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Many part series explaining about electricity in hopes of helping you avoid some common mistakes I see in a lot of DIY Green Power projects.
Including ones that make it on TV.
I said "those lines" (plural).
While the bundle of wires in most houses equates to 240 V.
I was referring to each individual line/wire (120 + 120) so those line(s) indeed are 120 v each alternating current) That line (singular) is 240v.
I stated it this way because we actually have an additional wire.
Our house/office was once used to repair aircraft and the machinery required large powerful "Three Phase" motors.
So our service is 3 phase.