combi boilers

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8 Jun 2007
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Leicester
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hi, does anybody know what size cable i need for my combi boiler. can i add it to my ring main with a spur. also what size mcb do i need...thanks a lot...rob
 
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ring main will already have an mcb

the answer depends on the current draw of your boiler
 
Most have an on board 1amp or 500ma fuse.

You can spur off the ring, fuse down with double pole isolation switch to 3 amp. Or you can create a new dedicated radial.

Some MI's allow use of an unswitched socket and plug, as to isolate you have to remove the plug which is effectively double pole isolation. But check MI's they overule everything.
 

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