Answer / 7anoter4

Usually a vertical grounding electrode –made of copper,
copperweld steel, stainless steel or else-and length of 3-20 m
is driven in earth and the upper end will be exposed in a pit
covered by a lid- about 0.3-0.6 m deep and 0.3 m diameter.
This pit facilitates electrode connection with horizontal
grounding conductor and as a check point of electrode state-
grounding [earthing] resistance measurements and other.

Answer / er. s.manimaran b.e(eee)

it is longest copper bar which is burried into earth .and
its connected to main earth wire of utility.

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