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Cables are rated are by the max current they can supply. To work out the current load you need to divide the Watts by the Voltage (which is either 120 or 240 depending on where you are).
In the UK: 4kW/240V = 4000/240 = 16Amps, so the cable would probably be rated for 20 amps.
In the US the current is 32Amps, so the cable would probably be rated for 50 amps.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoThe most accurate sizing of wire for motor feeders is the amperage taken from the motor's nameplate. Re ask the question with the amperage of the motor.
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