wrote in message
...

Don't be so quick to jump to conclusions. The NEMA 6-XX series gets used
for
both the 208 volt 120 degree and the 240 volt 180 degree 2-wire
connections.
Some devices work on one and not the other. You CAN derive three phase
from
one and not the other. A motor could be wired to use that angular
difference
(with the neutral) to achieve a motor starting direction instead of having
a
capacitor to change the angle on a shaded pole.

Also, if the supply is 208 volts then the maximum power available is 4157
watts
(3326 under the 80% rule), whereas with 240 volts it is 4800 (3840 under
80%).

240 volts is a 15.47% increase over 208 volts. 277 volts is a 15.47%
increase
over 240 volts. Can either of those be substituted for 240 volts easily?

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In this specific application the third prong is used only as a chassis
ground connection as everything including the light bulb is 230V. Also I am
no expert here but I think intermittent loads can exceed the 80% rule hence
the 14 gauge cord which would normally only be good for 15 amps but is
protected by a 20 amp fuse inside the oven and a 20 amp double pole circuit
breaker in the service panel. The NM-B (Romex) I used is 12-3 with ground
and has the white neutral conductor simply capped but not connected at
either end.