How to calculate a cable size of 3kw motor
3 core 35 sq mm alu. Or 3 core 25 sq mm cup.
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The wire size and the circuit breaker for a 125 hp motor must consider the length of lead wire to the motor (essentially the distance of the motor from the supply). 125 hp is a VERY large motor and would be used only in industrial applications. You will need to consult a technician for proper advice, but the general answer to your question follows: The current draw on such a large motor would be approximately 300 amps. That is very large, and would require a wire size of 0000 AWG or 750M. 0000 AWG is 0.46 inches (11.68 mm) in diameter. As you can see, the wire is very large. It is not something you could install yourself.
Find out how much current the motor draws, then look up wire tables to find out the size of wire. Ask an electrician if you are not unfamiliar with this because working at 6.6 kV is definitely lethal for the unqualified.
First of all find out what voltage the motor is designed to work on.
3 core 35 sq mm alu. Or 3 core 25 sq mm cup.
This is a voltage drop question. A voltage must be stated to answer this question.
Wire size is based on the amperage capacity of the service it is feeding. You tell me the service amps and I can tell you the wire size.
How do u wire a 1 to 3phase rotoverter
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570amps on 3phase 415volts
A #4 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 85 amps. This size wire will also be the same for a load amperage of 68 amps as the next wire size smaller #6 is only rated at 65 amps.
Depends on the current rating which should be on the motor.
Wire size for any piece of equipment is based on the equipments load amperage. The higher the amperage that larger the wire size has to be. For motor loads the motor's amperage has to be increased by 25% to size the conductor. Example, a 10 amp motor load current plus 25% equals 12.5 amps. This would boost the wire size from a #14 to a #12 conductor. This additional amperage increasing is also used for transformer conductor sizing.
Wire size is based on the amperage of the load. Without knowing what the motors's full load amperage is, an answer can not be given.
The ground wire size is determined from the current carrying capacity of the motor feeders.
12/2 with ground.