The lesson was that even if, say, for a 2 ½ conduit says three 350 MCMs are OK, that doesnt 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-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3067 - Release Date: 08/12/10 08:34:00
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