Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning a three-phase steam generator and the provision of a 7kW supply, is answered by the NICEIC:
What is the correct calculation that will determine the rated current of the supply cable to the plant room?
Answer: The design current of the load may be calculated in two parts:
Three-phase load: I = 6000/1.732 x 400 = 8.6A/phase
(or I = 2000/230 = 8.6A/phase)
Single-phase load: I = 1000/230 = 4.34A
Therefore, cable sizing should proceed on the basis of a design current, Ib, of 8.6 + 4.34 = 12.94A.
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