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Ampacity Rating of ACSR and AAC versus Copper

Ampacity Rating of ACSR and AAC versus Copper

Ampacity Rating of ACSR and AAC versus Copper

(OP)
Most bare copper conductors (used in a substation) are rated with an ambient temperature of 40 Deg C and temp rises of 30, 40 and 50 Deg C. All the ACSR and AAC tables I've seen (like Southwire) rate them at 25 Deg C ambient and only a 50 Deg C rise. Why don't the two worlds match their rating basis? How can you get an accurate ACSR or AAC rating at 30 and 40 Deg C rise above 40 Deg C ambient?

Thanks

RE: Ampacity Rating of ACSR and AAC versus Copper

There are some manufacturers' catalogues indicating ampacity for AAC and ACSR for 40 oC ambient air. For instance:
In “Aluminum Electrical Conductor Handbook” 3rd Edition published by Aluminum Association, Washington, D. C., 1989
http://www.amazon.com/Aluminum-Electrical-Conducto...
Section II Bare Aluminum Wire and Cable presents a table [Table 3-13] for different cables in 40 oC ambient, no sun and still air or 2ft/sec wind.
You can follow IEEE 738/2006 calculation way also taking into consideration sun exposure and wind. In annex B you'll find even a Basic written program.

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