formula for incomer breaker size calculation of powerfactor
correction unit
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Answer Posted / matt
Given a system power factor of 0.9, PFC unit of 50kvar we can work out the following
50/0.9 = 56 A real current
56^2 * 50^2 = 75 A apparent current
Cable capacity - 75 * 1.35 = 100 A
Factor of 1.35 used for over rated capacitors as per
industry standards.
Breaker shall be rated at less than the cable capacity but greater than 75A. Increase cable size to suit breaker breaker sizing if required.
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