[RE-wrenches] Aluminum conduit LBs

[Keith Cronin]

You might consider using a gutter in lieu of the LB or a junction box if the 
site conditions are conducive.



________________________________
From: Marco Mangelsdorf <marco at pvthawaii.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Sat, August 14, 2010 6:47:37 AM
Subject: [RE-wrenches] Aluminum conduit LBs

 
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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