185mm supply

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I'm working on a job, where the 3phase supply is 185mm cables going to the main switch. However, the supply coming in via the main fuses looks much smaller. Which cable size do we take into account, the unknown incomer size, or the 185mm into the main switch?

Cheers
 
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Is it that big for volt drop or a different installation method?
 
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The 185's are your responsibility - And sized according to your load and volt drop. The supply to the incomer is of no concern to you at all - Ignore it ;)
 
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I was told not to worry about it, but thought i'd better ask the question, cheers
 
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