[RE-wrenches] Aluminum conduit LBs

[Drake Chamberlin]

Rather than use 3" pipe for the run, you could 
use reducing bushings in a 3" LB and use it with a 2 1/2" conduit.


At 12:47 PM 8/14/2010, you wrote:

>The lesson was that even if, say, for a 2 ½ “ 
>conduit says three 350 MCMs are OK, that doesn’t 
>mean that a 2 ½” LB I was planning on using is rated for three 350s.
>
>For the first time ever I saw printed in the LB 
>itself the specified max conduct size, in this case 4/0 for a 2 ½” LB.
>
>So for this short conduit run I upsized everything to 3”.
>
>I looked at the Thomas and Betts spec sheet 
>kindly supplied by Ratico on their LB offerings 
>and there was no notation of max conductor sizes that I could find.
>
>marco
>
>Marco,
>I'm curious to know what you did after the 
>"hard" lesson. Was it an issue of 
>difficult/impossible installation, or an AHJ 
>issue? It seems like the most straightforward 
>solution in a situation like this is to replace 
>your conduit bodies (LBs in this case) with a 
>larger size, and then install reducers in order 
>to leave the existing conduit runs intact. I'm 
>looking at an upcoming installation where I 
>would like to use 1-1/4" EMT, but will need 
>1-1/2" conduit bodies to be ok with wire fill.
>
>-Hans
>
>
>----------
>From: re-wrenches-bounces at lists.re-wrenches.org 
>[mailto:re-wrenches-bounces at lists.re-wrenches.org] 
>On Behalf Of Marco Mangelsdorf
>Sent: Thursday, August 12, 2010 8:19 PM
>To: 'RE-wrenches'
>Subject: [RE-wrenches] Aluminum conduit LBs
>Anyone know where I could go to find out the max 
>conductor sizes that threaded Al. LBs can handle?
>
>I learned the hard way that a conduit of X 
>inches that can handle conductors of a certain 
>size does not necessarily mean that a LB of the 
>same diameter can handle the same size conductors.
>
>Thanks,
>marco
>
>
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Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM  Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648  
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