<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span>Hi all when I started electrical work early 1950s I was taught that any long run on roof had to have a 90 degree bend in it and the wire had to have free space in the box to move in and out of a box. I do not know if it is valid but I was taught that the short leg of the run should be about 10% of the length of the long stright side. I love metal conduit, I do not like plastic, but you might say i am old school.</span></div><div><span>DT</span></div><div><br></div> <div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <font size="2" face="Arial"> <div style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); height: 0px; line-height: 0; font-size: 0px;" class="hr" contentEditable="false"
readonly="true"></div> <b><span style="font-weight: bold;">From:</span></b> Hans Frederickson <hans@fredelectric.com><br> <b><span style="font-weight: bold;">To:</span></b> 'RE-wrenches' <re-wrenches@lists.re-wrenches.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, December 23, 2011 11:31 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Expansion on conduits on commercial roof tops!<br> </font> <br>
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--></style><div><div class="yiv928372586WordSection1"><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>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:</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>http://www.carlon.com/Installation_Training/IT-ISEXPJT.pdf</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73,
125); font-family: "sans-serif"; font-size: 11pt;'> </span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>Regards,</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>-Hans</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'> </span></div><div class="yiv928372586MsoNormal"><b><span style='font-family: "sans-serif"; font-size: 10pt;'>From:</span></b><span style='font-family: "sans-serif"; font-size: 10pt;'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>James Rudolph<br><b>Sent:</b> Friday, December 23, 2011 5:53 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Expansion on conduits on commercial roof tops!</span></div><div
class="yiv928372586MsoNormal"> </div><div style="margin-bottom: 12pt;" class="yiv928372586MsoNormal">Thanks fellas,<br>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') ).</div><div><div class="yiv928372586MsoNormal">On Thu, Dec 22, 2011 at 12:06 PM, Jason Szumlanski <<a href="mailto:Jason@fafcosolar.com" rel="nofollow" target="_blank" ymailto="mailto:Jason@fafcosolar.com">Jason@fafcosolar.com</a>> wrote:</div><div><div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>PVC conduit? Search for “Carlon PVC Expansion Fittings.”</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family:
"sans-serif"; font-size: 11pt;'> </span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>They publish a good PDF that shows when expansion fittings are required and how to install them properly.</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'> </span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif";'>Jason Szumlanski</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'>Fafco Solar</span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size: 11pt;'> </span></div><div class="yiv928372586MsoNormal"><span style='color: rgb(31, 73, 125); font-family: "sans-serif"; font-size:
11pt;'> </span></div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0in 0in;"><div class="yiv928372586MsoNormal"><b><span style='font-family: "sans-serif"; font-size: 10pt;'>From:</span></b><span style='font-family: "sans-serif"; font-size: 10pt;'> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" rel="nofollow" target="_blank" ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" rel="nofollow" target="_blank" ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>James Rudolph<br><b>Sent:</b> Thursday, December 22, 2011 9:39 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] Expansion on conduits on commercial roof
tops!</span></div></div><div><div><div class="yiv928372586MsoNormal"> </div><div style="margin-bottom: 12pt;" class="yiv928372586MsoNormal">Howdy Wrenches,<br><br>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.<br><br>Mahalo in advance!<br><br clear="all"><br><br><b>James B Rudolph<br>NABCEP Certified PV Installer </b></div></div></div></div></div><div style="margin-bottom: 12pt;" class="yiv928372586MsoNormal"><br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" rel="nofollow" target="_blank" ymailto="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options &
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