On Wednesday, 22 July 2020 22:15:16 UTC+1, wrote:
tabbypurr formulated on Wednesday :
Tripping at switchoff happens if the element (or other leaky bit) has its
neutral switched off before its live. Element is most likely - test its
insulation.

That may need a meggar to be certain to find the point of leakage.

A lot of such faults can be picked up with just a multimeter on resistance range. If not the mains itself can provide the HV - only suitable for folks that can do that safely of course. A megger is quicker/easier, but not actually needed.


NT