trapeze calcs

[jusme123]

have 16 rgs conduits with 4- 500 mcm in each. the racks have to be 8 on bottom and 8 on top rack. what size strut and rod, and spacing between each rack?

 

[cadpoint]

What are You going to to attach this all to? You didn't say horizontal or vertical, and the NEC Code varies.

Horizontal:
I'm thinking 1/2" rod and deep strut back to back, I'm going to guess one rack per a section of conduit. With a minimum of 2 additional nuts and bolts w/ washers everywhere per rack....

What are You thinking?

 

[Volta]

have 16 rgs conduits with 4- 500 mcm in each. the racks have to be 8 on bottom and 8 on top rack. what size strut and rod, and spacing between each rack?

What size rigid? Four 500 kcms will fit in 3".
3" ~ 7.1 lb/ft
3-1/2" ~ 8.55 lb/ft
4" ~ 10 lb/ft

500kcm ~ 1.543 lb/ft x 4 ~ 6.172 lb/ft

6.172 + 10 = 16.2 lb / ft each

16.2 x 16 = 260 lb /ft for the set of 16 if in 4"

Allowed up to 20' between supports, but . . . :roll:

I'd suggest you figure your pipe size before you bother with further calcs. Don't overlook the pulling tension and a safety factor.

 

[jusme123]

What are You going to to attach this all to? You didn't say horizontal or vertical, and the NEC Code varies.

Horizontal:
I'm thinking 1/2" rod and deep strut back to back, I'm going to guess one rack per a section of conduit. With a minimum of 2 additional nuts and bolts w/ washers everywhere per rack....

What are You thinking?

4" rgs looking for calc breakdown. concrete ceiling using drop-ins (hilti)

 

[tkb]

Did you even try to calculate this, or do you want someone else to do the work for you?