Three standard tracking test methods have been developed, which are in active use in evaluating materials for medium voltage applications of electrical insulation. A fourth method, intended for evaluation of materials for low voltage applications, is in the interlaboratory development stage. A fifth method is being developed specifically for outdoor medium voltage insulation applications. Each of the test methods exhibits different advantages and disadvantages. Test methods must be selected based on testing objectives.
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GR Mitchell (1974) studied this question.
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