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2 commentarios

I will have to disagree.

Inside the socket there's a catch or "hook" to keep the plug from being pulled out easily. It is spring loaded The hook act to latch the prongs in the socket. When the lhook is in the holes, the flat surfaces of the female part of the socket will mate perfectly with the flat surfaces of the prongs.

If there are no holes, the surface contact betweek the prong and the socket will be only "hook" (point contact only) and also the spring action will become weaker and plug will be loose. Therefore, safety is compromised.

The holes in the prongs of a US plug have nothing to do with safety.
They are for easier manufacturing. Nothing else.