answersLogoWhite

0


Best Answer

Yes, with an auto transformer. It is a transformer with multiple taps on the winding. Connect the 208 volts across the common tap and 208 volt tap. Then connect the load across the common tap and the 240 volt tap.

208 VAC usually comes from one floating side of a Delta 3 phase transformer.

240 VAC usually comes from a grounded center tapped transformer.

Using an autotransformer would be very hazardous and violate code. Probably tripping the 208 VAC breakers.

The only way to do it correctly would be with a transformer with a 208 VAC floating primary and a 240 VAC grounded center tapped secondary.

User Avatar

Wiki User

11y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

12y ago

Yes! Practical method for doing this will be using auto transformer.

208 VAC usually comes from one floating side of a Delta 3 phase transformer.

240 VAC usually comes from a grounded center tapped transformer.

Using an autotransformer would be very hazardous and violate code. Probably tripping the 208 VAC breakers.

The only way to do it correctly would be with a transformer with a 208 VAC floating primary and a 240 VAC grounded center tapped secondary.

This answer is:
User Avatar

User Avatar

Wiki User

13y ago

Well of course you can....but you'll need your engineering hat on or your good reading glasses. There are step up Transformers available that include power factor correction. Usually custom made or hard to find......haven't had to look for one so I could be wrong. A basic step down transformer can be used by reversing the primary and secondary input/output. In other words, use the primary as the secondary and secondary as primary. Be aware of your transformer ratings as you you will not want to exceed them. It will take a relatively larger step down transformer to do the work of "stepping up", than it would to do as intended. If in doubt of course, contact your local electrician.

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

Yes, you will need to use a step down transformer. Primary side at 240 volts three phase (this is a rare voltage these days as most utility companies are moving to wye three phase four wire connections). The secondary side of the transformer will be 208 volts. KVA size the transformer to the secondary side load current.

This answer is:
User Avatar

User Avatar

Wiki User

15y ago

You would be better to use a 220/480 transformer to provide the 480v, rather than try to modify the appliance

This answer is:
User Avatar

User Avatar

Wiki User

8y ago

Yes, by having correct turn ratio between primary and secondary winding. It is a step down transformer

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Can you convert 240V 3 phase to 208V 3 phase?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Continue Learning about Engineering

How does 120Volts single phase convert to 220Volts 3 phase when the 3 phase voltage should be 208Volts ie 120V x sq route of 3 equals 208V?

If you get 220 volts instead of 208 volts it means that the transformer supplying the circuit is wired in Delta with one of the legs center-tapped to ground.


Will a 240v 3 phase welder run better than 240v 1 phase?

Yes, because you will be able to maintain current flow between phases.


How can you get 240V single phase power from a 240V 3 phase service Can you just connect to two poles of the 240V 3 phase service?

I'm sure this isn't what you want to hear, but you probably need to ask an electrician familiar with your service and what you want to connect. As a general answer, you can connect a 240v line to line resistive load like an electric water heater to any 240v source. If you also need the 240v to have 120v line to neutral, like a 240v electric stove that contains a 120v clock and oven light, then its possible if the 3 phase power is connected in a "high delta" configuration, and you connect to the correct leads. If you have a high delta service and want to ignore the 3-phase power service and wire most or all of the loads in the building as a single phase load, the utility may have to be consulted.


What is the voltage for a single phase from a 415 volt 3 phase and neutral supply?

240V. 415 / 1.73 = 240


What is 208 - 230 volt three phase?

In the United States, 208v can be either. It is generally the voltage supplied by a 120/208v 3 phase system. However, using 2 legs of this 3 phase system is called single phase. I won't go into the reasons for that but just understand that 208v can be either single phase or 3 phase.

Related questions

Is there a way to rewire a 5hp 3phase motor to run off of 240v without buying additional equipment?

No, you only have phase a and b. The motor will run as smoothly as a 3 phase motor that has lost a leg of power. That is if the motor is designed for 208v in the first place. Not a good idea.


How can you get 240V single-phase power from a 240V 3-phase service Can you just connect to two poles of the 240V 3-phase service?

If the 240V 3-phase service is 240V phase-to-phase, then you can get 240V single-phase by simply picking two phases (poles, as used in the question) and connecting the load across them. This is simply one third of a standard delta connection. If you need 120V/240V split phase, i.e. with a neutral, as used in residential services, you will need a transformer. If the service is actually a four wire "quadraplex" service, however, you will probably already have that 120V/240V with neutral connection phase available. In this case, you will need to pick the two phases correctly in order to get the proper 120V service half.


What is average 208 230 voltage?

208V is one standard in the US for light commercial 3-phase power. It measures 208V phase to phase and 120V phase to neutral. 230 (or 240)V refers (in the US) to the common service supplied to residential. It is single-phase, with two hots and a neutral; 120-0-120. One hot and the neutral (120V) is used for receptacles and small appliances, both hots (240V) are used for large appliances, such as stoves, ovens, air conditioning, and water heater.


What is average 208-230 voltage?

208V is one standard in the US for light commercial 3-phase power. It measures 208V phase to phase and 120V phase to neutral. 230 (or 240)V refers (in the US) to the common service supplied to residential. It is single-phase, with two hots and a neutral; 120-0-120. One hot and the neutral (120V) is used for receptacles and small appliances, both hots (240V) are used for large appliances, such as stoves, ovens, air conditioning, and water heater.


How do you convert from 480 volt to 220 volt or 110 volt?

AC voltage conversions are usually done with transformers. Most commonly, a 3 phase 277/480v system is transformed to a 3 phase 120/208v system. You can, however transform to anything you like with the proper transformer. If you are trying to convert 480v single phase to 240v single phase, such as for home use, then ask for that type transformer. It would use only 2 phases of the 3 phase system. Using 2 phases is called single phase and there are reasons for this that are beyond the scope of this answer. 220v and 110v are field measurements of what is considered 240v and 120v when ordering equipment or applying code.


How does 120Volts single phase convert to 220Volts 3 phase when the 3 phase voltage should be 208Volts ie 120V x sq route of 3 equals 208V?

If you get 220 volts instead of 208 volts it means that the transformer supplying the circuit is wired in Delta with one of the legs center-tapped to ground.


How do you convert a 4 prong 240V outlet to a 3 prong 240V outlet?

Disregard the neutral


Will a 240v 3 phase welder run better than 240v 1 phase?

Yes, because you will be able to maintain current flow between phases.


What is considered high voltage in a 3 phase system?

There are two aspects to consider: 1. There are several different standard voltages and connections used by the power company in three phase service. 2. Depends if the voltage is measured phase-to-phase or phase-to-ground/neutral. The three phase-to-phase (A-B, B-C, C-A) voltages should be roughly equal. In typical service, they may be 208V or 240V. The phase-to-neutral voltages are sometimes intentionally different. For example, some 3-phase service has a "high leg" that is 208 volts with respect to ground (called a 3 phase high leg delta connection), while the other two legs are 120V with respect to ground, so that you can operate 120V, 240V and 3-phase loads from the same utility service. The important thing is you should always measure before connecting equipment. 208V will fry most 120V electronics.


How can you get the 240 volt cut back to 208 volt without the use of a transformer?

Based on the numbers in your question, I assume you're in the US. If the 240V comes from a utility transformer feeding the building, you're pretty much stuck with what you've got. 208V normally comes from 208/120 three-phase service. If you have 240V, that means you have single-phase service. 208V single-phase wouldn't work, because the receptacles would end up with 104V instead of the required 120, so what you're really asking is can you get 3-phase, 208/120V service. If this is a home, almost certainly the answer will be no. If it is a small commercial building, then it may be possible, but the utility will probably make you foot the bill, and it will cost plenty. And transformers (3 of them) would be involved.


How many amps in 17000 watts?

At 240v single phase it's 70.8 amps. If it runs on 2 wires plus ground, take the voltage rating of the equipment and divide that into the watts to get amps. At 480v 3 phase it's 25.8 amps. At 208v 3 phase it's 47.2 amps. <<>> There are zero amps in 14 kW. A voltage needs to be stated. I = W/E, Amps = Watts/Volts.


How can you get 240V single phase power from a 240V 3 phase service Can you just connect to two poles of the 240V 3 phase service?

I'm sure this isn't what you want to hear, but you probably need to ask an electrician familiar with your service and what you want to connect. As a general answer, you can connect a 240v line to line resistive load like an electric water heater to any 240v source. If you also need the 240v to have 120v line to neutral, like a 240v electric stove that contains a 120v clock and oven light, then its possible if the 3 phase power is connected in a "high delta" configuration, and you connect to the correct leads. If you have a high delta service and want to ignore the 3-phase power service and wire most or all of the loads in the building as a single phase load, the utility may have to be consulted.