Loft electrics - new socket or extension on fused spur

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but they would provide that same degree of protection whether the upstream OPD protecting the circuit as a whole was 32A, 40A, 50A or whatever, wouldn't they?
They would. But there would come a point when the upstream device no longer provided fault protection. ICBA to do the sums, but I'd be surprised if a 40A was unacceptable for 2.5mm²
Indeed. If you recall, we had an extensive discussion about this a little while ago.

Kind Regards, John
 

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