There are a lot of theories floating around about why there are holes in electrical plugs. Does it really matter? In short – not really, but lets find out anyway!
Theories out there that are false:
Holes are for “lock out” – not a bad idea… but not the intended use.
Holes were implemented to save metal during wartime? Nope.
- Standardized electrical plugs with holes were invented shortly after 1913.
- WWII was during 1939-1945
- Lockout tagging wasn’t a thing until the late 1950’s.
So what’s the answer?
The original design had indents in the plugs to allow them to stay tight in the outlet. Others worked around the patent by drilling holes that could be used for the same purpose. Most outlets today use a “squeeze to hold” type of connection, but some still make use of the holes if there are there. “If they are there”?!? – That’s right, they aren’t even mandatory. So why are they still a part of the modern plug design?
“If it ain’t broke, don’t fix it.”
It costs money to redesign the equipment to change this & since people are so used to seeing plugs with holes in them, why change it?
So now you know!
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