Answer / brewed

There are many factors to consider when choosing cable
size .nd I will list just but a few.
1. You need to know the kind of load.
2. you need to know if its undergrond, overhead, in or out
doors
3. You need to know the temperature of your environment.
4. You need to consider the atmospheric pressure
With these and other facors you multiply them, depending on
your installation rules, to get a k factor which will then
depend on rated current carrying capacity of the cable at
hand.

Answer / s.arunkumar

1.Voltage level.
2.Type of cable going to used.
3.Whether the cable is going to laid in air,tray or in
burried.
4.Derating factor, Grouping Factor and ambient temperature.
5.Voltage drop as per the standards.

Answer / fida

I am using transformer turn ratio tester for 250KVA 13.8KV
primary and 220V secondary transformer what should be the
correct values of turn ratio test how i assume the correct
values for turn ratio.

Answer / leturtle

It is normal practice to have a rating for the earthing
system commensurate with the maximum system design fault
level. The normal maximum 400kV fault level is 63kA 1s.
Take the formula from EA TS 41-24 [6]

If you can't find it go to www.ees-group.co.uk on the FAQ
section.

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