Load Factor and Cable Loading

[3winding]

How is load factor calculated in the IEEE tables?

 

[7anoter4]

I think the calculation method is well explained in Ch.2- "References " and Ch.3-"Technical feature of the tables" namely Sub.ch. 3.5 "Method of calculation". Also in Appendix A are described some examples.
These ampacities were calculated as detailed in the basic ampacity paper, AIEE Paper 57-660, "The Calculation of the Temperature Rise and Load Capability of Cable Systems, by J. H. Neher and M. H. McGrath". See:

http://www.scribd.com/doc/22383861/...Capability-of-Cable-Systems-Neher-and-McGrath

I'd prefer IEC 60287 [for metric u/m].It is less sophisticated. My opinion.