what is the difference between earthed and unearthed cable?
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Answer Posted / e.k rajan nair
In 3phase earthed system, phase to earth voltage is
1.732times less than phase to phase voltage. therefore
voltage stress on cable to armor is 1.732times less than
votage stress between conductor to conductor. whre as in
unearthed system, (if system neutral is not grounded)
pahse to ground voltage can be equal to phase to phase
voltage. in such case the insulation level of conductor to
armor should be equal to insulation level of conductor to
conductor. as a thump rul we can 6.6KV UE cable is equal to
11k earthed cable ie 6.6/6.6kv UN cable can be used for
6.6/11kv earthed system. because each core of cable have
the insulation level to withstand 6.6kv so between core to
core insulation level will be 6.6kv+6.6kv = 11kv
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