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A Amp
CCT Circuit
CCU Cooker Control Unit
CCU Consumer Control Unit
CPC Circuit Protective Conductor
CPD Circuit Protective Device (MCB)
CU Consumer Unit
DB Distribution Board
EIC Electrical Installation Certificate
EEBADS 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
kV Kilovolt
kW Kilowatt
LV Low Voltage = 50V - 1000V AC \ 1500V Ripple Free DC
mA milliampere
MCB Miniature Circuit Breaker
MCCB Moulded Case Circuit Breaker
MD Maximum Demand
MEB Main Equipotential Bond (old term, see MPB)
MEW Minor Electrical Works (certificate)
MICC Mineral Insulated Copper Cable aka Pyro
MPB Main Protective Bond
PAT Portable Appliance Testing
PELV Protected Extra Low Voltage
PEN Protective Earthed Neutral
PFC Prospective Fault Current
PIR Periodic Inspection Report, or Passive Infra Red
PME Protective Multiple Earthing
PSCC Prospective Short Circuit Current
PVC Poly Vinyl Chloride
R Resistance
R1 Resistance of a phase conductor of a distribution or final circuit
R2 Resistance of a CPC of a distribution or a final circuit
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)
U Voltage between Phases
Uo Nominal Phase Voltage (to earth for TN systems)
Uoc Open circuit voltage at the supply transformer
UPS Uninterruptible Power Supply
V Volt
VD Voltage Drop
W Watt
Z Impedance
Ze Earth Fault Loop Impedance External to the installation
Zs Earth Fault Loop Impedance
Zdb Earth Fault Loop Impedance to the distribution board

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