Results 1 to 3 of 3

Thread: Is PVC ok for micro inverter system?

  1. #1
    Join Date
    Mar 2016
    Location
    Washington State
    Posts
    18

    Is PVC ok for micro inverter system?

    Hello,

    We've been installing SunPower ACPV modules a lot lately. My assumption would be that I do not have to run EMT to the first point of disconnect with these systems as I had to in the past with DC coming off the roof. I could use PVC or other methods?

    Is that assumption correct?

    thanks!

  2. #2
    Join Date
    May 2011
    Posts
    3,548
    I think it is considered bad practice in the industry to use PVC on rooftops, at least if installed close to the roof. This may be because some PVC is not rated for the temperature and sunlight and people have had bad experiences. I would make sure your PVC is sunlight resistant and is rated for above 50C or that could be a code violation. (See 352.12(D)). Remember that the roof surface can be much hotter than the general ambient temperature, something recognized by 310.15(B)(3)(c).

    Otherwise, yes, no issues, except by local amendment, especially if inside. And for what it's worth, the requirements for DC haven't been different except inside a building.

  3. #3
    Join Date
    Mar 2016
    Location
    Washington State
    Posts
    18
    Quote Originally Posted by jaggedben View Post
    I think it is considered bad practice in the industry to use PVC on rooftops, at least if installed close to the roof. This may be because some PVC is not rated for the temperature and sunlight and people have had bad experiences. I would make sure your PVC is sunlight resistant and is rated for above 50C or that could be a code violation. (See 352.12(D)). Remember that the roof surface can be much hotter than the general ambient temperature, something recognized by 310.15(B)(3)(c).

    Otherwise, yes, no issues, except by local amendment, especially if inside. And for what it's worth, the requirements for DC haven't been different except inside a building.

    thanks. Yeah I wouldn't use it on a roof, more talking about in a wall.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •