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wouldnt 4mm cable affect the tripping times of the mcb though?

ah right, so i am just getting confused because the the maxium a 2.5mm cable can take is 21amps so i thought you could get away with a smaller breaker, so i take it would be wrong to wire a ringmain in 4mm cable and put it on a 32amp breaker is that right?

ah right then ye, and why does is it also allow you to use 4mm and 2.5mm for when you wire a radial what the difference why can they just use 2.5mm? And so basically they are just splitting the load over so the cable will be able to carry 21 x 2 =42 amps, so that why you can use a 32 amps...

Hello, I am wondering as to why a ring main is wired in 2.5 mm flat twin when in the regs book it can only take 21amps?? and it is protected 32amp? how does that work why is 2.5mm cable used for it and a 32amp breaker? how do they work that out? and also i am just wondering in the regs book...