Light Wiring Diagrams

New junction box radial circuit diagrams added

We have just added additional circuit diagrams to the two way switching page.

This particular page shows two way switching in the old cable colours linking to a looped radial circuit that uses ceiling roses. As some older houses with these old cable colours may have looped radial circuits utilising junction boxes we have added an additionl circuit diagram that shows this. Check it out here:

Two way switching with junction box looped radial (old cable colours)

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Old multi-point radial lighting diagram using junction boxes

Fig 1 shows what is referred to as a radial circuit (sometimes called a ‘loop-in’ or ‘multi-point radial lighting circuit’). which uses junction boxes instead of ceiling roses. You may find this wiring arrangement in older properties.

N.B. The diagrams below shows the old cable colours as you are unlikely to find this approach taken in a modern property which would use the new ‘harmonised’ cable colours.

If your lighting circuit has all the cables terminate in ceiling roses rather than junction boxes, please refer to one of the following instead:

Multi-point radial lighting circuit with new cable colours (harmonised) or

Multi-point radial lighting circuit (old cable colours)

Multi-point radial lighting circuit using junction boxes

Fig 1: Multi-point radial lighting circuit using junction boxes

The live feed from the Consumer unit (fuse board, shown in blue in Fig 1) feeds into the first junction box (junction box A, Fig 1). This would be cable A in the diagram below (Fig 2) which shows how the junction box is terminated. This live feed now loops back out of the junction box (cable B, Fig 2) and feeds power to the next ceiling light in the radial circuit (junction box B, Fig 1). This repeats for each light in the circuit until we reach the last light.

Once we reach the last light, you can see that there is only The feed from junction box B (Fig 1), This is Cable A in the diagram below (Fig 3), which shows how the last junction box in the circuit is terminated.

Junction box wiring for looped radial lighting circuit

Fig 2: Junction box wiring for looped radial lighting circuit

Notice that each of the three junction boxes in Fig 1 has, in addition to the power feeds, an additional cable that feeds down to the light switches (the switch wire). This is Cable C in fig 2 & Fig 3. Cable D (Fig 2 and Fig 3) is the feed to the light fitting.

Junction box termination for the end of a radial lighting circuit

Fig 3: Junction box termination for the end of a radial lighting circuit


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