spur from a lighting ring

[symonbrum]

I need to create a socket from a through wall into a garage which has only one existing electrical socket which is already spurred. There is however an accessible cable close by leading to the light switch for the garage. Can I spur from here using a 30a JB? I have it in my head that I can't but don't know why. If not what options do I have?

[breezer]

symonbrum wrote:

There is however an accessible cable close by leading to the light switch for the garage. Can I spur from here using a 30a JB?

It looks like you are saying you want to put a soket on a cable that you know goes to a light switch?

I am happy to say thankyou for asking, but the answer is that you should get 3 quotes from electricians to do the job, as the to do the job will be breaking part p (try a search) and judguing by your question you have no idea about electrical wiring and its principals

__________________
Do you like music Mr Finch?
Forum = Opinions

[felix]

Leaving part P aside for the moment, there are reasons other than fickle political whim why you can't do it.

For a start, you are highly unlikely to find a neutral wire leading to a light switch. What you will most likely find is a flat twin and earth cable in which the black wire is switched live, not neutral. If you connect a socket across these two, nothing much will happen - until you try to use the socket. The light will come on and whatever you plugged in won't work properly.

Even if you follow that wire back to a its light fitting or junction box where there will be a real neutral, putting a socket on a lighting circuit is a bad idea because they are only rated at five amps - or six if you're lucky. Every time somebody tries to use that socket for something big, like a washing machine for example, the fuse in the consumer unit will blow and lots of lights will go out.

Your new socket should, like the other one, be spurred off a 30 amp circuit. If you can't figure out how to do this then take Breezer's advice and find somebody who can.