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M

mullock

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Help needed please everyone

This week on my course we have been instructed that when designing a circuit and specifically cable sizing that to work out the cable size you devide Ib (design current) by grouping/ temperature factors etc. However everything i read is telling me its In (pretective devise nominal rating) thats devide not Ib.

I have questioned this several times but continue to be told i'm wrong. i was told that it is done this way, when a circuit with a single devise is installed but not for say a multiple devise circuit say a ring circuit. i'm still not convinced.

Hope this makes sense.

please tell me i'm not the one going mad.
 
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