13.Abbreviations and acronyms AutoCAD blocks

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.

I also suggest downloading Electric Symbols.

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Electric Symbols