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PV flush downleads

lyledunn

New 3-storey house. PV panels on roof and inverter in garage on ground floor. Not unreasonably the client wants the downleads flush mounted. The proposal was to flush mount them in the masonry walls in steel conduit for the route from the loft area, down through bedroom on the top floor and TV room on first floor to garage on ground. No through boxes or the like to indicate cabling below. This is not a one-off situation as the client has a site of 40+ units. Done carefully, I can’t see too much of an issue but I just feel a tad uncomfortable. Any views?

Parents
  • 0

    it does not need to provide rapid ADS, it just needs to ensure the drill bit is earthed, and provide a bonding like return to earth path - same thinking as the old bathroom bonding without the fast acting RCD.

    Going down the section 419 route then? (to meet BS 7671 requirements) Wouldn't that then also require supplementary bonding to everything within reach of the conduit (or drill)?

       - Andy.

Reply
  • 0

    it does not need to provide rapid ADS, it just needs to ensure the drill bit is earthed, and provide a bonding like return to earth path - same thinking as the old bathroom bonding without the fast acting RCD.

    Going down the section 419 route then? (to meet BS 7671 requirements) Wouldn't that then also require supplementary bonding to everything within reach of the conduit (or drill)?

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Sort of, but to be fair I'm not sure that any of the UK regs are intended specifically to cover this case very well, so my advice is based on what would be safest - if say the negative wire is grounded, and then you drill into  the positive at 300Volts DC but current limited to 10A at full sunshine, what do you expect to happen ?

    Or, put another way would you not earth the metal conduit ?

    M.

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