 Re: insulation resistance with a Fluke 1652
On the Fluke you will not get any better than >500 meg.
You are doing it right testing at 500volt (so long as not elv circuit) but if it was a new installation you will need to test between
line - neutral
line - cpc
neutral - cpc
after removing lamps / dimmers / neons / trannys etc
For PIR's it is acceptable to link neutral & line then test to cpc, lazy but acceptable |