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What will be the cable size for 300 A if the 3 phase voltage is 220 volts?
Wiki User
∙ 11y ago
At least 50mm but with all the de-rating factors it might be 70mm that's if its 2 cable single phase non armoured clipped direct. Check out the tables dopey!!!!
FYI 50 mm = 2 inches, 70 mm = 2.75 inches these are not wire sizes, sound more like cable outside diameters.
Correct answer
The wire size is dependant on the insulation factor on the wire. A few common insulations and corresponding wire sizes for 150 amps are - Size 0 R90 good for 155 amps, also with insulations of RW 75, TWH, TW75, good for 150 amps. Size 000 TW good for 165 amps.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoA 300 MCM
conductor with an insulation factor of 90 degrees C is rated at 320 amps. Because it is a motor feeder it has to be sized at 124% of the motors full load amperage. 300 x 125% = 375 amps.
A 400 MCM conductor with an insulation factor of 90 degrees C is rated at 380 amps. This will be the cable size for the motor state.
Wiki User
∙ 12y ago#4 thhn wire
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First of all find out what voltage the motor is designed to work on.
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To answer this question a voltage is needed.
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