A
andekoch
Just looking for general pointers here as to what can cause low (approx 0.3M - 0.4M) readings when doing insulation resistance tests between N and CPC.
Obviously the main earth needs to be removed as well as the main bonding or there are likely to be low (probably zero) results esp on TNCS systems.
Lets assume that there is not a real dead short for now, to state the obvious.
To clarify I am lookin for things like say when doing P - N and you get a 0.3M it is probably a pilot light or RCD fused spur. extractor fan is another low P - N reading cause etc
Obviously the main earth needs to be removed as well as the main bonding or there are likely to be low (probably zero) results esp on TNCS systems.
Lets assume that there is not a real dead short for now, to state the obvious.
To clarify I am lookin for things like say when doing P - N and you get a 0.3M it is probably a pilot light or RCD fused spur. extractor fan is another low P - N reading cause etc