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- Q615 - Electrical, Electronic, & Control Engineering
138. A low voltage, high current testing unit consisting of an autotransformer, ammeter, and timer may be used to test the proper tripping function of a three-pole magnetic circuit breaker. What is the correct procedure for using this apparatus?
To test a three-pole magnetic circuit breaker, each pole must be tested individually with the common tripping bar attached and the ammeter around a single conductor to accurately measure current and verify proper tripping of all poles.
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