| Abbreviation | Meaning |
|---|
| 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 |
