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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?
The standard voltage for 3-phase power systems is usually set to 440V to balance the need for efficient power distribution with equipment safety requirements. This voltage level allows for adequate power delivery while also helping to minimize risks associated with higher voltages, such as insulation breakdown and electrical accidents.
