Grouping factors - Circuit design

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Joined
Apr 24, 2023
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Hi Guys,

I have a question about derating for grouping factors.

I understand how to use Cg (etc..) and why.
But what would be the maximum run of grouped cables to not have a derating factor applied?
eg. cables leaving the rear of a CU could be grouped for a very short run, possibly only ~50mm.
would Cg still be applied for the ~50mm due to that still being a 'hot spot'? or is there a minimum before we apply it?

Thanks
 
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