Why Do Electrical Plugs Have Holes

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This has been something which I have wondered about for a long time so I decided to start digging in and see what I found. After looking through NEMA standards, Underwriters Lab (UL) testing, Wiki articles, and discussion boards I have found 2 reasons why these holes exist. Additionally, I will debunk some of the other reasons I have seen online which I don’t believe are valid.

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