Why in a three pin plug the earth pin is thicker and longer than the other pins?

Why in a three pin plug the earth pin is thicker and longer than the other pins?
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1 Answer

Answer :

A:It depends upon R= ρl/a where area(a) is inversely proportional to resistance (R), so if AREA increases, RESISTANCE decreases & if RESISTANCE is less the leakage current will take low resistance path so the earth pin should be thicker. It is longer because it is the first to make the connection and last to disconnnect. This assures Safety for the person who uses the electrical instrument.
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Last Answer : It depends upon R=ρL/A where area (A) is inversely proportional to resistance (R), so if area (A) increases, R decreases & if R is less the leakage current will take low resistance ... last to disconnect should be earth Pin. This assures Safety for the person who uses the electrical instrument.

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