You almost certainly don't have three phase service unless you live in some space that used to be industrial.
I don't think that reset button will protect you from chronic undervoltage. How big a motor is this? If it's just a horse or two, then your solution is really simple - buy a cheap buck/boost transformer, hook it up, and have a nice cup of coffee!
Grant Erwin
-n. wrote:
On Sat, 13 Dec 2003 00:49:19 GMT, -n. put forth the notion that...
If you have a 120/208 volt single phase service, it's derived from two legs and a neutral from a three phase service somewhere along the line. If your motor has a thermal overload switch, it should shut off if it's working properly, however this isn't going to solve your problem.
Jim,
I honestly don't know the answer to that question, and I don't have my work resources available to me right now.
You may find an answer here:
What about a large apartment building? Those are probably fed three phase, since all totaled, there is a *lot* of load, and this will distribute it fairly evenly.
Anyway -- if you are measuring 120V from neutral to both hots, but 209 between them, you *are* getting two phases of a 208V three phase feed.
Agreed -- that is the safest thing to do.
Good Luck, DoN.
On 13 Dec 2003 01:09:00 -0500, DoN. Nichols put forth the notion that...
Most likely they're feeding the building with three phase, but splitting it up to the individual apartments with approximately 1/3 of the units on AB, BC, and CA. That's pretty unusual in residential buildings. Too bad he can't pull the third leg up to his unit, but he's most likely on a single phase meter unless there's just one meter for everybody.
On Sat, 13 Dec 2003 1:22:28 -0400, Checkmate wrote (in message ):
Yes, it is an apatment building...thanks, I now understand why (2 legs of a)
3-phase service registers 208VAC. The motor is 5hp nominal,an Emerson motor, rated @ 22FLA. What spec Buck-boost transformer should I be shopping for? Any good online sources for the above? Thanks again guys for the electricity lesson.
^^^^^^^
I assume you meant to say "usual" there?
I used to live in a 55 unit apartment building, and the wiring was done exactly that way. Each apartment had a washer/dryer, with a "220" outlet for the dryer. The dryer motor ran on 110 and the "220" was just for the electric heating element, so I imagine all that happened is it didn't get as hot as it should have.
I got this hilarious mental image of a home shop type with a Bridgeport in his bedroom and extension cords running to the apartments on either side of him to get the other two phases...
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