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Cable terminations to lighting control gear

Stuart Urban

I have come across a lot of flexible cable terminations to lighting control gear where the sheath of the cable is removed before entering the control gear and the cores of the cable are clamped rather than the sheath. The control gear is supplied by the manufacturer complete with flex and a plug for attachment to a modular wiring system.  The manufacturer says it complies with the product standard BS EN 60598.

 

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    BS EN IEC 60598-1:2021

     

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    Well, it does not say that wires should be sheathed, and when clamped the wires cannot move and abrade, so clearly it complies with that rule as written.

    Quite often there is a failure for product standards and wiring regs to join up.

    there is a similar apparent failure with non- earthed metal bodied lamp fittings, where the cable and its supports provide a functional equivalent to double insulation, with what looks like unsheathed (single insulated wire), but tested to a higher voltage. In fact that is not much of a test, as even telephone wire pair will hold off a kV if the ends are kept apart.

    Mike.

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    Do you not thing that the cores of the cable will be strained by being clamped rather than the sheath being clamped?

    Do you think the designer of the control gear intended cable cores to be clamped?

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    It is hard to imagine anyone being happy with it though

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    The picture seems to show a braided sleeve. It reminds me a bit of the old school method of connecting hot fittings where the core insulation was oversleeved or replaced by heat-resistant (usually glass fibre based) sleeving. I wonder if they're trying something similar with the sheath - so it's not so much missing the sheath at the point of entry, but has been provided with a alternative sheath (possibly one more suitable for the conditions at that point). Just a thought.

       - Andy.

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