LIGHTS

[mola]

I HAVE 3 CABLES COMING FROM MY CEILING 3 RED 3 BLACK & 3 GREEN I WANT TO CONNECT TO NEW LIGHT I didnt MARK UP WHEN DISCONNECTED IS THERE ANY EASY WAY OF FINDING OUT WHICH WIRES GO TOGETHER OR DO I KEEP TRYING BY MIXING AROUND AND DIFFERENT LIGHTS COMING ON OR NOT

[breezer]

do thast and when it goes bang you know its wrong.

get a meter asnd find out what does what.

and please
turn it off

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Forum = Opinions

[Electroserve]

Turn you power supply off to the lights and take off the light switch there will be a black and red cable, place the black cable into a connector block with the earth(green/yellow) cable, using a multi meter test at the fitting between all black cables and earth(green/yellow), till you find continuity between this cable is most likely to be your switched live mark it with red or brown tape. and connect it into live on its own

[Spark123]

electrics:lighting:problems:blackswlive

[GaryMo]

Electroserve wrote:

Turn you power supply off to the lights and take off the light switch there will be a black and red cable, place the red cable into a connector block with the earth(green/yellow) cable, using a multi meter test at the fitting between all black cables and earth(green/yellow), till you find continuity between this cable is most likely to be your switched live mark it with red or brown tape. and connect it into live on its own

Or check continuity between each set of red and black whist turning the switch on and off.
Much easier than disconnecting anything

Also, you mention connecting the red and earth together but checking continuity between blacks and earth. Typo?

[Electroserve]

GaryMo wrote:

Electroserve wrote: Turn you power supply off to the lights and take off the light switch there will be a black and red cable, place the red cable into a connector block with the earth(green/yellow) cable, using a multi meter test at the fitting between all black cables and earth(green/yellow), till you find continuity between this cable is most likely to be your switched live mark it with red or brown tape. and connect it into live on its own Or check continuity between each set of red and black whist turning the switch on and off. Much easier than disconnecting anything Also, you mention connecting the red and earth together but checking continuity between blacks and earth. Typo?

Cheers for pointing that one out

[TicklyT]

Electroserve wrote:

GaryMo wrote: Electroserve wrote: Turn you power supply off to the lights and take off the light switch there will be a black and red cable, place the red cable into a connector block with the earth(green/yellow) cable, using a multi meter test at the fitting between all black cables and earth(green/yellow), till you find continuity between this cable is most likely to be your switched live mark it with red or brown tape. and connect it into live on its own Or check continuity between each set of red and black whist turning the switch on and off. Much easier than disconnecting anything Also, you mention connecting the red and earth together but checking continuity between blacks and earth. Typo? Cheers for pointing that one out

Would you find continuity between neutral and CPC from the CU (depending on the earthing arrangements) as well?

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[GaryMo]

TicklyT wrote:

Would you find continuity between neutral and CPC from the CU (depending on the earthing arrangements) as well?

Yes (TNC-S (PME)), on the loop in neutral and earth. That will eliminate one t&e, still two more to go (loop out and switch wire).
We're talking about switch feed (red) and switch wire (black).
As I said, best way is to check for continuity between each set of red and black whilst operating the switch. That way you'll determine which black is the switch wire.