insulation resistance of a 3ph circuit in 2391

[Scotchydog]

On single phase installations, the main switch will be double pole.
As such there is no requirement to disconnect the N-E link.

Do you reckon it will be the same with 3 phase board if not whats the best way to go

 

[Scotchydog]

Cant i just remove the main earth if i get a reading between N-E

 

[Deleted member 26818]

Do you reckon it will be the same with 3 phase board if not whats the best way to go

Many 3phase installations have main switches that just isolate the phases.
If you don't disconnect the neutral, you will be testing it back to the supply.

 

[Scotchydog]

Many 3phase installations have main switches that just isolate the phases.
If you don't disconnect the neutral, you will be testing it back to the supply.

The neutral on that circuit or like the main neutral to the bar?

 

[Deleted member 26818]

The neutral on that circuit or like the main neutral to the bar?

It depends on how you are testing.
If you are disconnecting the conductors at the CU to test an individual circuit, then it would not matter.
However if you were to conduct a global IR test, you would have to verify that the neutral is disconnected, or you would be testing the IR of the network supply neutral.