GENERAL TECHNICAL INFORMATION

GENERAL TECHNICAL INFORMATION

CORRELATIONS
Proportions of aluminium and copper under identical conditions of resistance:

TEMPERATURE DEPENDENCE OF RESISTANCE
If resistance RT is measured at a temperature T ≠ 20 oC, then resistance R20 can be calculated as follows:

Dimension:  Al = 1.27  Cu Area: AAl = 1.63 ACu Weight: mAl = 0.50 mCu
COPPER
Quality standard:
Resistivity (ρCu):
Specific heat (cpCu):
Temperature coefficient of resistance (αCu): Coefficient of longitudinal expansion (a ):

RT1 + α (T – 20)
where:
T = the actual temperature in oC at the time of
measurementα = the temperature coefficient (see the sections
above on copper and aluminium)
The temperature coefficients above only apply within the range 15 ≥ T≥ 25 (oC).

R20 =

   

Cu

ASTM B 49; EN1977 ETP/ETP1
0.01709 Ωmm2/m 0.368 J/(g K) 3.93 ‰
18.5 .10-6/K
8.96 g/cm3370 – 400 W/(m K)
EN 573-3 (EAI 99.7) 0.02789 Ωmm2/m 0.207 J/(g K)
4.30 ‰
23.8 .10-6/K 2.70 g/cm3 200 W/(m K)

Specific gravity:
Thermal conductivity (λCu):
ALUMINIUM

Quality standard:
Resistivity (ρAl):
Specific heat (cpAl):
Temperature coefficient of resistance (αAl):
Coefficient of longitudinal expansion (a ): Al
Specific gravity:
Thermal conductivity (λAl):