Steel EMT:
1 1/2" EMT 11.6 lbs for 10'
2" EMT: 14.8 lbs for 10'
http://www.alliedtube.com/electrical-raceways/conduit/electrical-metal-tubing.asp Or you could use AL:
http://www.alliedtube.com/electrical-raceways/conduit/aluminum-grc-emt.asp Steel strut:
Back to back 1 5/8 strut max load for 3' span 3,130 lbs
3.78 lbs for 1 piece of above strut 1' long
1 1/2 Steel EMT 5.8 lbs for 5' x 5 runs = 29 lbs
2" Steel EMT: 7.4 lbs for 5' x 5 runs = 37 lbs
Strut 1 5/8 x 3' x 2 runs = 23 lbs
Total Steel 89 lbs for 5' of above
Here is the copper wire. I can't say if it is the right wire or accurate but I'll try the numbers.
http://www.allaboutcircuits.com/vol_5/chpt_3/1.html 15 #2 x 5'= 75' #2
15 3/0 x 5'= 75' 3/0
I figured 0.2 lbs /foot is #2 x 75'= 15 lbs
and 3/0 is 0.5 lbs / foot X 75'= 37.5 lbs
Total conductor weight is 52.5 lbs for 5'
Combined weight is 141.5 lbs for 5'
devide that by 2 threaded rods =71 lbs
Threaded rod specs:
http://www.alliedtube.com/electrical-raceways/strut-channel/powerstrut.asp 1/4 threaded rod is rated for 240 lbs (3.4 times your load)
3/8 rod is rated at 610 lbs (8.6) times your load)
1/2 rod is 1,330 (18.8 times your load)
Keep in mind not all threaded rod my be to this spec. I would go with the 3/8 for more strength in side to side movement. Where a 1/4 should handle a strait down load it could fail under load when twisted or pushed sideways.
I didn't figure in hardware or fittings but it would not change much. Disclaimer :I'm not an engineer, just doing it as a puzzel.
You could also reduce some of your pipes to 1 1/4.
Tom
