Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning voltage drop calculations, is answered by SELECT:
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| Three-core amoured cable - but what volt drop? |
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Question: When calculating voltage drop on a single-phase 25mm2, three-core (integral CPC) armoured cable, which column in Table 4E4B in BS7671 should be used - column 3 (two-core cable, single-phase AC) or column 4 (three- or four-core cable, three-phase AC)?
Answer: Use column 3 - two-core cable. The CPC is not a current carrying conductor!
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