Which phase is my electrik socket on?

[Rich.]

An air conditioner, dryer or range with a combination of 120 & 240
volt loads. I can't remember exactly the last time I saw what you are
talking about. Probably sometime in the '60s.

Like I said, be specific. This is a world wide group with people
using different electrical systems and having different levels of
training.

An A/C, dryer, or any other 240 volt device/appliance would use a single
2-pole breaker, it would not use breakerS. For Christ's sake be man enough
to say you mis-read what was written, or your brain wasn't operating at 100%
that day, and knock of this trying to justify what you wrote crap. For the
record, 3-wire homeruns to a panel to feed two circuits are very much used
still today and are not indicative of 1960s wiring.

 

[bud--]

For the record, 3-wire homeruns to a panel to feed two
circuits are very much used still today and are not indicative of 1960s
wiring.

I like them and they certainly have been common in the past. For example
I can think of a hospital where substantially all the 120V circuits to
patient rooms started as 4-wire 3-phase multiwire branch circuits. Other
circuits were also mostly multiwire. But the 2008 NEC requires a
"simultaneously disconnect" for multiwire branch circuits. That does not
have to be a multipole breaker - it can be single breakers with a
(listed) handle tie. It would make multiwires in the hospital impractical.

AFCIs have probably eliminated most multiwire branch circuits in houses
since you can't have a common neutral unless the AFCI is 2-pole. You may
be able to get a 2-pole AFCI, but they probably cost far more.