Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, about SY cable steel wire braiding, is answered by BASEC:
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Question: Can the steel wire braiding of a two-core SY cable be used as a circuit protective conductor ( CPC), or is the braiding only for physical protection and a three-core SY cable be used?
Answer: The braiding on a cable, such as SY, is not intended as a CPC (for UK Wiring Regulations purposes), so a suitable core should be used. Such braiding is intended as mechanical protection.
If the installation is within the scope of the IEE Wiring Regulations BS 7671 (17th Edition), and as this cable type is not specifically listed in the Wiring Regulations, a verification of safety needs to be conducted in accordance with Clause 511, and appropriate details of the departures from BS 7671 entered on the installation certificate.
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