how do you wire a 240 volt single phase motor?

Question

it is an air compressor in my garage-have 240 volt single phase 50 amp service only need 15 amp for the motor.there is only a black and a white wire going to the motor from the cut out switch.I have 2 110 volt feeds and a common-how do I hook them up to the switch?

Answer 1

caution;
most 240 volts motors are dual voltage and can be reconnected in the terminal box for 110 volts, be sure to read the nameplate rating of the motor before connecting anything, if the nameplate voltage is only 240 volts then it will be fine, whatever color the wires connected already to the switch, but the standard color of 240 volts single phase should be red and black (Canadian Electrical Code), haven't got hold of NEC but there shouldn't be a white cause it is the color of neutral, anyway if it is a single voltage motor (240 volts) then you will only connect your two wires, line to line and don't use the neutral or common, just the green for grounding, be sure too that your line to line voltage is 240 volts, but if it isn't, and you will connect a 110 volts unwillingly to the 240 volts motor, you can just observe that the motor wont run normally for half of its voltage rating, or it won't start at all but hums.

Answer 2

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RE:
how do you wire a 240 volt single phase motor?
it is an air compressor in my garage-have 240 volt single phase 50 amp service only need 15 amp for the motor.there is only a black and a white wire going to the motor from the cut out switch.I have 2 110 volt feeds and a common-how do I hook them up to the switch?

Answer 3

240 Volt Single Phase

Answer 4

green is protective ground. (grounded at breaker box)

white is neutral (grounded at breaker box)

black is hot line 1 (110 v) (connected to the hot line thru the circuit breaker in the breaker box)

on multi line power cables:

red is hot line 2

blue is hot line 3

normal 110 wiring uses white, black, and green wire colors (single phase)

normal 220 volt uses white, black, red, and green wire colors ( 2 phase

3 phase wiring uses white black red blue and green wire colors
there are some exceptions to this in that some 3 phase wired delta connection does not use the white wire, while white is used in 3 phase wired wye connections. 3 phase wiring is used almost exclusively in motors.


Are you sure your motor is wired for 220?

Answer 5

The voltage between the two 110 volt feeds should be 220 volts. To use it, you need to install a double circuit breaker so that the load side of the breaker has two connections, one from each 110 volt feed. If the breaker trips, both feeds are disconnected from the load simultaneously.

Answer 6

Buy a reversible motor. Single phase standard motors won't reverse unless it has jumpers specifically for that.

Answer 7

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By using a double pole double throw switch. (A switch that switches two wires at the same time), preferably with an off position in the middle. Connect switch wires to suit both run conditions.

Answer 8

The real question here is why are you willing to trust someone on Yahoo answers with a question such as this. No offense, but if you don't know how to do it, you won't know if someone gives you inaccurate instructions. Ask an electrician.