Answer / k.p.sharma

It may be maximum 5V and minimum 0V.

Answer / shri..

Minimum it should be zero

Answer / chandramohan.a

0 to 3 volt only

Answer / prashant mohokar

Typically 0 to 5 VAC, but only if you are using supply from
the same source whose star point is earthed.

If a isolation transformer or online UPS is being used,
then the voltage would be 50% of supply voltage (e.g. if
your supply is 110VAC then voltage benween phase & earth
and neutral & earth would be 55VAC).

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