J
John Matrix
What you do is rewire the circuit or design it better. Or use a B type MCB but only if the circuit is adequate for a B type MCB. If it’s a Condition report surely it’s a C2 if a circuit fails max Permissible Zs. I fail to see your point anyway because a circuit can still fail doing a Zs test. We shouldn’t be relying on parallel paths to get circuits to pass. Even thow it is done, doesn’t make it right.Problem here, is that we work to BS7671, not to the NICEIC regulations.
There are no tables of maximum R1+R2 in BS7671, there are only tables for maximum Zs.
So it’s all very well measuring R1+R2 and adding it to Ze, but what do you do if that value is above the maximum permissible?