2. 2 of 56
Table of Contents
1. Current Systems, System Configurations And Protective Conductors .................................................... 3
2. Screening, Enclosure And Medium....................................................................................................... 5
3. Regulating Systems .............................................................................................................................. 6
4. Mechanical Controls............................................................................................................................. 7
5. Qualifying Symbols.............................................................................................................................. 8
6. Batteries, Semi-Conductors, Generators, Motors And Converters ........................................................ 10
7. Transformers, Reactors And Transductors........................................................................................... 12
8. Conductors, Lines And Cables............................................................................................................ 15
9. Overhead Line And Cable Accessories................................................................................................ 20
10. Terminals, Connections And Contact Elements................................................................................. 21
11. Resistors, Coils And Capacitors........................................................................................................ 22
12. Relay Coils And Contacts................................................................................................................. 23
13. Circuit Breakers, Contactors, Plugs, Sockets And Push Buttons......................................................... 26
14. Automatic Tripping Devices, Starting Equipment And Remote-Control Units.................................... 29
15. Switch-gear And Distribution Boxes ................................................................................................. 33
16. Protective Devices ............................................................................................................................ 34
17. Instruments And Metering Systems................................................................................................... 35
18. Lamp Fittings, Etc ............................................................................................................................ 38
19.Generating Stations And Substations (Planned).................................................................................. 41
20. Signaling Equipment And Clocks...................................................................................................... 42
21. Protection Relay Symbols................................................................................................................. 43
21.1 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 43
21.2 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 45
21.3 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 48
21.4 Device Function Numbers, Indicating The Device Function Which Causes Relay Operate ....... 50
22. Building Electrical Installation (Light Switches)................................................................................ 51
23. Electro Acoustic Elements................................................................................................................ 54
24 Cathodic Protection ........................................................................................................................... 55
25. Hazardous Area Classification .......................................................................................................... 56
3. 3 of 56
APPENDIX - 8
1. Current Systems, System Configurations And Protective
Conductors
E0101A IEC
Direct Current (DC)
E0102 IEC
Alternating current,
(AC) low freq. (power
or sub audio freq.)
E0103 IEC
Alternating current,
medium freq. (audio or
telephone freq.)
E0104 IEC
Alternating current, high
freq. (super audio, carrier
and radio freq.)
E0105 IEC
Direct or alternating
current (DC or AC)
symbol for equipment
for universal use
E0106 IEC
Rectified current with
alternating component
E0107 IEC
Alternating current of m
phases and frequency f
63B1 IEC
Three conductors within
one 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 winding
V-Connected (60o
)
E0115 IEC
Three-phase winding,
open-delta connected
4. 4 of 56
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 neutral
brought out.
E0119 IEC
Star-delta winding
configuration
E0120 IEC
Connection symbol, e.g.
of a primary delta-
secondary star-
connected, three-phase
transformer with clock
hour figure 11. Capital
letter for high voltage
winding
E0121 IEC
Three-phase winding,
three wire zig-zag or
interconnected star
E0122 IEC
Three-phase winding,
four wire zig-zag or
interconnected star, with
neutral 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 or
faults as used in short-
circuit calculations or
protective gear diagrams
E0128 IEC
Supply DC System
E0129 IEC
Supply DC System
positive
Negative
Mid-Wire
E0130 IEC
Earth (ground), general
E0131 IEC
Protective earth
(ground)
E0132 IEC
No Symbol
Protective conductor
and neutral conductor
combined
E0133 IEC
Noiseless (clean)
earth (ground)
E0134 IEC
Frame or chassis
E0135 IEC
Equipotentiality
5. 5 of 56
APPENDIX - 8
2. Screening, Enclosure And Medium
E0201 IEC
Enclosure, general
E0202A IEC
Screen (the screen may
be drawn in any
convenient shape)
Empty
E0203 IEC
Boundary line (any
combination of short
and long strokes)
E0204 IEC
Liquid material
E0205 IEC
Gaseous material
E0206 IEC
Insulation material
E0301 IEC
Variability, general
(non-inherent)
7. 7 of 56
APPENDIX - 8
4. Mechanical Controls
E0401A IEC
A/ General symbol
E0401B IEC
B/ For use in restricted
space
E0402 IEC
Locking device, padlock
facility
E0403 IEC
Devices for restricted
movement of a
mechanical link
(unblocked position)
E0404 IEC
Devices for restricted
movement of a
mechanical link
(unblocked position)
E0405 IEC
Mechanical interlock
between two devices
E0406 IEC
Automatic return
(e.g. spring return)
E0407 IEC
Non-automatic return
E0408 IEC
Manually operated
control, general
E0409 IEC
Manually operated
control 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 lever
E0416 IEC
Operated by roller
E0417 IEC
Operated by cam
E0418 IEC
Operated by crank
E0419 IEC
Operated by removable
handle
8. 8 of 56
APPENDIX - 8
5. Qualifying Symbols
E0503 IEC
Repeating 0 times
E0504 IEC
Rectilinear force or
motion in the direction
of the arrow
E0505 IEC
Bi-directional
pectilinear force or
motion
E0506 IEC
Uni-directional rotation
in the direction of the
arrow for example
clockwise
E0507 IEC
Bi-directional rotation
limited in both
directions
E0508 ZADCO
Start (on)
E0509 ZADCO
Stop (off)
E0510 IEC
Automatic release
function
E0511 IEC
Light-operated arrow
pointing towards symbol
light generating and/or
modulating arrows
pointing away from
symbols
E0512 IEC
Temperature
dependence
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 function
limit switch function
9. 9 of 56
E0519 IEC
Delayed action in the
direction of movement
from the arc towards its
center. (to be linked
with double line E0401
to the symbol of the
device)
E0520 IEC
Spring return function
E0521 IEC
Non-spring return
(stay put) function
E0522 IEC
Operating when the
characteristic value is
higher than the setting
value
E0523 IEC
Operating when the
characteristics value is
lower than the setting
value
E0524 IEC
Operating when the
characteristics value is
either higher than a
given high setting or
lower than a given low
setting
E0525 IEC
Operating when the
characteristic value
becomes zero
10. 10 of 56
APPENDIX - 8
6. Batteries, Semi-Conductors, Generators, Motors And
Converters
E0601 IEC
Primary cell or
accumulator (the long
line represents the
positive pole, the other
the negative)
E0602 IEC
Battery of accumulators or
primary 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 blocking
thyristor n-gate (anode
side controlled)
E0610 IEC
Reverse blocking thyristor
p-gate (cathode side
controlled)
E0611 IEC
Bi-directional thyristor
E0612 IEC
Transistor
PNP
E0613 IEC
Transistor
NPN
E0614 IEC
Machine general symbol.
The asterisk shall be
replaced by a letter
designation as follows:-
Motor(M), generator(G),
synchronous
Converter (c)
E0615 IEC
Machine capable of use
as motor or generator,
general
E0616 IEC
Mechanically coupled
machines, general
11. 11 of 56
E0617 ZADCO
Non rotary generator,
oscillator
E0618 IEC
Stator with two windings
E0619 IEC
Shunt winding or
separate winding
E0620 IEC
Series winding
E0621 IEC
Commutating or
compensating winding
E0622 IEC
Synchronous converter,
general
E0623 IEC
Power converter,
general the arrow is
optional
E0624 IEC
Rectifier, power
converter AC/DC
E0625 IEC
Inverter, power
converter DC/AC
E0626 IEC
DC Converter, power
converter DC/DC
E0627 IEC
Frequency changer,
power converter f1/f2
E0628 IEC
Static switch
E0629 IEC
Synchronous generator
(GS) or synchronous
motor (MS), three
phase, both leads of
each phase brought out
E0630 ZADCO
DC generator with
permanent magnet
excitation
E0631 IEC
Three phase induction
motor with slip ring
rotor
E0632 IEC
Three - phase induction
motor with squirrel -
cage rotor.
E0633 IEC
Three - phase induction
motor with squirrel -
cage rotor, all six
winding ends brought
out
12. 12 of 56
APPENDIX - 8
7. Transformers, Reactors And Transductors
E0701 IEC
Choke reactor, inductor,
winding
multi - line
representation
E0702 IEC
Ferro-magnetic core,
general
E0703 IEC
Ferro-magnetic core
with air gap, general
E0704 IEC
Winding of a
transformer, general
E0705 IEC
Transformer, single
phase with two separate
windings simplified
single line
representation
E0706 IEC
Transformer, single
phase with two separate
windings multi line
representation
E0707 IEC
Transformer with two
tappings single phase
simplified single line
representation
E0708 IEC
Transformer with two
tappings single phase
multi line representation
E0709 IEC
Auto-transformer, single
phase simplified single-
line representation
E0710 IEC
Auto-transformer, single
phase multi line
representation
E0711 IEC
Choke reactor, inductor,
winding simplified
single - line
representation
E0712 IEC
Inductor (reactor) with
Ferro-magnetic core
unless otherwise
indicated, general
multi line representation
E0713 IEC
Induction regulator,
single phase simplified
single - line
representation
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
13. 13 of 56
E0717 IEC
Current transformer
with two secondary
windings on one core
simplified single line
representation
E0718 IEC
Current transformer
with two secondary
windings on one core
multi line representation
E0719 IEC
Current transformer
with two cores
simplified single line
representation
E0720 IEC
Current transformer
with two cores multi
line representation
E0721 IEC
Voltage transformer
simplified 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 five
winding turns simplified
single line
representation
E0728 IEC
Current transformer,
where the primary
conductor forms five
winding turns multi line
representation
E0729 IEC
Current transformer
with three primary
windings simplified
single line
representation
E0730 IEC
Current transformer
with three primary
windings multi line
representation
E0736 ZADCO
Current transformer
surrounding three
conductors (core
balance) simplified
single line
representation
E0737 IEC
Current transformer
surrounding three
conductors (core
balance) multi line
representation
14. 14 of 56
E0731 IEC
Current transformer,
with one secondary
tapping (three leads
brought out) simplified
single - line
representation
E0732 IEC
Current transformer,
with one secondary
tapping (three leads
brought out) multi line
representation
E0733 IEC
Transductor element in
assembled
representation
E0734 IEC
Zig-Zag transformer
E0735 IEC
Tertiary winding
transformer
15. 15 of 56
APPENDIX - 8
8. Conductors, Lines And Cables
E0801 IEC
Conductor or group of
conductors, general
E0802 IEC
General symbol
denoting screening of
conductors
E0803 IEC
Conductors (n ×) within
one screen
E0804 IEC
Flexible conductor
E0805 IEC
General symbol
denoting twisting of
conductors
E0806 IEC
Conductors (n ×)
twisted
E0807 IEC
General symbol
denoting cable
E0808 IEC
Conductors (n ×) within
one cable
Empty
E0810 IEC
Underground line
E0811 IEC
Line not mounted in
sight
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, crossing
without electrical
connection
E0819 IEC
Junction of conductors
E0820 IEC
Double junction of
conductors
16. 16 of 56
E0821 IEC
Common connection to
a group of apparatus
(e.g. multipled or
looped)
E0822 IEC
Test point indicator
E0823 IEC
Conductor joint, in line
splice
E0824 IEC
Method of indicating
conductors data if the
marked wires lie in one
cable bundle or circuit
E0825 IEC
Method of indicating
data for each separate
wire or cable in one
bundle or channel
E0826 IEC
Method of indicating
data for each separate
wire or cable if more
than one cable is
represented by one line
E0827 IEC
Conductors dividing
E0828 IEC
Conductors dividing
E0829 IEC
Conductors dividing
E0830 IEC
Bundle of wires or
cables
E0831 IEC
Bundle of wires or
cables, crossing
E0832 IEC
Bundle of wires or
cables, dividing
E0833 IEC
Wiring or conductor
going upwards
E0834 IEC
Wiring or conductor
going downwards
E0835 IEC
Wiring or conductor
passing through
vertically
Empty
17. 17 of 56
Empty Empty
E0839 IEC
Coaxial pair, general
E0840 IEC
Coaxial pair with outer
conductor connected to
earth
E0841 IEC
Coaxial pair with screen
E0842 IEC
End of coaxial
conductor
E0843 IEC
Conductor or cable not
connected
E0844 IEC
Conductor or cable not
connected and
especially insulated
E0845 IEC
Four separate circuits or
conductors
E0846 IEC
Three phase circuit 50
Hz three conductors of
120mm2
and neutral of
50mm2
single -line
representation
E0847 IEC
Three phase circuit 50
Hz three conductors of
120mm2
and neutral of
50mm2
for multi-line
representation
E0848 IEC
Three phase circuit 50
Hz three conductors of
120mm2
and neutral of
50mm2
for multi-line
representation
E0849 IEC
Coaxial socket
E0850 IEC
Coaxial plug
E0851 IEC
Earth bar
E0852 ZADCO
Main plant earth
electrode
E0853 ZADCO
Supplementary earth
electrode
E0854 ZADCO
Equipment frame earth
connection
E0855 ZADCO
Earth cable on surface
E0856 ZADCO
Earth cable branch
connection
18. 18 of 56
E0857 ZADCO
Conduit laid in floor
screed
E0858 ZADCO
Conduit run on surface
E0859 ZADCO
Conduit concealed in
slab
E0860 ZADCO
Cable run on surface
E0861 ZADCO
Micc cable run on
surface
E0862 ZADCO
Cable tray
E0863 ZADCO
G.I / PVC trunking
E0864 ZADCO
Elect./Inst./Telecom.
cable in under ground
PVC duct
E0865 ZADCO
Under ground earth
cable in excavated
trench (Existing)
E0866 ZADCO
Under ground earth
cable in excavated
trench (proposed)
E0867 ZADCO
Earth cable in concrete
trench (existing)
E0868 ZADCO
Earth cable in concrete
trench (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 protective
and neutral conductor
E0876 IEC
Three-phase wiring with
neutral conductor and
protective conductor
19. 19 of 56
E0877 IEC
Three-phase and neutral
or three conductors and
neutral
E0878 IEC
Three-phase
or three conductors
E0879 IEC
Single-phase and neutral
or single conductor and
neutral
E0880 IEC
Two-phase or two
conductors
20. 20 of 56
APPENDIX - 8
9. Overhead Line And Cable Accessories
Empty
E0910 ZADCO
Conduit entry
E0911 ZADCO
Stuffing gland
E0912 IEC
Straight-through joint
box underground
E0913 IEC
Junction for three cables
underground
E0914 IEC
Junction for four cables
underground
E0915 IEC
Cable sealing end box
E0916 IEC
Branching box (e.g.
with four outlets)
21. 21 of 56
APPENDIX - 8
10. Terminals, Connections And Contact Elements
E1001 IEC
Terminal connections of
conductors, general
E1002 IEC
Terminal connections of
conductors, general
moveable contact
hinged
E1003 IEC
Terminal strip
E1004 ZADCO
Connection link with
bolted contacts
E1005A IEC
Connecting link, closed
E1005B IEC
Connecting link, open
E1006 IEC
Brush on commuter or
slip ring
E1007 ZADCO
Draw-out representation
of switch-gear
accessories
E1005A IEC
Mated Plug and socket
22. 22 of 56
APPENDIX - 8
11. Resistors, Coils And Capacitors
E1101 IEC
Resister
E1102 IEC
Resistor with fixed
tappings
E1103 IEC
Inductor, coil, winding,
choke
E1104 IEC
Shunt
E1105 IEC
Capacitor, capacity,
general
E1106 IEC
Polarized capacitor,
general
E1107 IEC
Polarized electrolytic
capacitor
E1108 IEC
Non-polarized
electrolytic capacitor
E1109 IEC
Chasis capacitor
E1110 IEC
Feed through capacitor
E1111 IEC
Code letters, indicating
type 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 with
inherent non-linear
character
E1114 IEC
Resistor with inherent
non-linear character
E1115 IEC
Resistor with inherent non-
linear character
E1116 IEC
Resistor with sliding
contact
E1117 IEC
Shunt / series capacitor
23. 23 of 56
APPENDIX - 8
12. Relay Coils And Contacts
E1201 IEC
CON= Contactor
IR = Interposing
Relay
CC = Closing coil
TC = Tripping Coil
K = Re-
Acceleration
E1202 IEC
Non-inductive winding
(bifilar)
E1203 IEC
Relay coil with one
winding
E1204 IEC
Relay coil with two
windings, separate
representation
E1205 IEC
Relay coil of a remnant
relay
E1206 IEC
Relay coil of a slow
releasing relay
E1207 IEC
Relay coil of a very
slow-releasing relay
E1208 IEC
Relay coil of slow-
operating relay
E1209 IEC
Relay coil of a very slow
operating relay
E1210 IEC
Relay coil of a high-speed
relay (fast-operating and
releasing)
E1211 IEC
Relay coil of a
polarized relay
E1212 IEC
Relay coil of an AC
relay
E1213 IEC
Relay coil of a relay un-
affected by alternating
current
E1214 IEC
Relay coil of a
mechanically latched relay
E1215 IEC
Relay coil of an
impulse, sequence
relay
E1216 IEC
Relay coil of a slow-
operating and slow
releasing relay
24. 24 of 56
E1217 IEC
Actuating device for a
thermal 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 two
breaks
E1224 IEC
Two way contact with
center-off position
E1225 IEC
Two-way contact with
center-off position with
spring return from the
left-hand position, but
not from the right-hand
one (stay put)
E1226 IEC
Passing make contact
closing momentarily when
its operating device is
actuated
E1227 IEC
Passing make contact
closing momentarily
when its operating
device is released
E1228 IEC
Passing make contact
closing momentarily
when its operating
device is actuated or
released
E1229 IEC
Make contact (of a
multiple contact
assembly) which is early
to operate relative to the
other contacts of the
assembly
E1230 IEC
Make contact (of a
multiple contact assembly)
which is late to operate
relative to the other
contacts of the assembly
E1231 IEC
Break contact
(of a multiple contact
assembly) which is
early to operate relative
to the other contacts of
the assembly
E1232 IEC
Break contact (of a
multiple contact
assembly) which is late
to operate relative to
the other contacts of
the assembly
E1233 IEC
Flasher, operated by an
actuating device of a
thermal relay
E1234 IEC
Make contact delayed
when closing
E1235 IEC
Break contact delayed
when closing
E1236 ZADCO
Break contact delayed
when opening
25. 25 of 56
E1236A ZADCO
Make contact delayed
when opening
E1237 IEC
Self operating thermal
break contact
E1238 IEC
Break contact of a
thermal relay
E1239 ZADCO
Change-over contact,
break before make of a
polarized relay
226C9 ZADCO
Single-pole, 4 position
switch with position
diagram
226C10 ZADCO
Single-pole, 6 position
switch with a wiper that
bridger only while passing
from one position to the
next
Empty Empty
26. 26 of 56
APPENDIX - 8
13. Circuit Breakers, Contactors, Plugs, Sockets And Push
Buttons
E1301 IEC
Switch
E1302 IEC
Change over switch,
break before make
E1303 IEC
Two way switch with
center-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 automatic
release
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 normally
closed
E1312 IEC
Contactor with
automatic release
E1313 IEC
3-position switch,
normally closed (only
opening when operated
to the left)
E1314 IEC
Mercury switch
E1315 IEC
Multi-pole plug and
socket isolator, N-pole
27. 27 of 56
E1316 IEC
Connector assembly
fixed portion
E1317 IEC
Connector assembly
movable portion
E1318 IEC
Mated connectors, plug
side fixed and socket
side movable
E1319 ZADCO
MCB (Miniature circuit
breaker with thermal &
magnetic protection)
E1320 ZADCO
MCCB (Mounded case
circuit breaker with
thermal & magnetic
over current protection)
E1320A ZADCO
RCCB (Restricted current
circuit breaker with
thermal & magnetic over
current protection and
earth leakage protection)
E1320B ZADCO
ELCB (Earth leakage
circuit breaker with earth
leakage protection)
E1321 ZADCO
Triple pole circuit
breaker e.g. air C.B
fitted with 3 thermal
over current relays and 3
thermo magnetic relays
E1322 ZADCO E1323 ZADCO E1324 IEC E1325 IEC
Earth Switch Rack draw-out type
circuit breaker (typical
for other draw-out
components)
Remote control unit,
rotary stack type with
spring return to neutral
position and padlock
facility
Manually operated
three-pole switch
1. Simplified single-
line representation
E1326 IEC
Manually operated
three-pole switch
2. Multi-line
reorientation
E1327 IEC
Push - Button
E1328 IEC
Push - button with
indicator lamp
E1329 IEC
Push - button with
restricted access (glass
cover, etc)
29. 29 of 56
APPENDIX - 8
14. Automatic Tripping Devices, Starting Equipment And
Remote-Control Units
E1401 IEC
Measuring relay or
related device, general
E1402 IEC
Measuring relay controlled
by two or more mutually
dependent 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)
30. 30 of 56
E1405-13 IEC
Time delay
E1405-14 IEC
Inverse time lag
characteristic
E1405-15 IEC
Thermal overload
(bimetal)
E1405-16 IEC
Electromagnetic
31. 31 of 56
E1405-17 IEC
Temperature
E1405-18 IEC
Pressure
E1405-19 IEC
Fluid level
E1405-20 IEC
Flow
E1405-21 IEC
Direction of energy flow
towards from bus bars
E1405-22 IEC
Direction of energy flow
away from bus bars
E1405-23 IEC
Bi-directional energy
flow
E1408 IEC
Blow out device coil
type
E1409 IEC
Blow out device
permanent magnet type
E1410 IEC
Starter, general (for use on
single-line diagrams)
E1411 IEC
Automatic starter
E1412 IEC
Automatic starter
E1413 IEC
Starter with automatic
release
E1414 ZADCO
Direct on-line contactor
starter with protective
device
E1415 IEC
Direct on line contactor
starter 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 unit
with ammeter
controlled by rotary
stack switch for use on
single line diagram
32. 32 of 56
E1421 ZADCO
Remote control unit
with ammeter controlled
by push buttons for use
on single line diagrams
E1422 ZADCO
Remote control unit as
E1420 & E1421, but for
use on layouts only
E1423 ZADCO
Remote control unit
without ammeter
controlled by rotary
stack switch for use on
single line diagrams
E1424 ZADCO
Remote control unit
without ammeter
controlled by push
buttons for use on
single line diagrams
E1425 ZADCO
Remote control unit as
E1423& E1424, but for
use on layouts only
E1426 ZADCO
Safety switch for use on
single line diagram
E1427 ZADCO
Safety switch for use
on layouts only
E1428 ZADCO
Emergency switch for
use on single line
diagrams
E1429 ZADCO
Emergency switch for
use on layouts only
E1430 ZADCO
Remote ammeter for use
on layouts only
E1431 ZADCO
Remote control unit
with push buttons for
use in P & ID’S
E1432 ZADCO
Remote control unit
with start/stop push
buttons and
local/remote selector
switch
33. 33 of 56
APPENDIX - 8
15. Switch-gear And Distribution Boxes
E1501 IEC
Switch gear, general
E1502 ZADCO
Control desk
E1503 IEC
Distribution center or
bus bars with incoming
and outgoing, circuits
E1504 IEC
Over-ground, weather-
proof enclosure, general
symbol pillar box
34. 34 of 56
APPENDIX - 8
16. Protective Devices
E1601 IEC
Fuse with supply side
indicated by thick line
E1602 IEC
Fuse with supply side
indicated by thick line
E1603 IEC
Fuse switch
E1604 IEC
Fuse disconnector (fuse
isolator)
E1605 IEC
Fuse switch
disconnector (on load
isolating fuse switch)
E1606 IEC
Fuse with mechanical
linkage (striker fuse)
E1607 IEC
Fuse with separate alarm
contact
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 discharge
tube
E1613 IEC
Link (closed)
E1614 IEC
Link (open)
36. 36 of 56
E1721 IEC
Thermal (hot wire)
instrument
E1722 IEC
Bimetallic instrument
E1723 IEC
Non-insulated
thermocouple, thermal
converter
E1724 IEC
Insulated thermocouple,
thermal converter
E1725 IEC
Accuracy class index,
e.g. 1.5 with errors
expressed as a
percentage of the true
valve
E1726 IEC
Test voltage above 500 v
e.g. 2kv (indication “0”
for apparatus not subject
to dielectric tests)
E1727 IEC
Instrument used with
the supporting surface
vertical
E1728 IEC
Instrument used with the
supporting surface
horizontal
Empty
E1730 IEC
Zero adjuster
E1731 IEC
Electronic device in
measuring circuit
E1732 IEC
Electronic device in
auxiliary circuit
E1733 IEC
Thermocouple, general
(the negative pole is
represented by the
thicker line)
E1734 IEC
Thermocouple, directly
heated, non-insulated
heating element
E1735 IEC
Thermocouple
indirectly heated
insulated heating
element
E1736 IEC
Instrument shunt
E1737 IEC
Amplifier
E1738 IEC
Single phase bridge
connected rectifier
Empty
37. 37 of 56
*
Note:
Terminologies for use in meters applicable to E1701, E1702, E1703
1. Ampere
2. Volt
3. Differential volt
4. Double volt
5. Watt
6. Watt-hour
7. Hertz
8. Synchroscope
9. Power-factor
10. Reactive volt-ampere hour
11. Volt-ampere hour
12. OHM
13. Hour
14. Direction indicator
15. Minute
16. Second
17. Time
18. Multiples and sub-multiples
Tera =1012
Giga = 109
Mega = 106
Kilo = 103
Mili = 103
Micro= 106
Nano= 109
Pico= 1012
19. Ammeter selector switch ZADCO
20. Voltmeter selector switch ZADCO
21. Selector switch ZADCO
22. Auto voltage regulator ZADCO
38. 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 lighting
luminaire on special
circuit
E1805 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 adjacent
to the symbol e.g.
RD - redBU-blue YE-yellow
WH-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 to
the symbol:
Ne-neon
Xe-xenon
Nq-sodium vapour
Hg-mercury
I-iodine
IN-incandescent
EL-electroluminescent
ARC-fluorescent
FL-fluorescent
IR-infra-red
UV-ultra-violet
LED-light-emitting diode
39. 39 of 56
Empty
E1810 ZADCO
Suspended incandescent
light fitting
E1811 ZADCO
Wall mounted
incandescent light fitting
E1812 IEC
Fluorescent lamp,
general symbol
E1813 IEC
Luminaries with two
fluorescent tubes
E1813A ZADCO
Luminaries with five
fluorescent tubes
E1814 IEC
Fluorescent lamp on
special circuit, e.g.
emergency circuit
E1815 IEC
Spot light
E1816 IEC
Flood light
E1817 ZADCO
Flood light mounted on
lighting mast
E1818 IEC
Navigation lamp
E1819 IEC
Electrical appliance
E1820 IEC
Heating element (e.g
from heater)
E1821 IEC
Signal lamp, flashing type
E1822 IEC
Auxiliary apparatus for
discharge lamp
(e.g. ballast)
E1823 IEC
Light dependent resistor
photo-conductive
device with
symmetrical
conductivity
E1824 IEC
Photodiode
photo-conductive device
with asymmetrical
conductivity
E1825 IEC
Optical coupling device
opto isolator shown with
light emitting diode and
photo-transistor
E1826 IEC
Emergency lighting with
battery back-up
E1827 ZADCO
Fluorescent lamp with
battery back-up
40. 40 of 56
E1828 ZADCO
Bulkhead light fitting
E1829 ZADCO
Lighting pole
E1830 ZADCO
Lighting pole
41. 41 of 56
APPENDIX - 8
19.Generating Stations And Substations
E1901 IEC
Generating station
(power plant), general
E1902 IEC
Generating station, oil or
gas
E1903 IEC
Generating station,
thermo-electric
E1904 IEC
Generating station
hydro-electric
E1905 IEC
Generating station oil or
gas 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 or
gas
E1913 IEC
Generating station,
thermo-electric
E1914 IEC
Generating station
hydro-electric
E1915 IEC
Generating station oil or
gas with gas turbine
E1916 IEC
Substation, general (e.g.
intake station)
E1917 IEC
Plant station
E1918 IEC
Rectifier substation
42. 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, general
E2005 IEC E2006 IEC E2007 IEC E2008 IEC
Electromechanical
position indicator with
one de-energized and
two operating positions
Electro mechanical
indicator with alarm con
tact
Clock, general Master clock
E2009 IEC E2010 IEC E2011 IEC E2012 ZADCO
Time - switch Synchronous clock (e.g. 50
HZ)
Clock with an electric
motor rewind
Drop enunciator make
contact actuated by the
actuating system, make
contact actuated by the
target
E2013 IEC
Mechanical indicator
E2014 IEC
Common alarm indication
43. 43 of 56
APPENDIX - 8
21. Protection Relay Symbols
21.1 Device Function Numbers, Indicating The Device Function Which
Causes Relay Operate
E2101 IEEE
1. Master element
E2101 IEEE
2. Time-delay starting or
closing relay
E2101 IEEE
3. Checking or
interlocking relay
E2101 IEEE
4. Master contactor
E2101 IEEE
5. Stopping device
E2101 IEEE
6. Starting circuit
breaker
E2101 IEEE
7. Rate-of-change relay
E2101 IEEE
8. Control power
disconnecting device
E2101 IEEE
9. Reversing device
E2101 IEEE
10. Unit sequence
switch
E2101 IEEE
11. Multifunction device
E2101 IEEE
12. Over-speed device
E2101 IEEE
13. Synchronous-speed
device
E2101 IEEE
14. Under-speed device
E2101 IEEE
15. Speed or frequency
matching device
E2101 IEEE
16. Reserved for future
application
E2101 IEEE
17. Shunting or
discharge switch
E2101 IEEE
18. Accelerating or
decelerating device
E2101 IEEE
19. Starting-to-running
transition contactor
45. 45 of 56
APPENDIX - 8
21.2 Device Function Numbers, Indicating The Device Function Which
Causes Relay Operate
E2101 IEEE
32. Directional power
relay
E2101 IEEE
33. Position switch
E2101 IEEE
34. Master sequence
device
E2101 IEEE
35. Brush-operating or
slip-ring short-
circuiting device
E2101 IEEE
36. Polarity or
polarizing voltage
device
E2101 IEEE
37. Undercurrent or under-
power relay
E2101 IEEE
38. Bearing protective
device
E2101 IEEE
39. Mechanical
condition monitor
E2101 IEEE
40. Field relay
E2101 IEEE
41. Field circuit breaker
E2101 IEEE
42. Running circuit
breaker
E2101 IEEE
43. Manual transfer or
selector device
E2101 IEEE
44. Unit sequence
starting relay
E2101 IEEE
45. Atmospheric condition
monitor
E2101 IEEE
46. Reverse-phase or
phase-balance
current relay
E2101 IEEE
47. Phase-sequence or
phase-balance
voltage relay
E2101 IEEE
48. Incomplete sequence
relay
E2101 IEEE
49. Machine or
transformer thermal
relay
E2101 IEEE
50. Instantaneous over-
current relay
E2101 IEEE
51. AC time over-
current relay
46. 46 of 56
E2101 IEEE
52. AC circuit breaker
E2101 IEEE
53. Exciter or DC
generator relay
E2101 IEEE
54. Turning gear
engaging device
E2101 IEEE
55. Power factor relay
47. 47 of 56
E2101 IEEE
56. Field application
relay
E2101 IEEE
57. Short-circuiting or
grounding device
E2101 IEEE
58. Rectification failure
relay
E2101 IEEE
59. Over-voltage relay
48. 48 of 56
APPENDIX - 8
21.3 Device Function Numbers, Indicating The Device Function Which
Causes Relay Operate
E2101 IEEE
60. Voltage or current
balance relay
E2101 IEEE
61. Density switch or
sensor
E2101 IEEE
62. Time-delay
stopping or
opening relay
E2101 IEEE
63. Pressure switch
E2101 IEEE
64. Ground detector
relay
E2101 IEEE
65. Governor
E2101 IEEE
66. Notching or
jogging device
E2101 IEEE
67. AC directional
over-current relay
E2101 IEEE
68. Blocking relay
E2101 IEEE
69. Permissive control
device
E2101 IEEE
70. Rheostat
E2101 IEEE
71. Level switch
E2101 IEEE
73. Load-resistor
contactor
E2101 IEEE
74. Alarm relay
E2101 IEEE
75. Position changing
mechanism
E2101 IEEE
76. DC over-current
relay
E2101 IEEE
77. Telemetering device
E2101 IEEE
78. Phase-angle measuring
relay
E2101 IEEE
79. reclosing relay
E2101 IEEE
80. Flow switch
49. 49 of 56
E2101 IEEE
81. Frequency relay
E2101 IEEE
82. DC load-measuring
reclosing relay
E2101 IEEE
83. Automatic selective
control or transfer
relay
E2101 IEEE
84. Operating
mechanism
E2101 IEEE
85. Carrier or pilot-wire
relay
E2101 IEEE
86. Lockout relay
E2101 IEEE
87. Differential
protective relay
E2101 IEEE
88. Auxiliary motor or
motor generator
50. 50 of 56
APPENDIX - 8
21.4 Device Function Numbers, Indicating The Device Function Which
Causes Relay Operate
E2101 IEEE
89. Line switch
E2101 IEEE
90. Regulating device
E2101 IEEE
91. Voltage directional
relay
E2101 IEEE
92. Voltage and power
directional relay
E2101 IEEE
93. Field-changing
contactor
E2101 IEEE
94. Tripping or trip-free
relay
E2101 IEEE
95, 96, 97, 98, 99
Used only for specific applications in individual
installations if none of the functions assigned to
the numbers from 1 to 94 is suitable
51. 51 of 56
APPENDIX - 8
22. Building Electrical Installation (Light Switches)
E2201 ZADCO
5A, one way, single pole
switch to identify the
number of gangs use:
1G, 2G, 3G, and 4G
E2202 ZADCO
20/15A, one way, single
pole switch to identify the
number of gangs use: 1G,
2G, 3G, and 4G
E2203 ZADCO
SA, two way, single
pole switch to identify
the number of gangs
use: 1G, 2G, 3G and
4G
E2204 ZADCO
20/15A two way,
single pole switch to
identify the number of
gangs use: 1G, 2G, and
4G
E2205 ZADCO
5A, intermediate way
switch to identify the
number of gangs use:
1G, 2G, 3G, and 4G
E2206 ZADCO
20/15A, intermediate way
switch to identify the
number of gangs use: 1G,
2G, 3G, and 4G
E2207 ZADCO
Switch, period limiting
Empty
E2209 ZADCO
One way, double pole
switch
E2210 ZADCO
Metal clad one way, single
pole switch
E2211 ZADCO
Metal clad one way,
double pole switch
E2212 ZADCO
Water tight single pole
switch
Empty
E2214 ZADCO
Pendant switch
E2215 IEC
Dimmer
E2216 ZADCO
13A switched socket
out let
E2217 ZADCO
15A switched socket
outlet
E2218 ZADCO
Multiple switched socket
out let
(e.g. 2 plugs)
E2219 ZADCO
110V switched socket
outlet
E2220 ZADCO
24V switched socket
outlet
52. 52 of 56
E2221 ZADCO
Welding socket outlet
E2222 ZADCO
Switched fused spur unit
with outlet
E2223 ZADCO
Telephone socket outlet
E2224 ZADCO
TV socket outlet
E2226C ZADCO
Mirror light with shaver
outlet
E2226D ZADCO
2 Pole isolator
E2226E ZADCO
3 Pole isolator
E2226F ZADCO
3 Pole & neutral
isolator
E2225 IEC
Plug
E2226 ZADCO
20A flex outlet
E2226A ZADCO
45A flex outlet
E2226B ZADCO
Shaver outlet
E2226G ZADCO
Switched fused spur unit
without outlet
E2226H ZADCO
Fused spur unit with
outlet
E2226J ZADCO
Fused spur unit without
outlet
E2227 IEC
Electric bell
E2228 ZADCO
Bell push
E2229 ZADCO
Bell indicator N=NO. of
ways
E2230 ZADCO
Bell transformer
E2231 IEC
Buzzer
E2232 ZADCO
Smoke detector
E2233 ZADCO
Heat detector
E2234 IEC
Fire alarm break glass
unit
(manually operated)
E2235 ZADCO
Fire and gas control
panel
53. 53 of 56
E2236 ZADCO
Automatic fire detection
E2237 ZADCO
Self contained water
heater
E2238 ZADCO
Thermostat
E2239 ZADCO
Telephone junction
box
Empty
E2241 ZADCO
Switch board / distribution
board fuse board
E2242 ZADCO
Exhaust fan wall
mounted
E2243 ZADCO
Exhaust fan roof
mounted
E2244 ZADCO
Fan regulator
E2245 ZADCO
Cooker control unit
E2246 ZADCO
Main distribution board
E2247 ZADCO
Ceiling fan
54. 54 of 56
APPENDIX - 8
23. Electro Acoustic Elements
E2301 ZADCO
Microphone
E2302 ZADCO
Earphone
E2303 ZADCO
Loudspeaker
E2304 ZADCO
Two way intercom
system
E2305 ZADCO
Pickup
E2306 ZADCO
Sound recorder
55. 55 of 56
24 Cathodic Protection
E2401 ZADCO
Transformer rectifier
E2402 ZADCO
Current control box
E2403 ZADCO
Borehole grounded
E2404 ZADCO
Horizontal grounded
56. 56 of 56
25. Hazardous Area Classification
EH02 API
Division 1
EH03 API
Division 2
EH04 API
Unclassified (SAFE)
area
