Fig 2 the feed cable comes from a previous junction box or from the consumer unit the red black and earth wires are connected. 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.
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Junction box lighting circuit diagram. Systems using the ceiling roses make. 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. Explanation of above picture. These are larger and have more space for the wires. Wiring diagram of a one way lighting circuit using junction boxes fig 1. One way lighting circuit using junction boxes.
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. Explanation of above picture. 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. The junction box should be wired as shown below. This would be cable a in the diagram below fig 2 which shows how the junction box is terminated. There are two basic methods of wiring lights by ceiling rose and by junction box.
Line diagram of a one way lighting circuit using junction boxes fig 1. 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 repeats for each light in the circuit until we reach the last light. 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.
Gallery of Junction Box Lighting Circuit Diagram
