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dglcomp · 11th Jul 2021, 5:53 pm

The issue could be that (assuming said drill is earthed) AFAIK 1.2Mohm is allowed for Class I appliances (earthed) but not fir Class II (unearthed) metal cased appliances, it certainly was that the limits on our older Fluke 6200 were 1Mohm for Class I and 2Mohm for class II appliances.
Naturally as some of the cheaper PAT machines only give a pass/fail (like the Seward Prime Test 50) they have to be set to pass only at the higher 2Mohm limit and as such will fail some devices that would otherwise pass.

11th Jul 2021, 5:53 pm	#4
dglcomp Heptode Join Date: Jul 2016 Location: Portland, Dorset, UK. Posts: 874	Re: Black & Decker PI utility drill The issue could be that (assuming said drill is earthed) AFAIK 1.2Mohm is allowed for Class I appliances (earthed) but not fir Class II (unearthed) metal cased appliances, it certainly was that the limits on our older Fluke 6200 were 1Mohm for Class I and 2Mohm for class II appliances. Naturally as some of the cheaper PAT machines only give a pass/fail (like the Seward Prime Test 50) they have to be set to pass only at the higher 2Mohm limit and as such will fail some devices that would otherwise pass.