Earth pin in three pin plug
Explain why in the three pin plug earth pin is thicker and longer in comparison to the other pins?
Expert
It depends on R=rho l/a where area(a) is inversely proportional to resistance (R), thus if (a) increases, R decreases and if R becomes less, leakage current will take low resistance path hence, the earth pin should be thicker. It is longer because the First to form the connection and last to disconnect must be earth Pin. This ensures Safety for person who utilizes the electrical instrument.
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