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L.V. and E.L.V, cables running together.

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Somebody recently referred to this video clip. https://www.youtube.com/watch?v=IMD5VwroawU Time 5.50 onwards approx.


In the plaster of the wall, household mains cables are run with an E.L.V. bell wire in metal channelling.


Is this really so bad, as the singles are double insulated 6181Y? Would we worry about a bell wire crossing a T&E cable run surfaced wired?


Comments please.


Z.
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    I doubt that is a big issue in practice, but strictly speaking, if LV and ELV cables are to share the same containment, then BOTH must be insulated for the highest voltage present.

    If the bell wire shown is only ELV insulated, then it should not be in the same containment as the mains voltage cables.


    Had the bell circuit been wired in mains rated cable, then I see no problem. I have used 300/500 volt 0.5mm flex to wire bell circuits and consider this to be acceptable in the same enclosure as mains power cables.


    My personal view is that the requirements are unduly onerous. If the insulated and sheathed mains cables are safe to touch, then in MY VIEW they are safe in contact with single insulated bell wire. However my personal view does not override the requirements for ALL cables to be insulated for the highest voltage present.
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  • 0
    I doubt that is a big issue in practice, but strictly speaking, if LV and ELV cables are to share the same containment, then BOTH must be insulated for the highest voltage present.

    If the bell wire shown is only ELV insulated, then it should not be in the same containment as the mains voltage cables.


    Had the bell circuit been wired in mains rated cable, then I see no problem. I have used 300/500 volt 0.5mm flex to wire bell circuits and consider this to be acceptable in the same enclosure as mains power cables.


    My personal view is that the requirements are unduly onerous. If the insulated and sheathed mains cables are safe to touch, then in MY VIEW they are safe in contact with single insulated bell wire. However my personal view does not override the requirements for ALL cables to be insulated for the highest voltage present.
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