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Old 05-12-2015, 03:13 AM   #1
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Default Cable Maximum Allowable Current

My factory will install 75kW 3 Phase Motor (415V) and by using 3C x 35mm2 Armoured Cable.

Based on IEC standard, is that the cable enough to withstand the maximum current produce from 75kW motor?

Please attached the IEC data if available.

Thanks.
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Old 05-13-2015, 12:14 PM   #2
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This I would use:

http://www.batt.co.uk/upload/files/4d5.pdf
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Old 05-17-2015, 06:20 AM   #3
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Without knowing intended installation method / environment / cable distance / motor wiring configuration I couldn't answer this (at least to Australian standard.)

75 kW is 130A, 35mm2 PVC insulated cable won't handle the temperature rise and will melt at this current draw, I'd be bumping it up to 50 mm.
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Old 05-22-2015, 03:06 AM   #4
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Quote:
Originally Posted by meadow View Post
Thanks. How to get higher mm2 data?
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Old 05-22-2015, 03:07 AM   #5
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Quote:
Originally Posted by maddhatter View Post
Without knowing intended installation method / environment / cable distance / motor wiring configuration I couldn't answer this (at least to Australian standard.)

75 kW is 130A, 35mm2 PVC insulated cable won't handle the temperature rise and will melt at this current draw, I'd be bumping it up to 50 mm.
It'll be on cable tray open air, the distance is 150m. The motor wiring you mean is Star / Delta is it? If yes, how much different for both? Thanks.
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Old 05-22-2015, 04:52 AM   #6
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To satisfy a voltage drop of 2.5% @ 130 Amps for PVC sheathed SWA you'd need to run 95mm2 cable.

If the motor was in 6 wire delta configuration, you could downsize the conductor size but you'd be better off just sticking with 95mm2.

I'd get my calcs independently verified before taking the word of some random on the internets.
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