user dauwerda 1

[chuckd83]

I'm sorry, I can't seem to find a way to private message someone and the thread they posted on is closed.

dauwerda,

You posted a spreadsheet calculator on the below thread for the deratings of bundled conductors. I extracted the equations from the spreadsheet, but can't seem to find them in the cited IEEE 738 standard.

https://www.eng-tips.com/viewthread.cfm?qid=462246

 

[dauwerda]

chuckd83, the "normal" ratings of the conductors are determined from IEEE 738.
The derating due to the proximity effect is put together based on the following sources (links take you to the document on IEEE website):
Skin Effect and Proximity Effect in Tubular Conductors
Skin Effect in Tubular and Flat Conductors
Bessel Functions for A-C Problems

Here is the general outline of how the calculations in the spreadsheet are set up:

 

[chuckd83]

Thanks. Those are the equations I extracted. I took it from your post back in January that they were taken from IEEE 738. Thanks for the sources.