Answer / aamod tripathi

The body earthing conductor sizing is done in india and
internationally by IEEE 80 :2000 standard and IS code 3043

These instruct the different formulae which are to be used
for calculation purpose generally it requires
1. fault current
2. time duration of the fault
3. a factor which is denoted by K and is dependent on the
material used for earthing.Table (1.D)(This takes into
account the ambient and operating temperature of the
material)

In case of a power house where many Transformers and the
switch gears are installed there we have to install
acompletee earthing grid which is like a square or
rectangular net of rods. the number of rods and ground rods.

The most important point in both the powerhouse earthing or
any other kind of earthing we have to keep in mind that the
earthing arrangement should have the resistance less than 1
ohm........ it is an essential conditon that must be
fulfilled.....

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