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> So in practice, 120 VAC or 48 VDC are the limits for household wiring

About 20% of the world uses 110-120 V and 60Hz. The rest uses mostly 240V at 50Hz.

Although 110V is safer, the US seems to ignore many of the safety features I see used elsewhere in the world.

How that translates to deaths per million people per year comparing to similarly rich countries, I don't know.




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