Appendix 4 Temperature Correction (TC) Function
A5
Appendix
Reference_____________________________________________________
Conductive Properties of Metals and Alloys
Copper Wire Conductivity
The temperature coefficient changes according to temperature and conductivity If the tem-
perature coefficient at 20
°C is
α
20
and the temperature coefficient for conductivity C at t°C is
α
ct
,
α
ct
is determined as follows near ambient temperature.
For example, the temperature coefficient of international standard annealed copper is 3930
ppm/°C at 20°C. For tinned annealed copper wire (with diameter from 0.10 to less than 0.26
mm), the temperature coefficient
α
20
at 20°C is calculated as follows:
Reference documentation: Handbook for Electronics, Information and Communication
Engineers, Volume 1, published by the Institute of Electronics, Information and Communi-
cation Engineers
Material Content [%]
Density (x10
3
)
[ kg/m
3
]
Conductivity
Temp. Coeff.
(20°C) [ppm/°C]
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
α
Ct
=
1
+ (
t − 20)
1
α
20
× C
≈ 3650 ppm/°C
α
20
=
1
+ (20 − 20)
1
0.00393 × 0.93
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