Answer / dev

that is earth wire

Answer / manish2march@gmail.com

some time it needs to protect the transmission line from
lightning .so 4 wire is preffered as ground wire....

Answer / n rajesh

One is Red
second is yellow
third is blue
fourth is green for earth.

Answer / sudhir singh

Fourth wire
needed in line
is of GI
provided for
earthing purpose
in case of any
fault occuring
in line we can
call it earth
conductor

Answer / ashok mishra

4th wire is GI earthed wire

Answer / b.janardhana rao

4th wire we can use earth wire at the same time it can protects from lightning.

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