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Am I being Stupid ?


RussellR

Question

I picked up a Domestic Disboard today and it is arranged with two RCD's One is rated at 80A but the other is only rated at 63A, it will be fitted on an instulation that is backed by an 80A service fuse.

To my mind I need to change the 63A RCD for an 80A one as in this configuration it is not protected from overcurrent ?

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5 answers to this question

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Evans Electric

All it means is the RCD is rated at 80 and 63 amps and will happily switch those currents same as the main switch in your board ,which I guess will be rated at 100 amps.

There is no overload protection in an RCD , remember.

Deke

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Thanks Deke

but is the 63A not the total current it can safely carry, appreciate it doesn't provide over current protection, but like a cable shouldn't it be able to carry the potential current ?

Or am I looking at this wrong ?

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What will it be feeding? If it's say a 32A ring, a 16A immersion and a 6A lighting circuit, no worries. If the total MCB ratng exceeds 63A think about diversity. Personally if you only have an 80A incomer, I doubt if you've got a problem.

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Evans Electric

A lot of the split load C/U,s had a 63amp RCD as they are only feeding half the board. Its unlikely that the second half of your board will be carrying more than 63 Amps .

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