> Not only that, it is illegal and a shock hazard to use the
> ground wire as a neutral. You would need a four wire outlet
> or otherwise somehow ensure the power return neutral was
> isolated from the chassis.
So then why do amps that offer 120/240 VAC options do it that way?
The NEC manual for Resedential Wiring requires both a neutral and a ground
at the panel as well as in the distribution wiring. For a 240V outlet the
ground is terminated along with the ground at the outlet box.
For 240V circuits that power equipment using 120 and 240V items the NEC
manual CLEARLY states and shows both the neutral and ground wires going to
the same plug connection in a 3 wire outlet. It further shows the 120V leg
split off the 240V in a typical dryer circuit using the neutral/ground. This
one leg controls the motor and lights which would draw more current than a
1500W ham amplifiers 120V components.
Further, balance is not required on the 120V legs unless the current load is
a substantial part of the total. NEC gets into this a bit with a 70%
When I completely wired my current home I followed the NEC code and had no
problem with any level of inspection including many 240V outlets in the
shop, shack, and garage.
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