Electrician and Wireman Power Systems Earthing

When a pipe electrode is used for earthing, the length of pipe should be at least ________ while plate electrode is used, the length of the plate should be at least ___________.

1
2.5 m, 2.5 m
2
1.5 m, 2.5 m
3
2.5 m, 1.5 m
4
1.5 m, 1.5 m

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