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Flexible cables in stud walls

Tolly

Hi all, I'm new to the forum.

Tables of ccc/It are available for the likes of T&E cables in stud walls. However, how can the ccc of flexible cables be determined when used in stud walls - I've come across some 2.5mm2 3 core (what appears to be plastic sheathed) flexibles in a non thermally insulated stud wall feeding 13A sockets on a 20 CB?

Thanks

T

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  • 0

    Only table 4D5 is specific to T&E cables - all the others are general and apply to circular cables in general. The only gotcha is the additional correction factor for flexible conductors (0.95 for ≤16mm²) (see section 2.4 in appendix 4 of BS 7671). So you're probably looking at method B and table 4D2A - so 23A for 2.5mm² with an additional 0.95 factor making it 21.85A.

      - Andy.

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  • 0

    Only table 4D5 is specific to T&E cables - all the others are general and apply to circular cables in general. The only gotcha is the additional correction factor for flexible conductors (0.95 for ≤16mm²) (see section 2.4 in appendix 4 of BS 7671). So you're probably looking at method B and table 4D2A - so 23A for 2.5mm² with an additional 0.95 factor making it 21.85A.

      - Andy.

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  • 0 in reply to AJJewsbury

    Thank you for your reply.

    Yes, I'd picked up on the correction factor and RM B, but comparing ccc's of table 4F3A with RM E of 4D2A (if that's an appropriate comparison), see that apart from for 2.5mm2, the latter has more generous allowances than the former, so wasn't sure if RM B would be a suitable comparison, because if 4D2A is not as generous with flexes, that could put it below 20A.

    T 

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