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What is the difference between single phase and three phase electrical power services?
Answer for USA, Canada and countries using similar 60Hz household electricity supplies This is a very simplified answer: Single-phase has two hot "legs". Each are 120 V. for a total of 240 V. A neutral wire (white in color) will give you 120 V. When straight 240V is needed, a neutral isn't necessary. 3-Phase has 3 hot legs for a total of 480V. This voltage is generally used for motors in industrial and commercial settings. This voltage can be "stepped down" via use of a step-down transformer. This converts 480V into 120/208/277. 120V is used for common appliances. 208V can be used for dryers and ranges (if they're rated for 208). 277V is used for lighting circuits (again, lighting must be rated for 277V). 3-phase is used in commercial and industrial, including schools. A neutral is needed for 120V and 277V and is generally gray.For more information see the answers to the Related Questions shown below.
Where does you neutral come from single phase transformer?
In a single phase system the neutral wire is the return path of the circuit and may be near ground potential, in multiphase systems it carries the unbalanced current.In a single phase system where only one "hot" wire supplies current to the load, the "neutral" wire completes the circuit and carries the current flowing from the load back to the power station.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 JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
How do you tell how many poles a 3 phase 480 volt motor has?
It is based on the RPM of the motor. Use the following formulas for 50 and 60 Hertz. The mathematical formula is Frequency in Hertz times 60 (for seconds in a minute) times two (for the positive and negative pulses in the cycle) divided by the number of poles. For 60 hertz, the formula would be, 60 x 60 x 2 = 7,200 no load RPM divided by the number of poles will give you the nameplate RPM of the motor. eg from above formula 7200/2 pole = 3600 RPM, 7200/4 = 1800 RPM, 7200/6 = 1200 RPM
What is the three phase voltage in America?
It varies by location and application. I will assume for this answer that we are talking low voltage (<1000 VAC): Grounded Wye Systems: 208/120 (Common) 480/277 (Common) 600/347 (Rare) Delta: 480 (ungrounded) 240/120 (grounded high-leg) 480/480 (corner grounded- rare and dangerous) The convention used above i.e. 208/120 designates the phase-phase voltage (208) and the phase to ground voltage (120). Some of the common Medium Voltage systems: 4.16 kV, 7.2 kV, 12.47 kV, 13.8kV
Will changing an electric motors input from 115 volt to 230 volt cause motor to run at 3450?
Yes, IF the motor is a dual-voltage motor to begin with. There should be re-connection instructions on the motor nameplate, or available from the manufacturer. The motor will list both voltages on the nameplate. If it only lists one, then the motor cannot be re-wired to a different voltage.
