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Sizing of RCBO

FusionControlEng

Hello All

I have been given the tasks of the sizing of an RCBO for 20 x 13A sockets, I am very new to electrical services design 

Obviously, the size of the RCBO will not be 260A  as this would assume all the sockets will be pulling 13A all at the same time which is very unlikely to happen

Is there a basic methodology for sizing an RCBO?

Many thanks

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    Thank you all for your input, I quite a bit to work with here and I should reach a solution

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    Thank you all for your input, I quite a bit to work with here and I should reach a solution

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