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Twin & Earth to moveable Junction Boxes and Mains voltage downlights.

Andy Chapman

I am currently commenting on a Pre-Fabricated Bathroom Pod design where the designer is specifying a junction box for final connection & testing of the pod with the pod being wired in LSZH Tw & E cable. Slack should be left on cables so that the junction box can be dropped through an access hatch for connection purposes with future access to the junction box post completion for testing and inspection. 

I reject this design on the basis that Tw & E cabling is 'fixed wiring' and that in accordance with BS 7671 521.9.2 wiring should be undertaken using heavy duty flexible cables H07ZZ-F LSZH Flexible Mains and Control Cable - 1mm² to 630mm² in lieu of Tw & E, however the bathroom pod designer and the clients MEPH Technical Project Engineer are arguing against such wiring.

Can someone advise who is right or wrong.

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  • 0

    I think that we need to know more about how these pods will be used. Will they be moved whilst they are in use?

    (The mind boggles at the thought of taking a shower whilst a pod is being moved, but then again I have showered many times at sea.)

  • 0 in reply to Chris Pearson
    Chris Pearson said:
    I think that we need to know more about how these pods will be used. Will they be moved whilst they are in use?

    Agreed ... if we are talking 'mobile units' or 'transportable units' then Section 717 would apply, and Regulation 717.52.2 sets out requirements for wiring systems ... this requires either stranded (class 2) or flexible (class 5 or 6) conductors, and does NOT permit solid (class 1) conductors.

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  • 0 in reply to Chris Pearson
    Chris Pearson said:
    I think that we need to know more about how these pods will be used. Will they be moved whilst they are in use?

    Agreed ... if we are talking 'mobile units' or 'transportable units' then Section 717 would apply, and Regulation 717.52.2 sets out requirements for wiring systems ... this requires either stranded (class 2) or flexible (class 5 or 6) conductors, and does NOT permit solid (class 1) conductors.

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