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Electrical insulation used in circuit breakers and various switching devices may be subjected to periodic arcing in the vicinity of moving contacts. Other insulating components are frequently under voltage stress and become susceptible to surface tracking when surface contaminants are present. It has been necessary for the insulation engineer to develop test methods for evaluating the arc and track...
At this Conference last year, one of us summarized the results of standard surface-tracking resistance tests, both wet and dry, on a large number of polymers, and showed how some of these results depended on polymer chemical structure and filler content1. It was further indicated that the wet tracking resistance of many materials (measured by a "standard" dust-fog test procedure) was often...
Surface carbon tracking of insulating members in electrical equipment is a problem which is receiving increased attention from both suppliers and users of electrical components. The principle emphasis towards the solution of this problem has been placed on the development of track resistant insulating materials which are capable of being formed by various techniques into solid track resistant insulating...
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