Appendix9 Temperature Correction Function (TC)
A14
Reference
Conductive Properties of Metals and Alloys
Copper Wire Conductivity
The temperature coefficient changes according to temperature and conductivity, so if the temperature coeffi-
cient at 20C is
20
and the temperature coefficient for conductivity C at t C is
ct
,
ct
is determined as fol-
lows near ambient temperature.
For example, the temperature coefficient of international standard annealed copper is 3930 ppm @20C. For
tinned annealed copper wire (with diameter from 0.10 to less than 0.26 mm), the temperature coefficient
20
at 20C is calculated as follows:
Material Content [%]
Density (x10
3
)
[kg/m
3
]
Conductivity [%]
Temp. Coeff.
(20°C) [ppm]
Annealed copper wire Cu>99.9 8.89 1.00 to 1.02 3810 to 3970
Hard-drawn copper wire Cu>99.9 8.89 0.96 to 0.98 3770 to 3850
Cadmium copper wire Cd 0.7 to 1.2 8.94 0.85 to 0.88 3340 to 3460
Silver copper Ag 0.03 to 0.1 8.89 0.96 to 0.98 3930
Chrome copper Cr 0.4 to 0.8 8.89
0.40 to 0.50
0.80 to 0.85
2000
3000
Carlson alloy wire
Ni 2.5 to 4.0
Si 0.5 to 1.0
0.25 to 0.45 980 to 1770
Annealed aluminum wire Al>99.5 2.7 0.63 to 0.64 4200
Hard-drawn aluminum wire Al>99.5 2.7 0.60 to 0.62 4000
Aldrey wire
Si 0.4 to 0.6
Mg 0.4 to 0.5
Al remaining portion
0.50 to 0.55 3600
Diameter [mm] Annealed copper wire Tinned annealed copper wire Hard-drawn copper wire
0.01 to less than 0.26 0.98 0.93 -
0.26 to less than 0.29 0.98 0.94 -
0.29 to less than 0.50 0.993 0.94 -
0.50 to less than 2.00 1.00 0.96 0.96
2.00 to less than 8.00 1.00 0.97 0.97
ct
1
1
20
C
------------------- t20–+
--------------------------------------------=
20
1
1
0.00393 0.93
------------------------------------ 20 20–+
-----------------------------------------------------------------=
3650 ppm
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