DIY Doctor

Is 6amp feeding 100amp main ok?

Postby Debutant » Wed Nov 11, 2020 8:23 am

If I have a mcb in a consumer unit rated at 6amps which feeds a small enclosure with a 100a main switch am I right in thinking the main switch rating doesn’t matter as it’s protected by the first mcb in the circuit? Cable size is 1mm
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Postby Mr White » Wed Nov 11, 2020 6:30 pm

So long as anything after the protective device is rated higher that said protective device all is good.

So in your case you have a 6A MCB and 1mm cable, and a100A switch all is well.
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Postby Debutant » Wed Nov 11, 2020 6:57 pm

Thank you

I’m pretty sure that as long as the upfront/ first device is adequately sized to protect the cable within the installation any other devices or switch rating do not matter.
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