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DC Cable Through Attic

  • 22-03-2026 09:55AM
    #1
    Dr.Tom
    Registered Users, Registered Users 2 Posts: 361 ✭✭


    I will be doing it due to panel orientation on one string and distance from inverter location.

    Who has done it?

    What conduit did you use?



Comments

  • #2
    G-Man
    Registered Users, Registered Users 2 Posts: 620 ✭✭✭G-Man


    My lads used regular looking 30mm corrugated flexi, it seems reasonably tough and easy to fit... Now they were skimpy with it and only put it in places of the attic where they though people could easily reach.. I think this is a shortcoming, once you go in an attic, all parts are 'easily' reached,.



  • #3
    Dr.Tom
    Registered Users, Registered Users 2 Posts: 361 ✭✭Dr.Tom


    https://www.boards.ie/discussion/comment/124331653#Comment_124331653

    Thanks for that.

    I’m thinking solid 25mm PCV pipe for mine and flexi conduit at the ends and bends.



  • #4
    SD_DRACULA
    Registered Users, Registered Users 2 Posts: 2,728 ✭✭✭SD_DRACULA


    https://www.boards.ie/discussion/comment/124331665#Comment_124331665

    I'd avoid the attic completely if possible, for peace of mind



  • #5
    Dr.Tom
    Registered Users, Registered Users 2 Posts: 361 ✭✭Dr.Tom


    https://www.boards.ie/discussion/comment/124331683#Comment_124331683

    Unfortunately the most direct route is straight line through the attic. Putting a single string fireman’s switch at entry point.

    Do you know what the alternative for running DC cable along the roof is?



  • #6
    Buffman
    Registered Users, Registered Users 2 Posts: 3,431 ✭✭✭Buffman


    Back when it was the done thing to put everything in the attic, all the DC stuff was up there so very common.

    For routing and trunking just do it the same as you would do if it was AC cable.

    Personally I normally go 20/25mm flexible conduit as far as the DC isolator for ease/speed and will then normally switch to solid trunking around the inverter to keep everything neat and matching.

    The below is a general 'signature' and not part of any post:

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    Buy drinks in 3L or bigger plastic bottles or glass bottles or cartons to avoid the DRS fee.

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  • #7
    Dr.Tom
    Registered Users, Registered Users 2 Posts: 361 ✭✭Dr.Tom


    https://www.boards.ie/discussion/comment/124332193#Comment_124332193

    Thanks for your reply



  • #8
    bullit_dodger
    Registered Users, Registered Users 2 Posts: 2,770 ✭✭✭bullit_dodger


    Just a word of advice - don't put AC and DC in the same trunking/conduit. Seperate them by a few centimeters at least.

    AC can induce some noise in DC circuits which can be problematic in rare situations, so the guidance is that it's best to seperate them



  • #9
    SD_DRACULA
    Registered Users, Registered Users 2 Posts: 2,728 ✭✭✭SD_DRACULA


    https://www.boards.ie/discussion/comment/124340746#Comment_124340746

    Didn't know about this and I have a run of about 7m where there's both AC and DC cables going to the inverter, haven't noticed anything weird (yet) what can happen exactly?



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