Lou Decruss wrote:
>
> On Tue, 27 Sep 2011 19:15:14 +0000 (UTC),
> (Steve Pope) wrote:
>
> >sf > wrote:
> >
> >>On Tue, 27 Sep 2011 01:02:54 +0000 (UTC),
> >
> >>> Any U.S. house that does not have 220 wiring should be upgraded
> >
> >>Agreed.
> >
> >Let me correct that to "any house that does not have a 220V
> >service entrance should be upgraded". There's not actually any
> >need to put in any 220V circuits unless/until you have appliances
> >that need them. Putting in a 220V circuit randomly, without knowing
> >which appliance it needs to be hooked to, would be silly as it
> >would likely end up in the wrong place, at least slightly.
> >
> >As for Sheldon's point, yes, only a licensed electrician should
> >put in a service entrance. It's usually considered okay for
> >DIY types to put in a 120V circuit, lamp wiring, or similar.
> >An experienced DIY type might take on putting in a 220V circuit.
> >I never have done this.
>
> A 240 volt circuit just has an extra wire connected to the opposite
> phase. It's really not as big of a deal as you think.
Nope, nothing magic, more dangerous or more difficult about 240V
circuits, just another wire. The same goes for 3 phase 120/208 Wye
circuits not serving motor loads. "Wild leg" 240 delta circuits require
a bit more attention to detail ensuring that the "wild leg" is not
confused with the others, but even that is no big deal. Phase rotation
needs to be taken into account for three phase motor loads, but again
it's not brain surgery.