Discuss insulation resistance of a 3ph circuit in 2391 in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Good answer, but what is the FCU?
The 2391 board will be TN-S, if you had a TN-C-S supply you woulld have to remove the neutral test link otherwise you would get continuity between neutral and earth.
You need to break the neutral link on any TN system - TN-S included - for the purposes of an insulation resistance test.
The 2391 board had a seperate 'main isolator' which was probably 4-pole.
When the assessor opened this, it will have disconnected the neutral as well
On single phase installations, the main switch will be double pole.im doing am2 on tncs do i have to remove the main neutral out of bar or take each one out and on my lighting circuit do i only flick the switches on whichever phase its on thanks
On single phase installations, the main switch will be double pole.
As such there is no requirement to disconnect the N-E link.
Many 3phase installations have main switches that just isolate the phases.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.
It depends on how you are testing.The neutral on that circuit or like the main neutral to the bar?
Reply to insulation resistance of a 3ph circuit in 2391 in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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