12-2, right? Not 12-3?
Excuse me if I'm telling you things you already know, but there is occasional
confusion on this part. For premises wiring such as NM cable (Romex), the
number after the dash indicates the number of current-carrying conductors, and
does *not* include the ground. Thus, 12-2 Romex has three wires in it, and
12-3 has four.
xx-3 cable is used for electric dryers, cooktops, ovens, etc. because those
appliances also have 120V circuits (timers, motors, etc.) which need a
Pure 240V loads, such as a table saw or electric baseboard heater, use only
the two hot conductors and thus need only xx-2 cable. With ground, of course.
Doug Miller (alphageek at milmac dot com)
On Mon, 15 Oct 2007 17:36:04 GMT, email@example.com (Doug Miller)
In addition to that labeling confusing a lot of people, back in about
1960 when I worked in a hardware store, if you wanted a ground with
your NMC you had to state "with ground." If you asked for 12-2, you
got a two conductor wire, no ground. If you wanted a ground wire, you
had to ask for 12-2 w/ground. That's no longer the case--now you get a
ground with your NMC whether you want it or not (and why wouldn't
In those days, two wires went to your electric water heater or your
pool pump--both hot. I know--I grew up in a house in FL which we built
in 1956. We had a pool installed in 1960 (which, watching the
electrician, who was the dad of a classmate, was the beginning of my
education on electricity). There was no ground required.
Obviously, that, too, is no longer the case.
This question is OT to the original post:
Based on the OP's motor's description, what information on the tag for the
Baldor motor is missing that would make one suspect the motor is really a 3
ph, 3hp motor?
For example, I find a 3hp motor at a flea market, and the seller claimed it
was from a table saw, what clue would I look for to tell me it is 3 phase?
(and thus should put it down, since I ain't going to get 3 phase in my
house, no way, no how.)
Wouldn't a 3 phase also be listed as input voltage 203 to 230 VAC
Well, if it has the manufacturer's tag on it, number of phase will be
marked. And if it doesn't have the tag, I'm not buying any motor for
anything other than junk, basically, unless there's a way to test the
operation at what is being claimed is the operating voltage/phase...
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