Combi boiler MCB

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8 Nov 2008
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Wiltshire
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Hi can anyone please tell me what size MCB should be used for a combi boiler. thanks
 
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What size cable are you using?

Notification to LABC will be required too.
 
Personally I would fit a 10A or 6A MCB with a 1.5mm2 t&e, cable installation methods permitting.
Then fit a 3A BS1362 fuse in your DP switched fused spur.
 
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Do you really mean an MCB? So that is a new circuit just for the boiler.
You will need a switched FCU in any case as most boiler MI's say you must have a double switch to isolate the boiler.

Generally you'd just installa switched fused spur, at 3amp.
 

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