Wiring A Switch Loop

To make a switch loop connect the incoming hot black wire to the white neutral wire that runs to the switch. This episode is something a lot of green apprentices need to watch.

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This is a loop in method which can be useful where the light fitting only has three terminals or when using downlighters.

Wiring a switch loop. At sw1 it is connected to one of the terminals. The neutral from the source is connected directly to the neutral terminal on the light and the source hot is spliced with the white loop wire. Switch loops work by stealing a hot that s in an attic or maybe in a light fixture box in the ceiling and sending that hot down to the switch on a white wire then sending the switched side black wire back up to that same box to turn a light fixture on.

Switch loops are very difficult to grasp when you re new to the trade and in this show i. A lot of older homes are wired this way. This circuit is wired with a 2 wire cable running from the light to the switch location.

The in cable supplies power from the previous light or consumer unit. Loop at the switch the principle is exactly the same as when looping at the ceiling rose or using a junction box. The white wire is marked black on both ends to identify it as hot.

Next the incoming white neutral wire is attached to the light fixture as usual and the black wire from the switch is connected to the light fixture. Mark the white wire at each end with black tape or black paint to indicate it is hot. The red wire going to the light switch is connected to the same terminal loop in as the red wire from the feed cable the black wire coming back from the switch is connected to the same terminal as the brown wire going to the lampholder live and the earth wire is connected to the same terminal as the earth wire from the feed cable.

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