CIRCUIT DIAGRAM SYMBOLS ELECTRICAL NETWORK ELEMENTS

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CIRCUIT DIAGRAM SYMBOLS ELECTRICAL NETWORK ELEMENTS
CIRCUIT DIAGRAM SYMBOLS ELECTRICAL NETWORK ELEMENTS

CIRCUIT DIAGRAM SYMBOLS

electrical network elements
three-phase line or cable
short circuit
single-phase line or cable
earth electrode
outgoing feeder
supply incoming feeder
resistor
variable resistor
reactor or transformer,
motor or generator winding
capacitor
iron core reactor
impedance (Z, R, L or C)
star-connected winding
delta-connected winding
varistor or surge arrester
spark gap or overvoltage
limiter
diode
thyristor
inverter
rectifier
source of current
metering
measuring device
switch disconnector
electrical power outlet
isolator
fuse
switch-fuse
circuit-breaker
circuit-breaker fitted with a
(thermal) overload and
(magnetic) short-circuit trip
relay
contactor
fuse contactor
drawout circuit-breaker
changeover switch
changeover circuit-breaker
transformer
transformer fitted with an
on-load tap changer
voltage transformer
artificial neutral or earthing
transformer
battery
current transformer
A.C. generator or
alternator
asynchronous generator
motor
abbreviations
– UPS    : uninterruptible power supply
– PIM    : permanent insulation monitor
– RCD    : residual current device
– IT    : unearthed neutral and earthed exposed conductive part
– N    : neutral
– NC    : normally closed
– NO    : normally open
– PE    : protective conductor
– PEN    : combined protective and neutral conductor
– Ph1, Ph2, Ph3 : phase 1, 2, and 3
– TN    : earthed neutral and neutral-connected exposed conductive part
– TNC    : earthed neutral, neutral-connected exposed conductive part, combined neutral and protective conductor
– TNS    : earthed neutral, neutral-connected exposed conductive part, separate neutral conductor and protective conductor
– TT    : earthed neutral and earthed exposed conductive part
– Z1//Z2: signifies that impedances Z1 and Z2 are in parallel.

CIRCUIT DIAGRAM SYMBOLS ELECTRICAL NETWORK ELEMENTS
CIRCUIT DIAGRAM SYMBOLS ELECTRICAL NETWORK ELEMENTS
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