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Answer for UK, Europe and countries running a 50 Hz supply service.
Standard voltages are used so that equipment can be produced cheaply in quantity. It is not economic to use a lot of different voltages.
The low-voltage standards for electricity in Europe is 230 v single phase, 400 v 3-phase.
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Answer for USA, Canada and countries running a 60 Hz supply service.
Low voltage in North America 120/240 single phase. Main three phase voltages are 120/208, 277/480 and 347/600. Any leg to ground on the three phase or leg to leg voltages can also be classed as single phase.
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How do you calculate mf in 3 pahse meter?
The multiplication factor (MF) in a three-phase meter is typically calculated by dividing the rated primary current of the current transformer by the maximum current that can be measured by the meter. The formula is MF = Rated Primary Current / Maximum Measurable Current. This factor is used to adjust the meter reading to reflect the actual current flowing in the circuit.
Why 3-phase voltage is 440V instead of 660V?
Three-phase is transmitted at many different voltages but a 440 v 3-ph supply has 440 v between the phase wires by convention and is used in supplying power to groups of houses or small businesses. The voltage between any of the phases and neutral is 440/sqrt(3) which equals 254 v. A typical 440 v 3-ph transformer might be able to supply 700 amps, which gives 180 kVA, enough for about 90 houses.
