This is what I have always assumed but I have never actually checked. Good question.I've been told that there are small bumps on the inside of the outlet on the wall. When you plug in the connector, the bumps move into these small holes to help keep it in place. It's not designed to hold really securely, as you can still easily pull it out, just enough to keep it from falling out. I don't know if this is right or not, but it sounded logical when someone explained it to me.
There are some lock-out/tag-out products that use the holes as an anchor. I also tag cables that are unsafe with UNSAFE tags and zip ties through these holes.
I've been told that there are small bumps on the inside of the outlet on the wall. When you plug in the connector, the bumps move into these small holes to help keep it in place. It's not designed to hold really securely, as you can still easily pull it out, just enough to keep it from falling out. I don't know if this is right or not, but it sounded logical when someone explained it to me.
You mean they aren't where you tie your stuff on when using an extension lead as a hauling rope?
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