Published:
2 October 2009
Category:
Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, an unusual one, concerns a three-phase system and cable size determination. It is answered by SELECT:
Question: I have a problem in that I can't remember how to work out the current for a three-phase system with only the power figures to go on. I need to work out the cable needed for a three-phase system using 80kW on a four-wire cable. So how do I do it? Any help would be gratefully received.
Answer: the calculation is as follows:
Power (kW) = (square root of 3) x (volts) x (amps) x (power factor) divided by 1000
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