sizing of a cable tray

[acid75070]

I am doing some work out of town and I am not understanding how to size a cable tray for the following feeders.
3-3/0 and # 4 gnd I have four sets of these conductors
3-2/0 and # 4 gnd I have six sets of these conductors
3-1/0 and # 6 gnd I have three sets of these conductors
And it is in a industrial plant with supervision and can the wire be Thhn.
They want it in a alum. open ladder cable tray.


Think you
Lost

 

[qcroanoke]

If they have Cooper B-line cable tray try this link.
It may help you.

http://www.b-line.com/engineer/index.asp

 

[gwpowell]

NEC Section 392 provides a good explanation of the many variables associated with the sizing of cable tray. I have used B-Line & PW Industries as suppliers in the past, their websites provide some good technical information (www.pwindustries.com & www.b-line.com).