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Old 03-25-2011, 11:20 AM   #1
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Weatherhead for photovoltaic system

A solar contractor will soon be installing a photovoltaic system on the roof of my attached garage. Instead of running the conduit and wires over the edge of the roof and down the side of the house before entering the the basement, I proposed installing a weatherhead and getting the wires and conduit inside as quickly as possible. My question is, is there such a thing as a weatherhead which accommodates twelve #10 THHN wires? Also, is there a minimum height for such a weatherhead above the surrounding roof? Thanks. Bill


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Old 03-25-2011, 12:27 PM   #2
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They do make such an animal but you will need to go to an electrical supply store. I doubt if the big box stores would carry it.


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Old 03-25-2011, 05:38 PM   #3
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What you need is a roof jack and a box, not a weatherhead. A weatherhead is specifically for individual conductors, and THHN cannot be left exposed. Your conductors will be in conduit. So, you run a conduit up through the roof using a roof jack (a flashed penetration for a pipe or conduit, which you would have with a weatherhead anyways), and mount a good sized box on top for the conduit to run into instead of a weatherhead. That way the conductors are not exposed to the weather.
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Old 03-25-2011, 06:24 PM   #4
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and how do you propose that he support that box on top of a stick of pipe???

How about flex(liquidtight) and a connector to the solid pipe coming out the roof jack?
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Please follow the code - its there for your safety no matter how inconvenient.

Last edited by Saturday Cowboy; 03-25-2011 at 06:27 PM.
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