[Elecraft] 240V Line

[Alan]

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.