Although a 5a junction box is suitable for a lighting circuit even if on a 6a circuit breaker it is generally much easier to use 20a types. Junction box wiring diagram connecting cables using a junction box creating a spur using a junction box if you want to spur off from a current circuit to provide power to a new socket of light again make sure the power is off and the circuit is isolated and wire your junction box using the method below.
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Junction box lighting circuit diagram. There are two basic methods of wiring lights by ceiling rose and by junction box. Systems using the ceiling roses make. One way lighting circuit using junction boxes. These are larger and have more space for the wires. Fig 2 the feed cable comes from a previous junction box or from the consumer unit the red black and earth wires are connected. Explanation of above picture.
The junction box should be wired as shown below. Line diagram of a one way lighting circuit using junction boxes fig 1. Wiring diagram of a one way lighting circuit using junction boxes fig 1. This would be cable a in the diagram below fig 2 which shows how the junction box is terminated. There is very little difference in price between the 5a and 20a types so there is no point in using the 5a ones unless the physical size of the box. 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.
Explanation of above picture. Fig 2 the feed cable comes from a previous junction box or from the consumer unit the red black and earth wires are connected to separate terminals. The junction box should be wired as shown below. The consumer unit is normally connected to the first lamp which in turn is connected to the second lamp and so on. Unlike the ring power circuit the lighting circuit does not form a loop returning to the consumer unit. This repeats for each light in the circuit until we reach the last light.
Gallery of Junction Box Lighting Circuit Diagram
