Single and Three Phase Equipment?

Rosann Mccomb: read the motor name plate. sometimes you can tell by the operating voltage, i.e. 120 or 240 volts is usually single phase, 208, 277, 480 are usually 3 phase.... that's U.S. voltages, not sure about other countries

Charissa Riley: A single phase motor will have electrical connections for two conductors and ground. A 3-phase motor will have connections for three wires (delta wound) or four wires (Y wound) and ground.And, yes, read the nameplate.

Brittanie Zakutney: Single phase motors usually have a large cylindrical lump on the side for the starting capacitor.That and you can always try reading the lableplate.Also there is normally a wiring diagram on the inside of the terminal junction box cover.

Darren Heling: The best way is to read the nameplate - it will tell you.If you don't have a nameplate, then you may be able to tell something by looking at the number of electrical leads on the motor. A three phase motor will have three leads, w! hile a single-phase motor USUALLY has only two (but not always).However, if you can't read the nameplate, you also don't know the voltage and horsepower rating, and if you don't know those things, then I don't think you want to be experimenting with applying power - regardless of whether it is three-phase or single-phase,...Show more