Are Holes in Plugs Totally Useless? Not Anymore!

A video on YouTube. In DIY & Home Repair, a Krater category.

Summary by Krater

This video explains the historical origin of the holes in US power plug blades and reviews modern locking extension cords as a solution to accidental plug disconnection.

From the video

Answers: Why do US power plug blades have holes in them?

US power plug blade holes
Harvey Hubbell invention history
Locking extension cords
NEMA standards for plugs
Edison screw base E26

What it concludes

For the last 75 years, the holes in US plug blades have not served a purpose until modern locking extension cords.
Holes in plug blades were originally designed by Harvey Hubbell to act as detents for greppers in lamp sockets.
Locking extension cords utilize the blade holes to provide secure connections rated to withstand up to 80 pounds of force.
NEMA standards state that plug blade holes are optional, but if present must follow strict placement guidelines.

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