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Chapter three

Electrical Insulation

Insulation is required to keep electrical conductors separated from each other and from other nearby objects. Ideally, insulation should be totally non-conducting, for then currents are totally restricted to the intended conductors. However, insulation does conduct some current and so must be regarded as a material of very high resistivity. In many applications, the current flow due to conduction through the insulation is so small that it may be entirely neglected. In some instances the conduction currents, measured by very sensitive instruments, serve as a test to determine the suitability of the insulation for use in service.

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