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You don't. If the three phase power has one of the phases center-tapped as a neutral for 120/240 you can do it. This is known as quadraplex wiring. Without that neutral, you must have a transformer.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
What else can I help you with?
How do you covert 120 volts to 208 volts?
Single phase or three phase? 120/208 would be measured hot to ground for 120 and hot to hot (phase to phase) for the 208 reading. Any hot to ground will read 120 and any two phases together will read 208.
Can you use 240 volts with a 120 volt supply?
No, it is not possible to use 240 volts with a 120 volt supply directly. You would need a transformer to step up the voltage from 120 volts to 240 volts. Attempting to use 240 volts with a 120 volt supply without a transformer can damage equipment and pose a safety hazard.
How do you convert 480v to 120v?
to derive 120 volts from 480 volts you have to use a transformer, based on your needs. If you needed 100 amps at 120 volt single phase you would need a 12kva transformer. This is just an example.
How do you convert 277v to 120v for an outlet?
i think you just have to change the breaker from a 277 to a 120. 277 breakers are usually a 2 pole breaker and 120 is a single pole breaker. NO. 277v is not two poles, it is one pole, one single pole breaker in a 480 volt 3 phase system (typically). If you want 120 volts from a 277 volt source you need a step down transformer 277 volt to 120 volt , or 480/277 to 120/208 .
Why do you use a neutral wire in a circuit?
The power company uses a single transformer outside your home to reduce the voltage from the transmission line voltage down to the 240/120 volts that you can use when you plug in your appliances. The power company is trying to be responsible with their money when they put that transformer out there, so they use a transformer that can provide both 240 Volts and 120 Volts, at the same time. To do that, the output of the transformer is divided into two halves; one half provides 120 Volts, and the other half provides 120 Volts, with a "common" or "center tap" in the center of the 240 Volt transformer winding. It isn't a coincidence that your 240 volt plug that operates the electric range or electric dryer is twice the voltage of the 120 volt plug that operates your TV. By using half of the output from the transformer to provide your 120 Volt service, you are technically using the center tap/Common wire as one of the current carriers for the circuit. In theory, the common wire should be identical to the ground wire, but because real life isn't quite the same as the theoretic, it is necessary to treat them differently. In some VERY OLD neighborhoods there were no 240 volt transformers, and as such, no neutral/common wire.
How do you covert 120 volts to 208 volts?
Single phase or three phase? 120/208 would be measured hot to ground for 120 and hot to hot (phase to phase) for the 208 reading. Any hot to ground will read 120 and any two phases together will read 208.
How can you get a 240V single-phase power from a 120V 3-phase service?
First of all there is no common three phase 120 volt service. There is in North America a three wire 120/240 volt single phase service. That being said, if you want to change a 120 volt source to 240 volts it must be done with a transformer. Its classification is a step up transformer. The primary side of the transformer H1 - H2 will be connected to the 120 volts. The secondary side of the transformer X1 - X2 will be connected to the 240 volt load. The transformer is sized by the current required by the 240 volt load.
Can you convert three phase 480 volts to single phase 110 volts?
If you have a 220v three phase delta system, the phase-to-phase voltage is 220v single phase; hence, no conversion is necessary. Don't worry about 220-240v rating, the voltage rating is nominal. Your 110v single phase has actually already be taken from a center-tapped transformer on your three phase system.
What is the difference between step up and step down?
in transformers for instance a stepup transformer does exactly that, steps up the voltageAND/OR theamperage and a step down transformer reduces the same. if you have a machine that operates on say 120 volts alternating current single phase and your building or power supply in your buildingis set up for or delivers480 volts alternating current-three phase you will need a step down transformer to operate the machine.
Can a 3 three phase motor be run with a scot t transformer on a 2 phase supply?
A Scott transformer converts 3-phase to 2-phase and vice versa, so if you get a Scott transformer it can convert a 2-phase supply into 3-phase for the motor. Caution: the 2-phase supply has to be a genuine 2-phase as defined, with 90 degrees phase between the two phases, and these are extremely uncommon. A Scott transformer CANNOT be used with the split-phase supply found in many US homes which have a 240 v single-phase transformer with the centre earthed and connected to a neutral wire to produce two 120 v circuits.
Can you use 240 volts with a 120 volt supply?
No, it is not possible to use 240 volts with a 120 volt supply directly. You would need a transformer to step up the voltage from 120 volts to 240 volts. Attempting to use 240 volts with a 120 volt supply without a transformer can damage equipment and pose a safety hazard.
Can you step up 12 volts AC TO 120 volts AC?
Yes this can be done with a step up transformer. Keep in mind that it is a 10 : 1 ratio. For every 1 amp that you want out of the 120 volt secondary there will have to be 10 amp input on the primary. This can lead to a very big wire size on the primary coil.
How do you calculate amperage of a 3 phase transformer?
Total KVA of the transformer divided by (square root of 3 times the voltage). This will give the individual phase currents. These individual phase currents will be 120 degrees out of phase with each other.
Does a 3 phase motor starter with a 120 volt coil need a neutral to the coil?
Usually for this type of installation there is a control transformer installed in the starter enclosure. The primary of the transformer is the motors line voltage and the secondary is the control voltage which is usually 120 volts. In Canada the control transformer needs fusing on the secondary side of the transformer. In the US the transformer needs fusing on the primary and secondary sides of the transformer. The secondary side of the transformer's terminals are labeled X1 and X2. The X2 lead is grounded to the starter's enclosure. From this point out the wire is then termed the circuit's neutral wire. This wire then connects to one side of the magnetic starters draw in coil. Yes, 120 volt coil would require a neutral, this could be derived from the control transformer if it has one or from an external source.
Can you get 110 volts from 277volts?
The voltage of 277 is the wye connection of a 480 volt three phase supply. The only way to reduce 277 to 120 volts is with a step down transformer.
Why is a three phase four wire distribution system used?
A three phase four wire system allows for two voltages from a single three phase transformer. The transformer configuration is a wye or star connection. It is used in commercial and industrial applications. Apartment buildings are now starting to use a three phase four wire service distribution system. Some wye connection voltages are 120/208 volts, 480/277, and 600/347. The lower voltage is derived from the sq root of 3 divided into the three phase voltage.
Is home electricity 3 phase?
No, in North America most homes are wired to a single phase transformer. That transformer is connected to a three phase power grid. Some of the newer apartment buildings and condominium complexes have three phase systems in them. Their voltages are 120/208 as compared to a homes single phase connection of 120/240 volts.AnswerSome European countries, such as here in Cyprus, have three-phase residential supplies as standard for some reason -can't quite figure out why it should be necessary, though!
