It is a test button to confirm the operation of the earth leakage…
“Duhuh (or something that sounds like that)” he says…I can see that…it is written on the unit…I ask what does it do. Does it push a lever inside and trip the unit mechanically or does it test it electrically as well…what does it do?”
Oh, I understand. Well, it connects a resistor between live and neutral causing an internal leakage current to simulate a fault condition.
Mmm, and for three phase is there 3 resistors?
No, only one phase and neutral gets tested.
He looks at me with his blue german eyes and I know what is coming.
But he only says…so they check it electrically and mechanically. That’s good.
Then I begin to wonder about the three phase one and if that is according to the standard…
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[wpedon id=2236]
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