Summary Electrical switchgear, such as circuit breakers and switches, requires regular inspection, maintenance, and testing to ensure that the equipment works as it is designed to work. Although many of the same tasks are performed for different types of switchgear, some tasks are specific to a particular type. For example, switchgear that contains a vacuum bottle interrupter is tested to check the condition of the vacuum in the vacuum bottle. This 28-minute DVD describes where vacuum interrupters are used in a substation, how they work, and how they are tested.
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