Fair enough, I suppose that I was being a bit 'over-dramatic' in what I said (even though most whole-installation IRs of domestic installations I've personally seen have 'been off the top of the scale').
Maybe for you, but I suppose it's a personal thing.
Maybe, that's not really the sort of 'IR testing' we're talking about, is it? ... and, in any event, would a protective device not already have 'told you' if there was a short-circuit somewhere>
I wasn't intending to be sarcastic, honest!
There wouldn't necessarily be anything wrong with 10 Megohms. It is really going to depend on the numbers and lengths of circuits involved etc. As I said, it may also be as a result of plaster drying out etc.
In terms literally literally of the 'resistance of the insulation', no credible length or number of PVC-insulated conductors (particularly in a domestic dwelling) should have a 'low' IR, but ...
If you are talking about conduction through condensation/moisture, then that's a possibility - but I would still be worried if IR were as low as 10MΩ in the absence of any apparent reason to suspect that moisture might be the issue.
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