[RE-wrenches] Expansion on conduits on commercial roof tops!

[Hans Frederickson]

You just need to keep your strut straps loose enough that the conduit will
slip as it expands and contracts. Sometimes you'll need to use the next size
bigger strap from the conduit you're using. Then make sure you strap the
barrel of the expansion coupling tight, and remember to leave enough slack
wire in your boxes and conduit bodies to allow for conduit expansion to pull
on the wire a bit without stressing wire terminations. That's it. The Carlon
guide for installing their PVC parts covers this stuff pretty well:

http://www.carlon.com/Installation_Training/IT-ISEXPJT.pdf

 

Regards,

-Hans

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of James
Rudolph
Sent: Friday, December 23, 2011 5:53 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Expansion on conduits on commercial roof tops!

 

Thanks fellas,
I guess I was not clear. We are using RMC or IMC on all of are roof top runs
with the appropriate expansion fittings. I am trying to figure out how to
deal with the movement of the conduits at the bases where we strap it down
to the base( a curb with a small peice of shallow b-line placed on it (4')
).

On Thu, Dec 22, 2011 at 12:06 PM, Jason Szumlanski <Jason at fafcosolar.com>
wrote:

PVC conduit? Search for "Carlon PVC Expansion Fittings."

 

They publish a good PDF that shows when expansion fittings are required and
how to install them properly.

 

Jason Szumlanski

Fafco Solar

 

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of James
Rudolph
Sent: Thursday, December 22, 2011 9:39 AM
To: RE-wrenches
Subject: [RE-wrenches] Expansion on conduits on commercial roof tops!

 

Howdy Wrenches,

I was wondering how everybody is dealing with expanding conduits on roof
tops? Do we have an accepted best practice on this?. What I am really
looking for is a way to starp long conduit runs on commercial rooftops in
direct sun that allow movement and expanision joints to do thier job.

Mahalo in advance!



James B Rudolph
NABCEP Certified PV Installer 


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-- 
James B Rudolph
NABCEP Certified PV Installer



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