I deal with New Mexico/ Colorado/ Texas for my inland experience, and
Hawaii/ Mexico for my coastal experience.
Hawaii is hard core enough that many main service boxes are Stainless.
New Mexico requires the wet loc fittings for EMT with the integrated
plastic seals. We use our old stock of regular compression fittings
indoors now.
I want to try the Polyetheylene conduit system, but I've never
actually seen it used. It is listed in the NEC though, and has a much
lower coefficient of expansion.
I don't know how it will perform relative to UV, though. The black PE
plumbing pipe I've used holds up very well to UV, just never tried the
electrical version.
I'm not even sure what fittings you would use with it.
Anybody have experience?
R. Walters
r...@solarray.com
Solar Engineer
On Oct 10, 2009, at 10:33 AM, August Goers wrote:
Hi Ray –
What coastal region or regions are you familiar with? I’m really
only familiar with the San Francisco Bay Area but thoroughly painted
EMT seems to hold up through the long haul even just a few blocks
from the ocean. If it isn’t painted the straps and fittings start
rusting in less than a year. I imagine that warmer and more tropical
coastal regions would indeed rot EMT out in no time.
As a separate note, San Francisco now requires the use of fittings
listed for use in wet locations. These “wet loc” fittings we’ve been
using for the last few years seem to hold up quite well.
-August
From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-
boun...@lists.re-wrenches.org] On Behalf Of R Ray Walters
Sent: Friday, October 09, 2009 4:22 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Rooftop wiring methods between multiple
subarrays
EMT needs to be "pickled" with vinegar or acid, to get the paint to
hold. I love it for inland work, but near the ocean, it'll rust
through in 5 years. I'm not sure how much more time paint would buy
you.
Anybody use other plastic materials HDPE? Supposed to not have the
expansion problems of PVC.
R. Walters
r...@solarray.com
Solar Engineer
If you have to run around the roof with EMT, you can protect it from
rust
with a coat of paint.
Regards,
-Hans
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
