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Cables in ducts underground

Apostolos

Good morning

I always thought that if you are installing cables underground (e.g. for external lighting, Vehicles Chargers, submains to another building etc) you always use SWA cables because this offers mechanical protection.

Is this coming from a specific regulation though?

Because I have someone saying I could use double insulated cables in the underground ducts if its a short run.

However this feels odd.

Is there any regulation that I can refer to?

Sorry for the ignorance

Cheers

Parents

  • Regulation 522.8.10. Cables buried in the ground have to be armoured, or be installed in underground conduits or ducts offering 'equivalent mechanical protection'.

    Unarmoured cables in 750N dual-walled ducts ('twin wall') to BS EN 61386-24 should be OK ... BUT you need to make sure:

    • water can't build up in there, as most cables (even XLPE SWA) are not submersible;
    • ends are suitably sealed against rodents, rabbits etc.
Reply

  • Regulation 522.8.10. Cables buried in the ground have to be armoured, or be installed in underground conduits or ducts offering 'equivalent mechanical protection'.

    Unarmoured cables in 750N dual-walled ducts ('twin wall') to BS EN 61386-24 should be OK ... BUT you need to make sure:

    • water can't build up in there, as most cables (even XLPE SWA) are not submersible;
    • ends are suitably sealed against rodents, rabbits etc.
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