Light Wiring Diagrams

Ceiling rose

The ceiling rose, sometimes called a ‘loop-in ceiling rose’ or ‘3 plate ceiling rose’ is effectively a junction box for the power feed, switch wire and pendant flex of a ceiling light:

Ceiling rose with pendant attached

Ceiling rose with pendant attached

 

The ceiling rose has 3 sets of discreet terminals for the current carrying conductors plus an additional terminal for terminating the earthing conductors.

The diagram below shows the terminals in the ceiling rose plus typical termination of the cables:

Ceiling rose (new harmonised cable colours)

Ceiling rose (new harmonised cable colours)

 

 


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Multi-point radial lighting circuit (old cable colours)

If you are new to lighting circuits, this is a good place to start. Here we will explain how the most common lighting circuit works then we’ll move on to some variations that you may see in your home that may appear to differ from this.

N.B. The diagrams below shows the old cable colours. If the cables in your circuits are Brown and Blue please see Multi-point radial lighting circuit – new cable colours.

Fig 1 shows what is referred to as a radial circuit (sometimes called a ‘loop-in’ or ‘multi-point radial lighting circuit’).

multi point (loop-in) radial lighting circuit

Fig 1: multi point (loop-in) radial lighting circuit

The live feed from the Consumer unit (fuse board, shown in blue in Fig 1) feeds into the first ceiling rose (ceiling rose A, Fig 1). This would be cable A in the diagram below (Fig 2) which shows how the ceiling rose is terminated. This live feed now loops back out of the rose (cable B, Fig 2) and feeds power to the next ceiling light in the radial circuit (Ceiling rose 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 ceiling rose B (Fig 1), This is Cable A in the diagram below (Fig 3), which show how the last ceiling rose in the circuit is terminated.

Ceiling rose (old cable colours)

Fig 2: Ceiling rose (old cable colours)

Notice that each of the three ceiling roses in Fig 1 has, in addition to the power feeds, an additional cable that feeds down to the light switches (the switch wire). This the Cable C in fig 2 & Fig 3.

Radial circuit last ceiling rose (old colours)

Fig 3: Radial circuit last ceiling rose in the circuit (old colours)


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Multi-point radial lighting circuit (new cable colours)

If you are new to lighting circuits, this is a good place to start. Here we will explain how the most common lighting circuit works then we’ll move on to some variations that you may see in your home that may appear to differ from this.

N.B. The diagrams below shows the new (harmonised) cable colours. If the cables in your circuits are Red and Black please see Multi-point radial lighting circuit – old cable colours.

Fig 1 shows what is referred to as a radial circuit (sometimes called a ‘loop-in’ or ‘multi-point radial lighting circuit’).

multi point (loop-in) radial lighting circuit

Fig 1: multi point (loop-in) radial lighting circuit

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

Ceiling rose (new harmonised cable colours)

Fig 2: Ceiling rose (new harmonised cable colours)

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

Notice that each of the three ceiling roses in Fig 1 has, in addition to the power feeds, an additional cable that feeds down to the light switches (the switch wire). This the Cable C in fig 2 & Fig 3.

Radial circuit last ceiling rose (new harmonised colours)

Fig 3: Radial circuit last ceiling rose in the circuit (new harmonised colours)


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