Page 969 - Industrial Power Engineering and Applications Handbook

Parameter.5 Standard copper Commercial purity aluminium (for electricul use)
(IACS)a
~~ ~
Volume conductivity m/Gmm2 58 34.80 32.26127.8 3 1.90
Conductivity % IACS* 100 61/60 50148 55
Temperature coefficient of electrical resistance
per "Cu.20 (applicable over a working range of 3.93 x 10-1 4.03 X 10-'/3.96 X lo-' 3.3 x 10-'/3.168 x 3.63 x IO-'
100-200°c)
a10 at a particular conductivity
= at 100% conductivity x actual conductivity
of the metal.
~- ~ - ~~
Coefficient of linear expansion (thermal), (md'C) 1.73 x 2.3 x 2.3 10-5 2.3 x
(applicable over a working range of 20-200°C)
Mass resistivity = volume resistivity x density (~X2.gm/crn2) 15.328 7.786 83719.72 8.49
Notes
When using the above metals for the purpose of current carrying, their mechanical suitability must be checked with the data provided above to withstand, without permanent deformation, the
electrodynamic forces that may develop during a short-circuit condition (Section 28.4.2).
For important definitions, refer to Section 30.1.1.
These values are based on the mean values of a number of tests carried out on specimens of standard copper and aluminium conductors.
a IACS - International Annealed Copper Standard
Suffix M (now F) or WP (now T6) represent the type of tempering.
EIE, HE9 and E91E are old designations. They have now been replaced by 1350, 6063 A and 6101 A respectively.