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TaigaUse a voltage regulator and plug it in 120 volt socket of the voltage regulator.
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The above answer is not good advice because a 120 volt air conditioner takes a lot of current. (Amps) Normal-sized SMALL domestic voltage regulators or step-down Transformers are not intended to provide power to such large appliances.
Before you try to use a voltage regulator or step-down transformer to power any appliance from a higher voltage service it is very important that you check:
- the rating-plate on the appliance to find out what current it draws at its rated voltage;
- the rating plate of any voltage regulator or transformer you are thinking of using to power it, to be sure it can handle the power (voltage times current) of the appliance.
For more information see the answers to the Related Questions shown below.
What is the voltage rating of a motor on a 3 phase 4 wire 277V lighting circuit?
If the motor is a three phase the most likely voltage the motor operates on will be 480 volts.
How star delta helping motor from overheat?
star delta motors start as a Y for 3 phase so the windings that normally see 480 volts see 277V a relay switches to delta then it runs as a normal delta motor the reduces the starting current by about 60% for 3 phase
What should be the primisable voltage between neutral and earth in a three phase system?
It is the line to line voltage divided by 1.73. 600V / 1.73 = 347V 480V / 1.73 = 277V 380V / 1.73 = 220V 208V / 1.73 = 120V
How do you get 277 volts from a 480 volt line?
All three phase four wire systems have the ability to produce a voltage to ground or neutral. Take any phase voltage be it primary or secondary and divide it by the sq. root of 3 which equals (1.73) and you will obtain the phase to ground or neutral voltage. The ground and neutral should be of the same potential and when talking about electrical installations these two words get interchanged quite often. Some three phase secondary voltages are 208, 480 and 600 volts. Electricians will talk about voltages of 120/208, 277/480 and 347/600. The first number is the phase to neutral voltage and the second number is the phase to phase voltage.
How do you obtain 277 volts single phase from a three phase 480?
277 volts is the phase to neutral voltage on a 480V 3-phase system. There is really no such thing as 277V 2-phase. Can you convert 277/480V 3-phase utility power to 120/240V single phase? Sure, but it will be expensive for any reasonable amount of power. You will need three transformers with 480:120 ratios. The primaries are each fed 480V A-B, B-C, and C-A. The three secondaries are connected in what is called a zig-zag configuration. The output will be 120/240V. This is rarely to never done with utility power using transformers, but it is routinely done on generators to obtain single-phase power when only a 3-phase generator is available. The generator must be reconnectable, that is, the three (sometimes six)windings must not be connected internally. One drawback is you can only load such a system to 66% of its rated power. So a 60KW 3-phase generator reconnected in a zig-zag configuration can only supply 40KW of single-phase power. But at least you don't need any transformers! Look at a generator manufacturer's website (Marathon has a good one). They have technical data on these types of arrangements. So while it is theoretically possible, its not really practical unless you are talking about a generator.
