You need to know the amperage requirement of the pump and then you can calculate the wire size.
How to calculate a cable size of 3kw motor
The speed of motion generated by a motor is not a function of its nominal power. The nominal power, 3kW in this example, is an indicator for the electric power consumed, and for the force available in the direction of motion. The speed of a motor is determined by its construction, and can cover an extremely wide range regardless of its power.
Power = E2 / RResistance = E2 / power = (240)2 / 3,000 = 19.2 ohmsCurrent = E / R = 240 / 19.2 = 12.5 amperes
Watts and horsepower are directly related as they are both measurements of power. 1hp = 745.6998 watts. So 3kW = 3000W / 745.6998 W/hp = 4.023hp You need a minimum of 4hp, which will give you a max of 2982W before any losses in your generator. You should probably go with a 4.5 or 5 horse motor.
The 50hp motor has a current rating of 55.4 amps if its power factor is 0.8.Another Answer:One horsepower (electric motor) is 746 watts, so 50 horsepower is 37.3 KW. Assumed power factor is 0.8, so divide by 0.8 to get 46.6 KVA. Assumed efficiency is 0.95, so divide by 0.95 to get 49.1 KVA. The motor is three phase, so divide by three to get 16.4 KVA per winding. It is 480V so divide by 480 to get 34.1 amperes per winding. Assumed configuration is to run on delta, so multiply by 1.732 (square root of 3) to get 59.0 amperes per phase. This is very close to the 55.4 stated before.
How to calculate a cable size of 3kw motor
Assuming being fed by c32 breaker for start load minimum cable size SWA is 70mm which will go to 456 meters
3000w / 220volts = 13.63amps 3000w/ 110volts = 27.27amps
To answer this question a voltage must be stated.
It depends on the element size that heats the water. The average 150L geyser uses a 3kW element, which will take about 2.5h to heat the water from cold to 70'C. If you "empty" the geyser twice daily, which is an unlikely maximum, it'll use 15 kWh of electricity.
The fuse protects the cable it is feeding therefore in UK upto 10A for 1.0mm cable, upto 15A for 1.5mm cable and upto 20A for 2.5mm cable. This is for installation type (solid core copper) cable not flex. In the UK and the rest of the EU (230V) 1 Kw load = 4A so 5A fuse should be OK. 2KW = 8A, 3KW = 12A so use 13A Fuse.
A 13 Amp fuse (brown) is needed for a 3kw heater. <<>> Answer for USA, Canada and countries running a 60 Hz power supply service. 3000 watts at 120 volts = 25 amps, 3000 watts at 240 volts = 12.5 amps.
3KW
You should contact a certified, and licensed electrician.
3kW is 3,000 watts.
The formula you are looking for is I = Watts/ Voltage, I = 3000/voltage.
The speed of motion generated by a motor is not a function of its nominal power. The nominal power, 3kW in this example, is an indicator for the electric power consumed, and for the force available in the direction of motion. The speed of a motor is determined by its construction, and can cover an extremely wide range regardless of its power.