[RE-wrenches] PVC
William Miller
william at millersolar.com
Fri Oct 9 13:37:22 PDT 2009
August:
As discussed, PVC is sometimes the best solution in a corrosive
environment. I would never recommend supporting PVC as depicted in the
photos. Shooting a screw through comp roofing is questionable at
best. Better methods of installing PVC are available, including better
straps and painting for UV protection.
I might add that although I would not tolerate brown PVC, UV browning does
not render the conduit unusable. The browning is only a few microns
thick. This is why the conduit says "UV resistant".
For hangers, I suggest a better anchoring system. We use aluminum strut
with stainless fasteners and hangers. From our previous life as a tower
rigging firm we have brought over stainless telecommunications
hardware:
http://awapps.commscope.com/catalog/andrew/product_details.aspx?id=13158
This is available in various sizes
William Miller
At 11:26 AM 10/9/2009, you wrote:
>Content-Language: en-US
>Content-Type: multipart/related;
>
>boundary="_004_29A77A075EE0674CB6040A8B3B716734AAC371AAMBX04exg5exghos_";
> type="multipart/alternative"
>
>All
>
>PVC doesnt hold up well in the Bay Area Heres a photo of some ~4 year
>old PVC browned PVC from Marin County:
>
>83877e5.jpg
>
>
>You can see that the straps melted resulting in the conduit sliding down.
>Thank goodness we didnt install this. PCV seems like a good option for
>shaded areas.
>
>As Bill pointed out, if we use EMT we need to bond both ends of the
>conduit to comply with NEC 250.97. My issue is that it is hard to find
>outdoor rated bonding bushings thats why weve just been installing
>cast metal boxes with threaded connections (complies with NEC 250.92(B)(2)).
>
>As William point out, EMT is robust and reliable. I still think that there
>must be more efficient way to go between arrays. Maybe thats why
>commercial low profile racking systems are often fully integrated systems
>with built in wire raceways.
>
>-August
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20091009/dfacaa3d/attachment-0004.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 83877e5.jpg
Type: application/octet-stream
Size: 12266 bytes
Desc: not available
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20091009/dfacaa3d/attachment-0007.obj>
More information about the RE-wrenches
mailing list