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Electrical Applications 2 by David W. Tyler

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40
Materials
and their
applications
in the
electrical
industry
is to produce cables which are smaller for a given tensile strength
than copper or, although larger for a given resistance, much
stronger than copper. The table details some of the electrical and
mechanical properties of copper and aluminium.
Cables joined using split ferrule
and soft solder
Compression sleeve joining overhead
lines
Crimped terminal on cable end
Figure 4.2
Property
Weight
Resistivity
Strength
Flexibility
Copper
87 200 N/m
3
1.73 x IO
8
Ì2m
(0.975 as good as silver)
Ultimate
320 MN/m
2
When annealed, quite good.
Used hard for cable