Based on the
resistance-temperature
coefficient of copper of 100 percent
conductivity and of aluminum 61 per-
cent conductivity (international an-
nealed copper standard) at 25°C and
the formulas:
R1 = Resistance at 25°C
R2 = Resistance at desired temp.
T2
T1 = 25°C |
Copper
R2
= R1 |
 |
Example:
R dc at 75°C for 4/0 AWG
uncoated copper = 0.0509x
1.193 = .0607 ohms/1000ft.
|