Sign
and Symbol
|
Name |
Symbol |
Name |
Symbol |
|
Direct
current |
 |
Lamp |
 |
|
Positive |
+ |
Lamp
in series |
 |
|
Negative |
- |
Lamp
in parallel |
 |
|
Alternating
current |
 |
Two
pin socket |
 |
|
Phase |
P |
Three
pin socket |
 |
|
Neutral |
N |
Fan |
 |
|
Single
phase |
 |
Indicator |
|
|
Three
phase |
 |
Two
plate ceiling rose |
|
|
Phase
sequence |
R Y B |
Electric
bell |
 |
|
Crossed
wire |
 |
Electric
buzzer |
 |
|
Connected
wire |
 |
Double
pole switch |
 |
|
Earth |
 |
Triple
pole switch |
 |
|
Fuse
(re-wire able) |
 |
Double
pole iron clad main switch |
 |
|
Cartridge
fuse |
 |
Fixed resistance |
 |
|
Neutral
link |
 |
Variable
resistance |
 |
|
Single
pole one way switch |
 |
Coil
or inductor (fixed) |
 |
|
Single
pole two way switch |
 |
Coil
or inductor (variable) |
 |
|
Push
button switch |
 |
Choke
coil |
 |
|
Intermediate
switch |
 |
Fixed
condenser or capacitor |
 |
|
Cell |
 |
Variable
condenser or capacitor |
 |
|
Battery |
 |
Power
factor meter |
 |
|
Ampere
meter or am meter |
  |
Frequency
meter |
 |
|
Volt
meter |
  |
Galvanometer |
 |
|
Ohm
meter |
 |
Transformer |
 |
|
Wattmeter |
  |
Auto
transformer |
 |
|
Multi
meter |
 |
Aerial |
 |
|
Siren |
 |
Horn
or hooter |
 |
|
Moving
coil |
 |
Moving
iron |
 |
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