Cable size

aidan1979 · Posted: Thu Jul 20, 2006 1:19 pm Post Subject: Cable size

Hi Everyone

My lighting circuit is run on 1.5mm twin core and earth. However, I want to run 5 12v 50W spotlights (with transformers off JBs) in 1.0mm. Is it ok to do this or should I use 1.5mm?

Thanks

ban-all-sheds · Posted: Thu Jul 20, 2006 1:40 pm Post Subject:

What is the rating of the fuse/MCB on the lighting circuit?

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aidan1979 · Posted: Thu Jul 20, 2006 3:43 pm Post Subject:

its a 6 AMP MCB. I think the JBs are 20A ones.

ban-all-sheds · Posted: Thu Jul 20, 2006 4:34 pm Post Subject:

1mm² will be fine on a 6A breaker, and will be fine for the load of these lights.

Just to be squeaky clean you should document the fact that you've put 1mm² in the circuit in case some future occupant decides to up the rating of the MCB on the basis of the existing 1.5mm² that he can see at the CU....

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I mustn't warn people that the "experts" on the plumbing forum can't be trusted to tell the truth.

aidan1979 · Posted: Thu Jul 20, 2006 4:43 pm Post Subject:

Good point. Thanks a lot for your advice!