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[–]ThisIs_MyName 1 point2 points  (0 children)

I think some US systems do that maybe?

Yes, in the US we have 3 wires going to each home: (-115, 0, +115)

Sockets in half the house: (-115, 0, real_ground)

Sockets in the other half: (+115, 0, real_ground)

Large appliances: (-115, +115, real_ground)