The minimum length of pipe electrode used for earthing should not be less than

The minimum length of pipe electrode used for earthing should not be less than

Right Answer is:

2m

SOLUTION

The pipe used as an earth electrode is galvanized and perforated. Its diameter is 38.1 mm and its length is 2 m. The length may be increased to 2.75 m in the case of dry soil.

Another pipe of 19.05 mm diameter and of length 2.45 m is connected at the top of the above-mentioned pipe.

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