[PaulHoule]

My guess is that Brazil’s infrastructure is not that different from other countries, since they run a 60Hz grid I’d imagine they use the system introduced by Edison’s company General Electric.

[NikkiA]

That's actually a fairly recent (1970s) change, prior to that it was a mix of 50 and 60Hz, 110V and 220V, with no national standard.

Also, rural household wiring is often dogshit all around the world with many places having bad earthing.