16.Electrical General Symbols AutoCAD Blocks

plug and socket for plug in switchgears
plug and socket for withdrawable switchgears
normally open links
removable links
frame/chassis earth symbol
earth potential
meter selector switch
indicator lamp
neutral conductor symbol
three phase circuit
single phase circuit
terminal block
earth conductor symbol
submain tee-off unit
battery
fused tee-off
number of parallel run circuit symbol
resistor – general symbol
flag indication for relay
c = emergency power off indicator
s = non-auto shunt trip
indication for contact or switch
on-load fuse isolator (3 phase)
off-load fuse isolator (3 phase)
fuse switch (3 phase)
on-load fuse isolator
off-load fuse isolator
terminal sockets with isolating link
male terminal plug
female terminal socket
terminal link – with test socket
terminal link – with test socket
terminal link
fuse switch – general symbol
photo-electric cell
un-interrupted power supply
horn
siren
indicator or signal lamp – flashing type
indicator or signal lamp – steady type
light emitting diode (led)
fuse
general symbols
interlock symbol
surge_arrestor
diode
buzzer
cable marker

I also suggest downloading Electric Symbols.

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Electric Symbols