>4-wire 240v circuits.
A 4-wire 240V circuit requires a 4-contact appliance connector of
some sort, not a conventional 3-contact 240V outlet, because the
conventional 240V outlet bonds the third pin (the round pin) to the
backbox, which grounds it (if the backbox is grounded, which it is
required to be).
In the 4-conductor connector, two contacts are the "hots" (that is,
each is 120 either side of neutral), one is neutral, and the fourth
must be a green equipment ground wire that bonds the equipment
enclosure and backbox. That is the only way to legally (and safely)
use a 4-wire 240/120 volt circuit.
73,
Jim K9YC
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