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I'm starting to wonder that too - but I'm learning (I think) :) I'm actually struggling to understand what a friend told me. He said that the reason for installing an FCU and not just tapping off the ring main directly is to prevent the full 30amp load going through the light. If I've...

Thanks Plugwash! Just for my own interest, how does the fcu prevent the full 30 amp load on the ring main from travelling across the light I'm installing? Without blowing the fuse in the fcu?

I am installing a wall light and it will be much easier to connect it to the ring main than to try and connect it to the lighting circuit. I know I have to use 2.5mm ring main cable on the supply side of the FCU but can I use 6amp lighting cable on the load side?