Aircraft cable vs. Threaded Rod

[stevebea]

Have any the forum members ever built a trapeze for conduit runs suspended by aircraft cable? Would you consider this to be " securely fastened " ? I would like to hear some of your thoughts. Thanks.

 

[chris kennedy]

I wouldn't consider that for securing, athough I would say its fine for supporting.

 

[earlejohnson]

Have any the forum members ever built a trapeze for conduit runs suspended by aircraft cable? Would you consider this to be " securely fastened " ? I would like to hear some of your thoughts. Thanks.

What is aircraft cable got a pic. Thanks

 

[Eric R 1973]

I personally would use threaded rod and uni-strut for the trapeze. The cable might be alright for sizemic (probably misspelled that) bracing

 

[btharmy]

We commonly use gripple to hang f-bays and to satisfy secondary support requirements of fixtures mounted in suspended ceilings. I have even seen them used to hang a 45kva transformer in a warehouse.

Check this out.
http://www.gripple.com/about-us/article/trapeze-award.html

 

[jdsmith]

Have any the forum members ever built a trapeze for conduit runs suspended by aircraft cable? Would you consider this to be " securely fastened " ? I would like to hear some of your thoughts. Thanks.

As an owner's engineer I would never allow this in my plant. We require trapezes to use a minimum of 1/2" diameter allthread, and even 1/2" allthread supporting aluminum cable tray with a 7" side rail is fairly flexible after everything is made up tightly. We design new installations with structural steel supports and try to minimize the use of any trapezes, but clearly they are required in a lot of retrofit applications.

All of that being said, I believe that a unistrut trapeze supported by aircraft cable or wire rope would meet the requirements for securing conduit assuming all components are properly sized for the loads. The technical difference is that allthread can be loaded in tension or compression, while aircraft cable can only be loaded in tension. Neither aircraft cable nor allthread provides much lateral stiffness, althrough cable provides less stiffness than allthread. With either support method the conduit or cable tray is what ties multiple trapezes together and stabilizes the support system.

 

[iwire]

Neither aircraft cable nor allthread provides much lateral stiffness, althrough cable provides less stiffness than allthread. With either support method the conduit or cable tray is what ties multiple trapezes together and stabilizes the support system.

I think that is the key right there.

 

[stevebea]

What is aircraft cable got a pic. Thanks

I couldnt upload a pic but you can Google aircraft cable or wire rope.

 

[earlejohnson]

I couldnt upload a pic but you can Google aircraft cable or wire rope.

Oh I know what it is now just never heard the term aircraft cable before.