Answer / n s rathoe

It should be less than 5 volt.If it is not connecting
properly you have faced problem with electronic cards
(specialy low voltage suppy zones criteria)

Answer / prajeesh

I think it is limited to 2 volts. If it increases, that will cause break down of electronic cards...

Answer / ksmanyam2

I thought it should be less than 0.5V.

Answer / k.prakashchandra

Zero,If there is any voltage ,it is of a phase.It will
result in unequal voltages and neutral shifting

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