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Postby m3wilson » Sat Nov 28, 2009 7:32 am

I have a garage consumer unit with a 63A RCD incomer protecting 1 x 32A MCB, 1 x 16A MCB and 1x 6A MCB.

This is all fed from an MCB in the main House, what rating should the MCB in the main house be?

Thanks in advance.
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Postby ericmark » Sat Nov 28, 2009 12:48 pm

All to do with size of cable and how the cable is run. I have seen many times where the sizes of MCB on a consumer unit are same or even bigger than the MCB supplying it where someone has bought one really populated.

This is very common with caravans where total supply is 16A but consumer unit in caravan has 16A MCB for sockets.

So what size cable in mm² and what type of cable SWA or Twin&Earth etc. And how is it run? Underground or through wall with insulation in wall.

This is not really a question for an on line forum especially one which has no pictures it really needs someone to physical inspect to answer this.
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Postby marconii » Sun Nov 29, 2009 6:11 pm

ive also seen outside electrcal supplies ran from a fused spur...you need to step the distance out and then calculate the size of the cable...ie...6mm/8mm etc... from the board....
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