Domestic CUs have built in wiring of 16mm2 but...

E

Eddiesparks

...what if you had a 100a cutout?!

So for e.g your tails (consumer and dist.) are both 25mm2 and you have a cutout fuse that is 100a - technically the cutout fuse is the only thing protecting from itself to the bottom of your mcbs. Most consumer units have the "built in" cables that are 16mm2 (from bottom of main switch to top of RCDs) - The CCC of these cables is 85/87ish amps so isnt that a problem?!

I'm curious!

Thanks

Ed
 

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