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3 Phase Power: What is it and how does it work?

Introduction: what is three phase power?

Three phase power is a type of alternating current (AC) that is used to power larger and more powerful appliances such as air conditioning units in your home. It is made up of three sinusoidal waveforms that are offset by one-third of a cycle. This offsetting creates a continuous rotating magnetic field, which makes three phase power more efficient than single phase power.

With three phase power, you can get 240V and 415V power from the same power source.

What is the main difference between single phase and 3 phase power?

A standard single phase power supply has two wires, one active and one neutral. It provides 240 volts of power and is used in most residential house and businesses.  

Three phase power has four wires, three actives and one neutral, and can supply 240V and 415V power. When we bring in a three-phase supply, we triple the amount of power available. This is because we have access to all three phases, implying that we have three single-phase supply connected.

Three phase power is more efficient than single phase power, because it allows for higher currents and voltages without experiencing losses from inductive impedance. Additionally, three phase systems are less likely to experience voltage imbalances, which can damage equipment or cause blackouts.

How does three phase power work?

Three phase power is a type of electrical power that is typically used in larger homesand commercial settings. It is generated by three separate wires, each carrying an alternating current (AC) that is out of phase with the other two by one-third of a cycle. This creates a rotating magnetic field, which can be harnessed to power electric motors and other equipment.

How do I know if I have 3 phase power at home?

Have a look at your main switchboard/meter board. Single phase electriciy setups have a single “service fuse,” while three phase electricity setups have three fuses. The service fuses are the big, rectangular, black fuses found in your meter board.

The second way to tell is by looking at your main switch. If it is 1 pole wide, or one finger in width, then your electricity supply is single phase. If the main switch has three poles, which is about three fingers in width, you presumably have three-phase power.

Advantages of three phase power

There are several advantages to using three-phase power. First, it is more efficient than single-phase power. This means that less energy is lost in transmission and that the overall system requires less energy to run. Second, three-phase power can provide more power to a given area than single-phase power. This is because each phase carries a larger amount of current than a single phase. Finally, three-phase systems are typically more reliable than single-phase systems since they are less likely to experience problems with voltage sag or voltage surges.

Disadvantages of three phase power

Three phase power is not always the best option, and there are several disadvantages to using it. One downside is that three phase power can be more expensive to install and maintain than single phase power. Three phase power also requires special equipment that may not be readily available in some areas. Another disadvantage of three phase power is that it can cause interference with other electronic equipment if not properly installed and maintained.


When it comes to electric power, there are two main types: single phase and three phase. Three phase power is more efficient than single phase power and is typically used in larger homes that hae a high demand for electricity.

If you would like to get a quote on getting 3 phase power setup on your property give us a call on (02) 8898 0200 and we can let you know where to start.

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