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I would like to mount a floodlight on my chimney. I'm not keen on cutting into the roof there to make an entrance for the wire. Every hole in the roof is an opportunity for water intrusion and it's also above a vaulted ceiling - access is difficult and there is nothing to tie into there.

Would it be ok to let the power cord lay on the roof and run around the eaves, perhaps to a high mounted in-use box? It doesn't seem great - don't anyone tripping or slipping on the cord.

I'd like to hear your thoughts on this.

  • Uh, why isn't the box for the floodlight mounted on the chimney? – ThreePhaseEel Oct 20 at 5:42
  • Hello, and welcome to Home Improvement. What material would this power cord be made of? And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Oct 20 at 12:41
  • Is this 12/24 volt lighting? (Why not?) – Harper - Reinstate Monica Oct 20 at 12:49
  • Thank you for your replies. It would be 120 volt. I have a big 300W LED light that produces a sea of light. The cord would just be unshielded three conductor double insulated, similar to an extension cord. This is what comes out of the floodlight and I can make a waterproof splice into that. I was thinking of mounting the outlet box on a wall underneath the eaves, but I suppose an alternative would be to have shielded wire or conduit going up on the roof and having a box on the chimney. – Michiel Oct 20 at 15:06
  • @Michiel where are you on this planet? Where did you get this fixture, by the way? – ThreePhaseEel Oct 21 at 3:27
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I think your plan is not pretty but for sure would work. You are right every hole is a potential leak but an electrical box mounted on asphalt shingles are a reasonably low risk because sealing them is pretty simple and durable. Therefore I would go with the box.

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Although it is fine to secure your light / fixture box to your chimney, it is not OK to put a 120vac power cord loose-lay on your roof in order to avoid risk of leaks. Power must be properly protected and secured. Your municipality's building inspection office could be a great source of advice about conduit or fastening requirements appropriate for your application if you draw up a schematic with dimensions and explain what you are trying to achieve.

  • Thanks, Geoff. It confirms what I was already thinking. I think I'm going to pass on this. – Michiel Oct 21 at 3:26
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Just to bolster your decision, assuming (from the 120V reference) that you are in North America somewhere, it is illegal to use portable cord for permanent installations. So that right there killed the idea. From a technical standpoint, rubber portable cord, which would be water resistant enough for this, would break down and deteriorate in direct sun exposure.

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