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Wiring regulations and their application to optical fibre in the home.

Timothy Durkin

I understand that telecoms wiring is subject to section 521.10.202 of BS7671:2018. Cat 5 ethernet cable is just as capable of causing entanglement of emergency service personnel as a mains power cable. I wanted to know if the tensile strength of the cable in question may be taken into consideration or if any provision is made for very light cable?  Some of the single core buffer fibre I am working with has the tensile capacity of sewing cotton and crumbles in fire.  Even very small metal clips do not offer the clamping force needed to support the vertical runs and I wanted to use some intumescent caulking.

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    It seems to me that the manufacturer has coordinated the temperature at which their adhesive fails with that at which their cable does.

    If you use intumescent adhesive, there could then be no such close coordination and the adhesive could turn to mush before the cable does. And you would be responsible, as the designer, for the system you install. Probably low risk but worth considering.

    Edit: thinking that you can get high temperature silicone sealants that are paintable, which might be a better solution than intumescent ones

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    It seems to me that the manufacturer has coordinated the temperature at which their adhesive fails with that at which their cable does.

    If you use intumescent adhesive, there could then be no such close coordination and the adhesive could turn to mush before the cable does. And you would be responsible, as the designer, for the system you install. Probably low risk but worth considering.

    Edit: thinking that you can get high temperature silicone sealants that are paintable, which might be a better solution than intumescent ones

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