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 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
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
