How To Wire A Lighting Circuit Junction Box

Line diagram of a one way lighting circuit using junction boxes fig 1.

How to wire a lighting circuit junction box. Your electrical box or light switch should have a cable hole for you to insert one of the wire into. Once you find it you can push your wire through the hole and use fish tape to push your wire through the cable clamp and attach it to the junction box. Junction box wiring is often attached to electrical outlet or light fixture wiring. Electrical codes generally require that all electrical devices and the wiring connections to those devices must be enclosed in an approved electrical box often known as a junction box this metal or plastic box includes a cover to protect the wiring within and protect you from the wiring.

If you have to install a metal box however the ground wires of all cables in the box must connect to the ground screw on the box. The junction box should be wired as shown below. Fig 2 the feed cable comes from a previous junction box or from the consumer unit the red black and earth wires are connected. This rule is demonstrated nicely by wall switches receptacles and standard light fixtures all of.

An alternative method this uses the same wiring principles as the looped ceiling roses but here the connections are made in junction boxes rather than the ceiling rose. The junction box effectively replaces the ceiling rose. Explanation of above picture. Creating a spur using a junction box.

The national electrical code nec dictates that no wiring splices are allowed outside of an approved enclosure. Any standard outlet switch box or light fixture box can serve as an approved enclosure but where a wiring splice needs to occur in other locations along the circuit the approved enclosure is usually a junction box a junction box is simply a standard electrical box that is. If you re adding a junction box to an existing circuit it s often easier to use a plastic one and this type of j box doesn t need to be grounded. 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.

Wiring diagram of a one way lighting circuit using junction boxes fig 1. One way of providing for this is to install a four terminal junction box in which the cable from a light and the cable from its switch can be connected to the circuit cable. The reason why the wiring of a lighting circuit is more complex than a power circuit is that each outlet or light fitting needs to be controlled by a separate switch. Lighting circuits using junction boxes.

By making the splice in the. Explanation of above picture. One way lighting circuit using junction boxes. Junction box wiring diagram connecting cables using a junction box.