I'm not an electrician, but I am currently having my house wiring
re-done by an electrician and this is my understanding:
If you want to run 220V and 110V outlets from the same breaker, you need
to use a sub-panel with separate breakers for the 110V circuits. Four
wires are needed from the main panel, two hots, neutral and ground. The
ground can be a smaller gauge so long as it goes only to circuits that
are protected by a circuit breaker suited for that gauge.
I did something similar to that when I wired my well, which is about 400
ft away from my house. I wanted a 110V outlet and light in the pump
house as well as 220V for the pump.
Alan N1AL
On 12/30/2014 09:35 AM, Jim Brown wrote:
On Tue,12/30/2014 12:01 AM, Edward R Cole wrote:
When wiring my shack for 240vac I bought No.8-4 conductor cable
(three-No. 8 and one solid copper No.12 wire in the cable. So the
60amp load box is properly connected to provide 120v break out as
well as 240vac with standard breakers. But my 240v outlets are only
good for 240v as a result.
That sounds fine, except that what you can connect to those 240V
outlets depends on how they are wired. If they are 3-circuit outlets
with phase, phase, and ground, you can, indeed, connect only a 240V
load. If they are 4-circuit outlets with phase, phase, neutral, and
ground, you can connect a load that draws both 240V between the phases
and 120V from one phase to neutral. Also, I'd be concerned about the
size of that ground conductor. In general, the ground conductor must
be sized at least equal to the phase conductors.
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