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Electrical Applications 2 by David W. Tyler

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4 Materials and their
applications in the
electrical industry
Aims:
At the end of this chapter you should be able to:
Compare aluminium and copper as conductor materials.
Explain the effect on
cable rating
of ambient
temperature
and
apply
grouping
factors.
Use
tables to determine
cable
sizes for specified
loadings
and situ-
ations.
Describe
the construction of printed
circuit
boards and
explain
the
need to limit the current density in the conductors.
Explain why heat sinks are necessary for many
electronic
devices.
Explain why dielectrics fail in service.
Describe
the constructional
details
of
a range
of
cables.
Explain why
core losses occur in iron-cored coils
and transformers.
Compare the properties of permanent magnet steels with those of
soft ferro-magnetic materials.
Describe the
required
properties for core
materials
for use with a
range
of frequencies.
The bes