GN3: IR test, whole installation vs final circuit

[Silly Sausage]

Forgot about this!

Re: the CPCs being connected to Earth, No, but what you said is good.

I'm thinking of, if they weren't and there was a fault of the old negligible impedance ...

 

[Simonslimline]

Forgot about this!

Re: the CPCs being connected to Earth, No, but what you said is good.

I'm thinking of, if they weren't and there was a fault of the old negligible impedance ...

Not quite sure i follow you here!

If we are carrying out Insulation Resistance testing then the circuit or circuits (depending) will be safely isolated from the supply.

I may be missing something very obvious here though. Thanks:smile5:

 

[Silly Sausage]

Last clue.

0 Ohm L-E fault, cpc not Earthed, put 500V on it, what's the V on the cpc/exposed parts?
Other trades wandering around...