管理员发布:
US single phase line-to-line mains voltage is interchangeably referred to as 220V, 230V, and 240V. This is because it started off as 220V, but was raised incrementally over time to deal with increasing demands on the grid; right now, it''s said to be 240V at the service entrance, but 230V at loads to account for voltage drops in building wiring.
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