Answer Posted / karthikeyan.s

For an earthed power system, phase to phase voltage is
equal to line voltage and phase to earth voltage shall be
VL/1.732. But for an unearthed power system, phase to earth
voltage shall be equal to line voltage (VL). Hence for an
unearthed system the cable insultation should be very high
to withstand the abnormal voltage during fault.
That is why it has been widely said that 6.6kV unearthed
cable shall be used in 11kV earthed application, since the
insulation level for an unearthed cable is very high
compared to earthed cable.

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