Unit 204

4. – A circuit that radiates out from the consumer unit.
6. – A circuit that starts and ends at the consumer unit.
7. – The minimum height for socket outlets above finished floor level.
10. – The coloured part of a BS 3036 fuse that indicates its rating.
11. – Type of lighting circuit wiring used in domestic installations.
12. – Device that melts to break a circuit when current exceeds a safe level.
13. – Protective device that detects earth leakage current.
14. – Protective device that uses thermal and magnetic effects to trip.
15. – The British Standard for circuit breakers used in domestic installations.
16. – The fuse standard used in plug tops.

1. – A switch used in a three-way lighting configuration.
2. – A spur that allows multiple sockets after it due to a fuse.
3. – The part of a fuse that melts during operation.
5. – The conductor that must be connected to the centre contact of an ES lamp holder.
8. – A circuit breaker type used in industrial settings with high inrush currents.
9. – The current that flows due to insulation faults.
12. – The maximum voltage drop allowed in a 230V installation.
13. – A device combining RCD and circuit breaker functions.
15. – UK standard for 3-pin plug and socket.