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Because a three-phase system needs half the amount of wire to transmit power compared to three single-phase systems.
With a balanced three-phase system the three live wires are phased so that the sum of the currents is always zero, which means that if the three neutral wires are combined, the current in the neutral is zero. Therefore the original three neutral wires can be removed, leaving only the three live wires.
In practice a neutral wire is still included in three-phase four-wire systems when the load is potentially unbalanced, as for example in neighbouring houses which use different phases of a three-phase system for their individual single-phase supplies.
What else can I help you with?
What are the three types of phase on its final phase?
single phase, double phase & three phase
Two phase instruments?
There is no such thing as a two phase instrument. There is only single phase and three phase. You can only have: single phase/ one pole single phase/ two pole three phase/ three pole
Single phase and three phase circuit?
Yes, there is a difference between single phase and three phase circuits.
Is three phase is ac or dc?
Three phase is ac
How do you start a three phase motor to a single phase power supply?
You don't. A three phase motor will not start unless it is connected to a three phase supply.
How do you run a 220V from the box?
Three phase or two phase? Three phase requires three large wires for the current needed
What circuit you can use to run three phase motor?
It must be a three phase supply service to run a three phase motor.
Where are three phase transformer systems used?
Any where that a three phase supply distribution is needed to operate three phase equipment.
What is the difference between a one phase and a three phase motor. And if a three phase motor is given a single phase supply will it run or not?
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
How do you use a one phase motor in place of a three phase motor?
To use a single/one phase motor instead of a three phase motor is possible if you have a three phase power supply as you will only need to tap one of the three phases together with neutral and an earthwire, however to use a three phase motor instead of a single phase will require the provision of three phase power supply.
Can you make a three phase light ballast work on 110 or even 220?
No. A three-phase ballast requires three-phase power
What does one mean by 3-phase loads?
Electrical circuits are designed in two phase types. Either single phase or three phase. A single phase is one wave of electricity while three phase is three waves that are offset.
