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What are the advantages of using a three phase electricity service compared to a single phase service?
Answer for countries in Europe and other world areas running a 50 Hz supply service.
A 3 phase service allows three times the power to be supplied for a given conductor (cable) size. Each phase is at 230V to earth/neutral and 400V between phases. Common single phase standard domestic installations rated at 100 amps provide a total aailable power of 100A x 230V = 23,000 watts. (23 kilowatts)
Using the same size cable, a 100A three-phase installation has three service lines, each rated at 100A, making a total of 300A, at the same voltage, meaning that the total power available is 300A x 230 v = 69,000 watts. (69 kW) .
Alternatively the three-phase load can be connected between the live wires (delta connection), with 400 v across the lines. With the same 100 amp current in the supply lines, the current in each of the three loads is now 58 amps and the maximum power remains 69 kW.
This amount of power is often required for industrial and/or commercial installations, or perhaps domestic installations where a heavy load is connected.
It should be noted that the current carrying capacity of wire depends only on its size and is the same for all voltages and phases.
What else can I help you with?
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