Cable tray Support - Threaded rod - Calculations

[NickParker]

How to do the load calculation for cable ladder threaded rod support to confirm that 10mm diameter threaded rod suitable to carry the total load of cable ladder plus cable weight. I have the inputs of ladder weight and cable weight.
What is the equation to be followed?

 

[7anoter4]

At first, I think, you have to calculate the cable tray load[of cables], to state the type of tray: metallic [steel, aluminum],fiberglass and other ,the standard type-for instance according to NEMA VE-1 or IEC 61537 or else, including a safety factor[may be 1.5 for instance]. Sometime a concentrated load -as a standing man weight- may be taken into consideration. A cable tray manufacturer has to provide the cable tray parts data as width, height, weight.
Then, according to cable tray support configuration, a structural engineer may calculate the actual load on each support rod and according to rod material: steel, fiberglass or else to state the right diameter.
See-for instance :

http://forums.mikeholt.com/showthread.php?t=177637