hi,

assuming (1) you know the current carrying capacity of a wire at room
temperature and (2) the resistance of the wire at room temperature (25 deg
c), and assuming that the current carrying capacity of the wire is inversely
proportional to its resistance, you can derive the current carrying capacity
of the wire at any temperature by using the temperature coefficient of
resistance for copper shown as follows:

Rt=R25(1+0.00385(t-25) where
Rt is the resistance at temperature t in deg C
R25 is the resistance at 25 deg C
and t is the wire temp in deg C

From Lange's Handbook of Chemistry, 8th Edition

ciao

-----Original Message-----
From: Barbara Burcham [mailto:[log in to unmask]]
Sent: Tuesday, January 18, 2000 8:04 AM
To: [log in to unmask]
Subject: [TN] Current carrying capacity of...


I am looking for a calculator or chart that will show the Current carrying
capacity of copper at temperatures below freezing. Specifically, -10 C.
Can anyone direct me?

Barbara J. Burcham, CID
PCB Designer
Fairfield Industries
Sugar Land, TX 77478
281-275-7687 Work
281-275-7550 Fax
[log in to unmask]

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