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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 ?
A live neutral loop test is the precursor to obtaining the prospective short circuit current test result. On a Megger LT320 loop tester you do the live neutral loop test then when the result is displayed you press the PSSC button for it to calculate and display the PSSC.
So if you obtain the PSSC using such a tester based on a live neutral loop test can you compare the test result with the amperage that is given in BS7671 that is required to operate the circuit protective device within the required time?
A live neutral loop test is the precursor to obtaining the prospective short circuit current test result. On a Megger LT320 loop tester you do the live neutral loop test then when the result is displayed you press the PSSC button for it to calculate and display the PSSC.
So if you obtain the PSSC using such a tester based on a live neutral loop test can you compare the test result with the amperage that is given in BS7671 that is required to operate the circuit protective device within the required time?
