 IEC
Light dependent resistorphoto-conductive
device withsymmetricalconductivity
E1824 IEC
Photodiodephoto-conductive device
with asymmetricalconductivity
E1825 IEC
Optical coupling deviceopto isolator shown withlight emitting diode and
photo-transistor
E1826 IEC
Emergency lighting withbattery back-up
E1827 ZADCO
Fluorescent lamp withbattery back-up
40 of 56
E1828 ZADCO
Bulkhead light fitting
E1829 ZADCO
Lighting pole
E1830 ZADCO
Lighting pole
41 of 56
APPENDIX - 8
19.Generating Stations And Substations
E1901 IEC
Generating station(power plant), general
E1902 IEC
Generating station, oil orgas
E1903 IEC
Generating station,thermo-electric
E1904 IEC
Generating stationhydro-electric
E1905 IEC
Generating station oil orgas with gas turbine
E1906 IEC
Substation, general (e.g.intake station
E1907 IEC
Plant station
Empty
GENERATING STATIONS AND SUBSTATIONS (IN SERVICE)
E1911 IEC
Generating station(power plant), general
E1912 IEC
Generating station, oil orgas
E1913 IEC
Generating station,thermo-electric
E1914 IEC
Generating stationhydro-electric
E1915 IEC
Generating station oil orgas with gas turbine
E1916 IEC
Substation, general (e.g.intake station)
E1917 IEC
Plant station
E1918 IEC
Rectifier substation
42 of 56
APPENDIX - 8
20. Signaling Equipment And Clocks
E2001 IEC
Bell, electric, general
E2002 IEC
Buzzer, electric, general
E2003 IEC
Horn, electric, general
E2004 IEC
Siren, electric, generalE2005 IEC E2006 IEC E2007 IEC E2008 IEC
Electromechanicalposition indicator withone de-energized and
two operating positions
Electro mechanicalindicator with alarm con
tact
Clock, general Master clock
E2009 IEC E2010 IEC E2011 IEC E2012 ZADCO
Time - switch Synchronous clock (e.g. 50HZ)
Clock with an electricmotor rewind
Drop enunciator makecontact actuated by theactuating system, makecontact actuated by the
targetE2013 IEC
Mechanical indicator
E2014 IEC
Common alarm indication
43 of 56
APPENDIX - 8
21. Protection Relay Symbols
21.1 Device Function Numbers, Indicating The Device Function WhichCauses Relay Operate
E2101 IEEE
1. Master element
E2101 IEEE
2. Time-delay starting orclosing relay
E2101 IEEE
3. Checking orinterlocking relay
E2101 IEEE
4. Master contactor
E2101 IEEE
5. Stopping device
E2101 IEEE
6. Starting circuitbreaker
E2101 IEEE
7. Rate-of-change relay
E2101 IEEE
8. Control powerdisconnecting device
E2101 IEEE
9. Reversing device
E2101 IEEE
10. Unit sequenceswitch
E2101 IEEE
11. Multifunction device
E2101 IEEE
12. Over-speed device
E2101 IEEE
13. Synchronous-speeddevice
E2101 IEEE
14. Under-speed device
E2101 IEEE
15. Speed or frequencymatching device
E2101 IEEE
16. Reserved for futureapplication
E2101 IEEE
17. Shunting ordischarge switch
E2101 IEEE
18. Accelerating ordecelerating device
E2101 IEEE
19. Starting-to-runningtransition contactor
44 of 56
E2101 IEEE
20. Electrically operatedvalve
E2101 IEEE
21. Distance relay
E2101 IEEE
22. Equalizer circuitbreaker
E2101 IEEE
23. Temperature controldevice
E2101 IEEE
24. Volts per hertz relay
E2101 IEEE
25. Synchronizing orsynchronism-check
device
E2101 IEEE
26. Apparatus thermaldevice
E2101 IEEE
27. Under-voltage relay
E2101 IEEE
28. Flame detector
E2101 IEEE
29. Isolating contactor
E2101 IEEE
30. Annunciator relay
E2101 IEEE
31. Separate excitationdevice
45 of 56
APPENDIX - 8
21.2 Device Function Numbers, Indicating The Device Function WhichCauses Relay Operate
E2101 IEEE
32. Directional powerrelay
E2101 IEEE
33. Position switch
E2101 IEEE
34. Master sequencedevice
E2101 IEEE
35. Brush-operating orslip-ring short-
circuiting deviceE2101 IEEE
36. Polarity orpolarizing voltage
device
E2101 IEEE
37. Undercurrent or under-power relay
E2101 IEEE
38. Bearing protectivedevice
E2101 IEEE
39. Mechanicalcondition monitor
E2101 IEEE
40. Field relay
E2101 IEEE
41. Field circuit breaker
E2101 IEEE
42. Running circuitbreaker
E2101 IEEE
43. Manual transfer orselector device
E2101 IEEE
44. Unit sequencestarting relay
E2101 IEEE
45. Atmospheric conditionmonitor
E2101 IEEE
46. Reverse-phase orphase-balancecurrent relay
E2101 IEEE
47. Phase-sequence orphase-balancevoltage relay
E2101 IEEE
48. Incomplete sequencerelay
E2101 IEEE
49. Machine ortransformer thermal
relay
E2101 IEEE
50. Instantaneous over-current relay
E2101 IEEE
51. AC time over-current relay
46 of 56
E2101 IEEE
52. AC circuit breaker
E2101 IEEE
53. Exciter or DCgenerator relay
E2101 IEEE
54. Turning gearengaging device
E2101 IEEE
55. Power factor relay
47 of 56
E2101 IEEE
56. Field applicationrelay
E2101 IEEE
57. Short-circuiting orgrounding device
E2101 IEEE
58. Rectification failurerelay
E2101 IEEE
59. Over-voltage relay
48 of 56
APPENDIX - 8
21.3 Device Function Numbers, Indicating The Device Function WhichCauses Relay Operate
E2101 IEEE
60. Voltage or currentbalance relay
E2101 IEEE
61. Density switch orsensor
E2101 IEEE
62. Time-delaystopping or
opening relay
E2101 IEEE
63. Pressure switch
E2101 IEEE
64. Ground detectorrelay
E2101 IEEE
65. Governor
E2101 IEEE
66. Notching orjogging device
E2101 IEEE
67. AC directionalover-current relay
E2101 IEEE
68. Blocking relay
E2101 IEEE
69. Permissive controldevice
E2101 IEEE
70. Rheostat
E2101 IEEE
71. Level switch
E2101 IEEE
73. Load-resistorcontactor
E2101 IEEE
74. Alarm relay
E2101 IEEE
75. Position changingmechanism
E2101 IEEE
76. DC over-currentrelay
E2101 IEEE
77. Telemetering device
E2101 IEEE
78. Phase-angle measuringrelay
E2101 IEEE
79. reclosing relay
E2101 IEEE
80. Flow switch
49 of 56
E2101 IEEE
81. Frequency relay
E2101 IEEE
82. DC load-measuringreclosing relay
E2101 IEEE
83. Automatic selectivecontrol or transfer
relay
E2101 IEEE
84. Operatingmechanism
E2101 IEEE
85. Carrier or pilot-wirerelay
E2101 IEEE
86. Lockout relay
E2101 IEEE
87. Differentialprotective relay
E2101 IEEE
88. Auxiliary motor ormotor generator
50 of 56
APPENDIX - 8
21.4 Device Function Numbers, Indicating The Device Function WhichCauses Relay Operate
E2101 IEEE
89. Line switch
E2101 IEEE
90. Regulating device
E2101 IEEE
91. Voltage directionalrelay
E2101 IEEE
92. Voltage and powerdirectional relay
E2101 IEEE
93. Field-changingcontactor
E2101 IEEE
94. Tripping or trip-freerelay
E2101 IEEE
95, 96, 97, 98, 99
Used only for specific applications in individualinstallations if none of the functions assigned to
the numbers from 1 to 94 is suitable
51 of 56
APPENDIX - 8
22. Building Electrical Installation (Light Switches)
E2201 ZADCO
5A, one way, single poleswitch to identify thenumber of gangs use:1G, 2G, 3G, and 4G
E2202 ZADCO
20/15A, one way, singlepole switch to identify thenumber of gangs use: 1G,
2G, 3G, and 4G
E2203 ZADCO
SA, two way, singlepole switch to identifythe number of gangsuse: 1G, 2G, 3G and
4G
E2204 ZADCO
20/15A two way,single pole switch to
identify the number ofgangs use: 1G, 2G, and
4GE2205 ZADCO
5A, intermediate wayswitch to identify thenumber of gangs use:1G, 2G, 3G, and 4G
E2206 ZADCO
20/15A, intermediate wayswitch to identify the
number of gangs use: 1G,2G, 3G, and 4G
E2207 ZADCO
Switch, period limiting
Empty
E2209 ZADCO
One way, double poleswitch
E2210 ZADCO
Metal clad one way, singlepole switch
E2211 ZADCO
Metal clad one way,double pole switch
E2212 ZADCO
Water tight single poleswitch
Empty
E2214 ZADCO
Pendant switch
E2215 IEC
Dimmer
E2216 ZADCO
13A switched socketout let
E2217 ZADCO
15A switched socketoutlet
E2218 ZADCO
Multiple switched socketout let
(e.g. 2 plugs)
E2219 ZADCO
110V switched socketoutlet
E2220 ZADCO
24V switched socketoutlet
52 of 56
E2221 ZADCO
Welding socket outlet
E2222 ZADCO
Switched fused spur unitwith outlet
E2223 ZADCO
Telephone socket outlet
E2224 ZADCO
TV socket outlet
E2226C ZADCO
Mirror light with shaveroutlet
E2226D ZADCO
2 Pole isolator
E2226E ZADCO
3 Pole isolator
E2226F ZADCO
3 Pole & neutralisolator
E2225 IEC
Plug
E2226 ZADCO
20A flex outlet
E2226A ZADCO
45A flex outlet
E2226B ZADCO
Shaver outletE2226G ZADCO
Switched fused spur unitwithout outlet
E2226H ZADCO
Fused spur unit withoutlet
E2226J ZADCO
Fused spur unit withoutoutlet
E2227 IEC
Electric bell
E2228 ZADCO
Bell push
E2229 ZADCO
Bell indicator N=NO. ofways
E2230 ZADCO
Bell transformer
E2231 IEC
Buzzer
E2232 ZADCO
Smoke detector
E2233 ZADCO
Heat detector
E2234 IEC
Fire alarm break glassunit
(manually operated)
E2235 ZADCO
Fire and gas controlpanel
53 of 56
E2236 ZADCO
Automatic fire detection
E2237 ZADCO
Self contained waterheater
E2238 ZADCO
Thermostat
E2239 ZADCO
Telephone junctionbox
Empty
E2241 ZADCO
Switch board / distributionboard fuse board
E2242 ZADCO
Exhaust fan wallmounted
E2243 ZADCO
Exhaust fan roofmounted
E2244 ZADCO
Fan regulator
E2245 ZADCO
Cooker control unit
E2246 ZADCO
Main distribution board
E2247 ZADCO
Ceiling fan
54 of 56
APPENDIX - 8
23. Electro Acoustic Elements
E2301 ZADCO
Microphone
E2302 ZADCO
Earphone
E2303 ZADCO
Loudspeaker
E2304 ZADCO
Two way intercomsystem
E2305 ZADCO
Pickup
E2306 ZADCO
Sound recorder
55 of 56
24 Cathodic Protection
E2401 ZADCO
Transformer rectifier
E2402 ZADCO
Current control box
E2403 ZADCO
Borehole grounded
E2404 ZADCO
Horizontal grounded
56 of 56
25. Hazardous Area Classification
EH02 API
Division 1
EH03 API
Division 2
EH04 API
Unclassified (SAFE)area
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