====== Abbreviations ======


^ 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 |