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EF: Maximum demand exceeding main fuse.

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EF: Maximum demand exceeding main fuse.

B

Bobble23

Maximum demand exceeding main fuse.

I've got a customer who currently has a 60A main fuse running in 10mm tails to a board with breakers 32/32/20/6/6A which, doing the diversity calc at biggest breaker + 40% of the rest comes in at 57.6A, just about OK.

She wants a new 32A cooker circuit, so I said she should get the tails upgraded and the main fuse increased, but this would involve pulling up her newly-varnished floor so she's said no.

If I was to down-rate the breakers to 32 (for the new circuit) then 20/20/16/6/6 the calc. still comes in at less than 60A (59.2). Can you see any problems with this? Or do I this time have to forget the easy calculation and go round counting sockets and appliances instead?

Any advice welcome!

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