On 22/07/2020 22:15, Harry Bloomfield wrote:
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.
I've found that a few kohms is enough to trip. Not megohms.
30mA at 240v implies 80k ohms. So as long as you cann detcet less than
that, you are OK
In my case a motors showed around 3kohm with some sort of internal
winding to armature short
--
It is hard to imagine a more stupid decision or more dangerous way of
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who pay no price for being wrong.
Thomas Sowell