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Question
Fig shows a three pin plug top. Label the three pins. Why is the top pin thicker and longer than the other two? Why are the pins splitted at the ends?
Solution
E is for earth pin, N is for neutral pin and L is for live pin.
The earth pin is long so that the earth connection is made first. This ensures the safety of the user because if the appliance is defective, the fuse will blow off. The earth pin is made thicker so that even by mistake it cannot be inserted into the hole for the live or neutral connection of the socket.
The pins are splitted at the ends to provide spring action so that they fit in the socket holes tightly.
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