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Ask The Trades › DIY Forum › Electrical Questions › Wiring up a distribution box

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Wiring up a distribution box (Read 4259 times)

londonman

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Malvern
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Wiring up a distribution box
Jun 2^nd, 2017, 8:36am

Lighting circuits ...

can you have multiple circuits going into one MCB ? Retrofitting wiring as part of a renovation project and my electrician is telling me that only one circuit is allowed per MCB. Currently the house is wired with maybe 6 separate lighting feeds coming from three fuses.

I can understand (and will organise) separate circuits for downstairs and upstairs lights but if there were, say, three existing circuits for downstairs lights then surely they can all be put in the same MCB?

TIA

Would all Third Party Apologists kindly mind their own business .....

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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Wiring up a distribution box Reply #1 - Jun 2^nd, 2017, 8:46pm Nothing wrong with two or more cables in an MCB - It is no different from jointing from a joint box or other point. Neutrals must be in the same corresponding terminal. Some electricians get set in the old school ways, but there is nothing at all wrong with what you are suggesting.
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Wiring up a distribution box Reply #2 - Jun 3^rd, 2017, 10:34am +1 It can be more convenient to have separate MCB, one per circuit, but not essential.
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londonman Trade Member Offline I love YaBB 1G - SP1! Posts: 1697 Total Thanks: 13 For This Post: 0 Malvern United Kingdom Trade: Cabinet Maker	Re: Wiring up a distribution box Reply #3 - Jun 6^th, 2017, 7:13pm Mmm..my electrician is saying one circuit per MCB. Think it might be one of his 'foibles'.
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Wiring up a distribution box Reply #4 - Jun 7^th, 2017, 6:51am It is one circuit per MCB, but that doesn't mean a circuit cannot have two or three cables at the MCB. An MCB can be the joint just as much as a joint box a foot away. Indeed, the OSG even mentions a spur from a ring can be from the origin.
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