[RE-wrenches] Aluminum conduit LBs

[Darren Emmons]

Drake Chamberlin <drake.chamberlin at redwoodalliance.org> wrote:

>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
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