IT1 U14 - Wiring Systems - Complete

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CGLI 2330 Certificate in Electrotechnical Technology Level 2 Inst Tech: Unit 202 – Principles of Electrotechnology

Unit 14 – Wiring Systems

Wiring Systems Unit Aims By the end of the unit participants should be able to: Identify appropriate wiring systems, enclosures and equipment with reference to the a) use of single and three phase power systems b) installation of lighting circuits c) use of radial and ring circuits Syllabus Reference: 2.3.02

Wiring Systems There are many standard circuits in use in electrical installation work covering lighting heating and power with supplies either being single phase or three phase. A brief description of these follows.

Lighting Circuits Lighting Circuits - Points to Note All lighting points, unless specific light sources with known power ratings are being used, are assumed to have a rating of 100 watts minimum. To ensure there is not a complete black out when a fault occurs, we should install at least two lighting circuits in premises. Earthing terminal and c.p.c. must be provided at ALL lighting points including switches and ceiling roses. 5/6 amp protective devices are usually used to protect domestic lighting circuits (5 amp if BS 3036 semi-enclosed rewireable fuse; 6 amp if a circuit breaker). Domestic lighting circuits are generally wired in 1.0mm2 or 1.5mm2 cables. Two types of wiring system are used for lighting circuits: Two-Plate System: Used where single core cables are used, e.g. in conduit and trunking systems. Three-Plate System: Used where multi core cables are used, e.g. domestic installations using twin and earth.

The College At Clacton

Unit 14 Page 1

March 2012


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