New Light for Lounge Ceiling - Advice needed on Wiring


Postby apexstag » Tue Mar 03, 2015 7:33 pm

Hi All

Got a new light for our lounge.

First pic is the current ceiling light, has green yellow x1, black x2, red x2 wires coming out of ceiling, then the current light attaches with blue and brown wires.
Image

Next pic is the new light, has a blue, brown and green/yellow wire going into a connector box, and the instructions say to insert corresponding wire into other side of connector box.
Image

Does that mean insert the black wires from ceiling and the earth wire from ceiling into the corresponding side of the connector box on the new fitting? but then it would leave two red wires doing nothing? I thought red was the old live wires?

I think I should take the new wires, unconnected them from the connector box, and put the blue & brown wires in where the current light is in the ceiling, and then attached the yellow/green wire to the earth terminal in the ceiling (with the other earth wire still in)?

what do you think!?
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Postby RobnDon » Thu Mar 05, 2015 10:33 am

The lighting has been wired using a loop in method.

This means that you have a twin and earth for live and neutral coming into the ceiling rose using one of the red and black cables. The second twin and earth is wired to the switch. The red taking the permanent live to the switch and the black bringing the switched live back to the light.

Ideally the switched live should have had some kind of marking on it to identify it as a live cable so as not to confuse it with a neutral.

You will need an extra connector for the red cables in order to make the light work correctly. Assuming that other than the markings not been on the switched live it is connected to the right terminal on your existing rose then this should be connected to brown on your new luminaire with the black going to the blue. Green/Yellow to green/yellow.

I would though recommend using a voltage tester and with the light switch in the off position test between the reds and blacks at your existing rose. Only the incoming cable should show as a voltage to give you your neutral.
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Postby ericmark » Fri Mar 06, 2015 2:34 pm

One black to brown other black to blue and earth green/yellow to other earth green/yellow. A separate connector is required to join the two reds together.

In theroy you should have a red sleeve on one of the black wires to show it is line not neutral it should in theroy be the one in the double connector on ceiling rose not the triple. But in practice it will not matter.
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