The minimum size of a copper strip to be used as an earth electrode must be:
Right Answer is:
(25 × 1.6) mm
Strip earthing: This type of earthing is used at places that have rocky earth beds. It is buried in horizontal trenches of a minimum depth of 0.5 m.
In this system of earthing, the strip electrode of the cross-sectional area is not less than 25 mm × 1.6 mm if copper and 25 mm × 4 mm if GI or steel.