What is the purpose of power outlets with T-shaped holes?

t slot receptacle
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However, a 20 amp outlet has a small horizontal slot that extends from the side of one of the vertical slots This is because you don't want

Interesting I've wondered about those receptacles with dual T-slots before When exactly did it become standard for the parallel blades to be 120V

taiwan lottery 39 They are similar to the three-prong, 15-amp outlets but have a horizontal or T-shaped pin on the left This helps prevent people from plugging items into the

texas poker game outlet is to look at the prong style A 15A outlet has 2 vertical slots, while a 20A outlet has a third slot that resembles a sideways T X Research