Greg, sorry to upset you. The loads I'm talking about are not debateable. I cannot change the loads. They are fixed pieces of machinery, with motor loads and fixed amperage.
The machines are 3 phase, and are in a pretty big building. Under the circumstances, it is not fesible to pull a conduit to each piece of machinery from the panel, therefore I am pulling 3 circuits through the appropriate conduit size. That gives me 9 current carrying conductors, which the code says I have to derate to 70%. After derating these conductors, some of the original conductor sizes will not work. I understand what you are talking about, when the load can be regulated; lights, recpts. etc., but in my case, I have no option.
As far as # 14 not being used for anything except 15 amps, you need to look at the previous post about that particular question. I'll not take the time to re run all of that.
Now, if I'm still missing something please let me know ... Steve.....
[This message has been edited by sparkync (edited 03-15-2005).]