Published: 22 July 2009
Category: Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, concerning BS7671 and three-phase motor wiring, is answered by the NICEIC:
Question: I have recently installed a four-core SWA to supply a three-phase motor. I've clearly marked the blue core with green/yellow on both ends and used it as the circuit protective conductor (CPC). Does this comply with the regulations? Also, is there any circumstance that this would be considered to be non-compliant with either the 16th or 17th Edition Wiring Regulations?
Answer: Regulation 514.3.2 (of the 17th Edition) states that every core of a cable shall be identifiable at its terminations and preferably throughout its length. Binding and sleeves for identification purposes shall comply with BS 3858 where appropriate.
Therefore, by marking the blue core with green/yellow, your installation should meet the requirement above.
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