On Thursday, 4 January 2018 21:01:21 UTC, newshound wrote:
Got a heating element in a wallpaper stripper which is blowing 30mA RCD.

Testing live to earth on an old (but "electronic" rather than wind-up)
Megger (which seems to provide 320 volts DC) gives ~ 5 MegOhm.

Testing on a DVM gives ~ 200 kOhm, corresponding to a little over 1 mA
leakage current on mains.

So why the trip, especially given the Megger reading? Or is the megger
f**ed?

Whatever, I guess I need a new megger, any views on the £30 Chinese
models from eBay, or should I be looking at a second hand Avo / Robin /
Fluke etc? This is not for "professional" use, it probably only comes
out a couple of times a year.

A microwave turntable motor can do that. Crank it at suitable speed to put out upto 1kV, use 2 meters to measure V & i. The downside is output voltage is unsteady, affecting accuracy.


NT