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The Power Systems Reliability Subcommittee of the IEEE Industry Applications Society has been conducting surveys of the reliability of electrical equipment in industrial plants and commercial buildings. Switchgear bus was included in a previous survey published in 1973 and 1974  and generated some controversy concerning bare and insulated bus. For this reason, and also for an ongoing effect to continually update the 1973 and 1974 survey , switchgear bus reliability has been investigated in a new survey in 1977, and the results are presented. Reference is made to a paper  given at the 1977 Industrial and Commercial Power Systems Technical Conference on reasons for conducting the new survey.