Discussion
The diameter of a copper rod in rod earthing should be at least ______.
Answer: C
In rod earthing the earth electrode is a rod driven into the ground, and a copper rod needs a minimum diameter so that it is strong enough to be driven and carries the fault current without corroding away. The key gives the minimum diameter as 12.5 mm, option (C). The larger sizes of 18.3 mm and 22 mm would be allowed but are not the minimum, and 5.6 mm is too thin to be driven into the ground and would soon corrode.
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