This is the type of plug I’m referring to: [https://www.dhcsupplies.com/store/p/6483-9-x-16/3-Power-Supply-Cord-with-U-Ground-Plug.html](https://www.dhcsupplies.com/store/p/6483-9-x-16/3-Power-Supply-Cord-with-U-Ground-Plug.html)
In: Engineering
It’s an application of the original phrasing of Murphy’s Law: “If there are multiple ways of doing something and one will result in failure, people will do things the way that results in failure” which was a statement of design principles: if you have a symmetrical plug that blows out fuses when plugged in one way but not the other, you need an asymmetrical plug.
As someone else stated, it’s easier on the grid when electric motors draw current in the same direction, and plugs like that along with sockets like that ensure that this happens as uniformly as possible.
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