Electrical Symbols & Abbreviations
The electrical symbols displayed here are some of the most commonly used in electrical science and electrical diagrams.
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| GENERAL SWITCH (N/O) |
SINGLE CELL BATTERY | GENERAL SWITCH (N/C) |
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| LAMP | AMETER | VOLTMETER |
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| RELAY with switches | CONTACTOR with contacts | MOTOR |
Electrical Abbreviations
CCT - Circuit
CCU - Cooker Control Unit
CPC - Circuit Protective Conductor
CU - Consumer Unit
EEBAD - Earthed Equipotential Bonding And Automatic Disconnection Of Supply
ELV - Extra Low Voltage = Below 50V AC \ 120V Ripple Free DC
FCU - Fused Connection Unit
FELV - Functional Extra Low Voltage
HBC - High Breaking Capacity
HRC - High Rupturing Capacity
HV - High Voltage
Ib - Design current of cable
In - Overcurrent device rating
Iz - Prospective fault current
LV - Low Voltage = 50V - 1000V AC \ 1500V DC
MCB - Miniature Circuit Breaker
MCCB - Moulded Case Circuit Breaker
MD - Maximum Demand
MICC - Mineral Insulated Copper Cable aka Pyro
PAT - Portable Appliance Testing
PELV - Protected Extra Low Voltage
PEN - Protective Earthed Neutral
PFC - Prospective Fault Current
PME - Protective Multiple Earthing
PSCC - Prospective Short Circuit Current
PVC - Poly Vinyl Chloride
RCBO - Residual Current Breaker With Integral Overload Protection
RCCB - Residual Current Circuit Breaker
RCD - Residual Current Device
SELV - Separated Extra Low Voltage
SRCBO's - Socket Outlet Incorporating RCBO's
SWA - Steel Wire Armour Cable
UPS - Uninterruptible Power Supply
VD - Voltage Drop
A - Amp
W - Watt
V - Volt
R - Resistance
Z - Impedance
Ze- External loop Impedence
Zs- Combined external and internal Loop impedence
mA - milliampere
mV - millivolt
kW - Kilowatt
kV - Kilovolt
The electrical abbreviations above is applicable to the United Kingdom and 17th Edition IEE wiring regulations BS7671.
-www.HowToWire.co.uk- is purely for electrical guidance and advice.
