Answer / z_hosen

When any 3-phase 4-wire system (Y/star) is not earthed
(neutral not earthed) then the system is not balanced and we
can't say what is the neutral current is? but when we
earthed neutral then it is a balanced and neutral current
almost zero.as a result voltage level is changed when the
unearthed cable is earthed.

Thanking u
z_hosen@yahoo.com

Answer / k.rajmohan

Due to Ferranti effect the un earthed cabe voltage will
shootup, when unearthed cable system cable earthed.

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