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Overhead Lines

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chadwiseman

Electrical
Aug 20, 2003
32
I am in the process of reruiting a number of 4160 distribution lines. I am finding it difficult to locate the current rating of various ACSR conductors. If someone could point me in the right direction it would be appreciated. Also, what is the usual acceptable temperature rise in overhead lines, and where could one find a set of tables with various ampacity vs maximum temperature?
 
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See the enclose site from SKM republishing the table from the Westinghouse T&D Book.
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Thanks for the tables. Is there any recommendation as to weither to use 75C or 90C, and either simple conversion to change from one rating to another?

 
Ranger
One thing to consider is that at the 90C rating, you will have greater sag in the conductor so you need to design that in to you job.
 
Infrared thermography is commonly used for this application but is not especially accurate. There may be some good uses in diagnostics, maybe more for connections than the conductor itself.
 
The maximum temperature is generally limited by sag and clearance considerations. Many utilities use 75 deg C because this is what the Westinghouse T&D Handbook uses and was the basis for NESC basic clearances. The annealing temperature of ACSR is much higher, however, so you can use higher temperatures if you account for it in providing clearances.
 
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