Answer Posted / c.satheeshkumar

1.For earthed and un earthed XLPE cables, the IS 7098 part2
1985 does not give any difference in specification. The
insulation level for cable for unearthed system has to be
more. In simple statement the manufacturers states that 11
KV earthed cable is suitable for use in 6.6 KV unearthed
system.The process of manufacture of cable is same. The
size of cable will depend on current rating and voltage
level.

what IS specifies and I quote below:

" b) Voltage Grade (Uo/U)

1) Earthed System - 1.9/3.3 kV, 3.8/6.6 kV, 6.35/11 kV,
12.7/22 kV and 19/33 kV.

2) Unearthed System - 3.3/3.3 kV and 11/11 kV.

Note 1 - Cables of 6.35/11 kV grade (earthed system) are
suitable for use on 6.6/6.6 kV (unearthed system) also.

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