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Rotary isolator sizing

Baldyhugh

Hi

is it acceptable to use a rotary isolator which is a larger rating than required eg. Using a 32a isolator for a 16a or 20a circuit? Dependant on manufacturer, the higher rated ones are physically larger and offer more space inside for wiring. With my wholesaler there is only a couple of pounds difference in price, so it seems sensible to use the larger one but was curious if there was a regulation reason why I shouldn’t.

 

thanks

 

Peter

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    Certainly acceptable to my mind. In the old days we'd use 20A round joint boxes on 5A lighting circuits - no one bothered with the 5A ones as they were far too small and fiddly to get more than a couple of cables into.

    Likewise, isolators don't come in all the same ratings as MCBs, so often you'd have no choice but to use a higher rated one.

       - Andy.

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  • 0

    Certainly acceptable to my mind. In the old days we'd use 20A round joint boxes on 5A lighting circuits - no one bothered with the 5A ones as they were far too small and fiddly to get more than a couple of cables into.

    Likewise, isolators don't come in all the same ratings as MCBs, so often you'd have no choice but to use a higher rated one.

       - Andy.

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