Why do AC plugs have holes in the prongs?

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I live in USA, and it is very common for AC plugs to have holes in the prongs. Does anyone know why? Is this common in other countries as well?

2007-04-09 11:38:44 · 2 answers · asked by Roy E 4 in Science & Mathematics ➔ Engineering

Some recepticles have dimples in the metal socket that line up with the holes. It helps hold the plug in place -- a more secure fit.

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2007-04-09 11:42:37 · answer #1 · answered by tlbs101 7 · 2⤊ 0⤋

My mother used to put small locks in the hole to prevent us from watching TV... I don't think that's what they were designed for though.

2007-04-10 03:31:21 · answer #2 · answered by Daniel 3 · 0⤊ 0⤋