[RE-wrenches] Aluminum conduit LBs

[Marco Mangelsdorf]

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

 

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20100814/7f25746e/attachment-0003.html>