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Trev..tell me bud, how do you get a Zs value from a dead circuit exactly? Read my posts before commenting
The job is not a freebie the boss pays for it.
I have calibrated testers.
Telectrix..spot on for getting it
Zs from a dead circuit is easy, you just use the alternative Zs testing method.
With the breaker open connect L to E at the far end of the circuit, test between the live and dead side of the breaker.
Simples!
As to how this could help you identify the fault, I am not entirely sure at the moment.
As far as your original post and the fault goes I would suggest that you did ask a bit of a daft question, you said the fault moved to with the circuit when you connected it to another RCBO so logically the fault must be on the circuit and not within the RCBO.
To properly test the RCBO you test it the same way you would a seperate RCD unit using the RCD test function of an MFT or a seperate RCD tester.
For general fault finding I would strongly recommend an analogue insulation resistance tester, it is much easier to work with a needle than a digital display. It doesn't have to be expensive or even calibrated if all you are looking for is the yes/no/maybe rather than measured values.
(And just in case anyone is wondering, yes I have been reunited with my happy pills this evening)
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