I think that's why no one came back to me because I didn't really give very many details. So here's what I'm dealing with and this is what I've found:
1. Multi conductor cable ±1.25" diameter.
2. Less than 2k volts.
3. Tray is ladder type 18" wide, uncovered.
4. SER cable Listed TC.
The question is- How many cables can I put in the tray and do I have to derate them in 86° ambient?
I came up with 16 cables and since it's a ladder type tray no spacing is required nor is there any derating applicable.
Edited for spelling.
[This message has been edited by George Little (edited 04-21-2006).]