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#75484 - 02/27/07 07:39 PM stell bar joist  
sudsy4  Offline
Member
Joined: Apr 2002
Posts: 32
Elizabeth,PA USA
Does anyone know of any requirements as to where or where not to attach conduit to steel bar joists?


Bill

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#75485 - 02/27/07 09:27 PM Re: stell bar joist  
Peter  Offline
Member
Joined: Jun 2004
Posts: 92
San Diego
It might be a specification issue. I have been on jobs that seemed to say "Do not install conduit on top of the bottom bars." But I have no idea why.
On other jobs, anything goes.
However, if you are running conduit parallel to the joist, it is wise to run them along side instead of on the bottom. The reason being that sometime later, someone may have to run another conduit perpendicular to the bar joists along the bottom and the bottom should be clear for this.
Also it is inadvisable to run conduit above the joists in the roof corrugation since it would be vulnerable to damage by the roofer's long screws.
~Peter


#75486 - 02/28/07 12:43 AM Re: stell bar joist  
stevecheyenne  Offline
Member
Joined: Nov 2006
Posts: 38
Yorba Linda, CA
It does seem to vary by job, but if it's a hassle you can generally get the requirement to stay off of the lower bar waived. Just ask the owner if he wants you to testify as part of the lawsuit - the lawsuit against the structural engineer who designed a roof so flimsy it couldn't stand the additional load of a conduit, much less a replacement roof.

It's amazing how much stronger those joists get when you do that.


#75487 - 02/28/07 09:03 AM Re: stell bar joist  
Luketrician  Offline
Member
Joined: Jul 2006
Posts: 272
Sale Creek, TN USA
Few years ago, I was running some 3/4 homerun conduits and the GC told me that I needed to run all of my conduits as close as possible to the weld points of the bar joists. I told him that may be true for hanging transformers, bussduct or other types of heavy equipment, but not for EMT.


Luke Clarke
Electrical Planner for TVA.


#75488 - 02/28/07 08:29 PM Re: stell bar joist  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
It is a common job specification for us not to use the bottom cord for support.

Always read your specs. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#75489 - 02/28/07 10:02 PM Re: stell bar joist  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I have not run into the "don't use" spec ... but, thanks to this forum, I'll add it to my list of things to be careful about!

FWIW. I do try to avoid running screws into such things; I use beam clamps instead.

Thx, Iwire!



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