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Clearance b/n electrical wires and wall thimble within wall

Post in 'It's a Gas!' started by TomG, Jan 1, 2011.

  1. TomG

    TomG New Member

    Joined:
    Dec 10, 2010
    Messages:
    4
    Loc:
    SE Pennsylvania
    Hello,

    A dealer will be installing a Quadrafire natural gas freestanding stove that will be directly vented through the wall. Unfortunately, the spot where the vent pipe is going contains wires. I am going to move the wires out of the way as much as I can. The owners manual says that there must be a 10" x 10" square hole in the wall to accomodate the wall thimble. My question is: how far must electrical wires (inside the wall cavity) be from the wall thimble? I did not see reference to this in the installation manual. Thank you for your help!

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  2. jtp10181

    jtp10181 Minister of Fire

    Joined:
    Feb 26, 2007
    Messages:
    3,724
    Loc:
    Madison, WI
    The 10x10 box out is constructed out of the same size lumber as the wall framing. Nothing can be in that space except AIR and the vent pipe.

    If you really had to have the wire run through there, you would want it on the bottom side, and it needs to be 1" away from the vent pipe itself. All penetrations in the box out should be sealed.
  3. Install fire 1

    Install fire 1 Member

    Joined:
    Dec 5, 2010
    Messages:
    159
    Loc:
    Canada.
    Wall thimbles are zero clearance on the outside so a wire running vertical up the stud will be fine.

    The top will be the hottest sides and bottom are fine. Can't be on the inside of the firestop.

    If its possible, put a thin piece of roxul between the outside of the wall thimble and the wire for added piece of mind.
  4. jtp10181

    jtp10181 Minister of Fire

    Joined:
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    Messages:
    3,724
    Loc:
    Madison, WI
    Oh yeah, I was only thinking of a horizontal wire. As he said, a vertical wire on a stud should be fine as long as it is outside the thimble which will be over 1" away on the side. A lot of the new pipe does not even have thimbles anymore, the framed out box becomes the thimble, in which case the 1" clearance on sides is still the same.
  5. TomG

    TomG New Member

    Joined:
    Dec 10, 2010
    Messages:
    4
    Loc:
    SE Pennsylvania
    Thank you very much for your help! Have a happy New Year.

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