My question is was this a fair judgement? I understand we have IR values in 3000 but do they apply to things like motors our would there possibly be different requirements in product standards.
Maybe I'm over thinking this but as always best to ask others and see other opinion
Basically take the used part out of the equation because I suppose it makes no difference if used or new, except you'd probably expect higher values for new. Would you connect a motor that IRs less than 1MOhm? Would this change if the motor was disconnected as is for a certain purpose and simple asked to be reconnected as is?
Or are you just applying that as a closest available guide to this situation
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Even if used at 2.5meg I would expect a total failure in the near future if used.
So yes a fair judgment call.
depending on the if it's a moisture ingress, you could get it dried out in a oven and see how it tests, if it's a burnt out problem then that's a rewind or replace.
Also remember that a IR test isn't 100% perfect, had a 100kw motor that IR tested perfect, hooked up to a softstarter and the starter tripped, unhooked the softstarter IR tested - ok, hooked up and ran again, tripped again, this time disconnected really quickly and got a poor test and watched the IR go up to a really good test.
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