Question

The diagram in the figure shows
a three pin plug. Label the three
pins. Why is the top pin thicker
and longer than the other two?

Answer 1

The earth pin is made 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.
The earth pin is thicker so that even by
mistake it cannot be inserted into the hole
for the live or neutral connection of the
socket.