electrical-engineering-portal.com http://electrical-enginee ring-portal.com/methods-of-secu ring-lv-circuit-breakers Edvard Methods Of Securing L V Circuit B reakers Methods Of Securing Circuit Breakers (photo credit: Schneider Electric; Acti 9 miniature circuit breakers range) Methods Circuit breakers are typically secured in place by one of the following methods: Bolted Type Breakers When a longer service life breakeris wanted, a bolted type is typically used. These types have a metal tab (one for each phase) sticking o ut from one end that is bolted to the busbar with a machine s crew (bolt type fine threads and not sheet metal screw type steep pitch threads). When replacing these types of breakers, the retaining bolts or machine screws will have power on them unless power to the entire panelboard has been removed. It is not un-common for some individuals to initially determine that it is necessary to replace these types ofbreakers with power still applied to the busbars . I am not a big fan of working any thing above 12 volts hot, for I have witnessed too many good folks get hurt doing what was initially anticipated as being a quick and simple task. When this type of breaker must be replaced with power still applied to the busbars, it should be done only understrict safety procedures; using proper personnel protective equipment and double insulated tools(every day plastic handle screwdrivers must not be used). A detailed job safety analysis should be conducted before any hot
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