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Radial Lighting Circuit Wiring. With reference to Table 523 of BS 7671 the minimum conductor size for a radial final circuit for lighting protected by an overcurrent protective device with a rated current or current setting In of 6 A is 10 mm2 for thermoplastic PVC or thermosetting insulated cables having copper conductors. It is simply a length of appropriately rated cable feeding one power point then possibly going on to the next.

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Unlike power circuits lighting circuits are always of the radial type. Lighting Circuits - Multiple Lights from One Switch. Loop-in lighting wiring is the modern cabling arrangements used in most installation.

A radial circuit is an electrical circuit where the feeders to each socket is taken directly from the consumer unit or distribution board DB or circuit Breaker CB like a 20A MCB.

Multi-point radial lighting circuit new cable colours Multi-point radial lighting circuit old cable colours Old multi-point radial lighting diagram using junction boxes. If there is a break anywhere along the cable all of the socket outlets after the break will no longer work. Radial or junction box wiring Picture 2 below shows a typical radial or junction box lighting system a two-core and earth cable runs from the consumer unit to a series of junction boxes - one for each lighting point ceiling rose. This does not include the light switches which should be wired in switch wire which contains 2 red cores.