Is 208/230V Single Phase or Three Phase Power?

Question

I'm trying to find out if an air conditioning unit requires 1 phase or 3 phase power. All I know is that the voltage is 208/230V. Is there any way to tell from this if the power is single phase or three phase?

Answer 1

208/230V usually is 3 phase voltage.
The AC unit suppose to have something on it that tells you if it's a 3-phase or not.

Answer 2

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RE:
Is 208/230V Single Phase or Three Phase Power?
I'm trying to find out if an air conditioning unit requires 1 phase or 3 phase power. All I know is that the voltage is 208/230V. Is there any way to tell from this if the power is single phase or three phase?

Answer 3

A 3-phase unit usually has a 4-pronged plug, 3 wires for the 3 phase power, and 1 for ground. Many households have 208/230V single-phase power, so if the AC unit is meant for household use, it might be single-phase. If the plug only has 3 wires, one of which is the ground, it's single-phase. Look at the NEMA site to see if your plug is a 208/230V single-phase.

Many industrial AC units use 3-phase power because 3-phase motors are more reliable and efficient.

Answer 4

It could be either one.

In the US, even single phase AC units are designed to run on either 230V or 208V single phase.

The 208V single phase is provided when the utility serves a customer from a 3-phase 120/208 V transformation. Single phase customers get two legs of the service plus the neutral. Phase-to-neutral they get 120 V. Phase-to-phase is 208 V.
A special 5-jaw meter socket is often used.

Traditional residential customers get a 120/240 V single-phase, 3-wire service.
Here they would get 120/208 V single-phase, 3-wire service.

The ability to run at voltages down below 208V is why the central AC unit does not stall out during brown-outs (low voltage conditions). You'll generally have problems with other motor equipment long before you notice it on your AC unit.

The size of the AC unit could be a tip-off. If this is a large window unit, it is most likely single phase. If this is a residential AC unit then it is most likely single phase. The largest single phase AC units are rated at 5-tons of cooling capacity. (60,000 BTU/Hr)
1-ton=12,000 BTU/Hr.

Check the nameplate for some cooling capacity information or other electrical data such as amps.

Answer 5

230v 3 Phase

Answer 6

Best way to tell 3 phase is how many wires are used, 3 phase need 3 wires (4 wire if you inclue the ground)and 1 phase uses 2 wires (3 wire if you include the ground). Also where its being used is it an residential area (mostly 1 phase) in a comercial or industrial (it is 1 and 3 phase)

Answer 7

You need to know the number of wires. For commerical there is plenty of single pahse 208/230. Your AC probably has an electric dryer type of plug which is a three phase setup.

Answer 8

This is single phase.
With 3 phase you would get 660,440,and 380 volts.

Take the motor terminal cover off with three phase you get red ,yellow,and blues wires entering{three wires}.

Single phase you get two wires live and neutral.You may also be able to see a capacitor on the motor body if that is the type of start configuration.

Answer 9

well if its residential it is single phase. Check the number of wires. If you can't figure it out you probably shouldn't be messing with it anyway. The 208/230 V comes from the Wye-Delta transformation. Good luck, don't blow your guts out.

Answer 10

if you find this info that mean this device is available to work in 1 phase or 3 phase and you need to clearfy this with the supplierso you know what you need