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Needing to meet mcb zs with ln loop.
Former Community Member
Where an rcd is relied on for fault protection due to high zs it has been suggested to me that the loop between live Conductors needs to be less than the mcb max zs. I can't find anything on this anywhere but he said he had this confirmed by an niceic assessor. Have I got it wrong ?
Normally it is assume a MCB will operate when there is a short, because Zs ha been tested and the MCB will disconnect a earth fault with a CPC that is the same size or smaller than the neutral .
With a TT installation there is nothing to base that assumption on.
Normally it is assume a MCB will operate when there is a short, because Zs ha been tested and the MCB will disconnect a earth fault with a CPC that is the same size or smaller than the neutral .
With a TT installation there is nothing to base that assumption on.
