UK Electrical Glossary
The terms UK electricians actually use, defined in plain English — each linked to the topics and lessons where you practise them.
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- Consumer unitThe distribution board of a domestic installation.
- Continuity testingLow-resistance measurement proving that conductors which must be complete actually are.
- Correction factorsMultipliers applied to a cable's tabulated current rating to reflect how it is actually installed.
- CPCCircuit Protective Conductor
- Current-carrying capacityIz
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- R1+R2The combined resistance of a circuit's line conductor (R1) and its circuit protective conductor (R2), measured end-to-end during dead testing.
- Radial circuitA circuit that runs outward from the distribution board, feeding each point in turn, and simply ends at the last one — no return leg.
- RCBOResidual Current Breaker with Overcurrent protection
- RCDResidual Current Device
- Ring final circuitA socket circuit wired as a loop, so load current shares two paths.