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- Q536 - Electrical, Electronic, & Control Engineering
309. You are in the planning stages of setting the instantaneous trip of a ship's service generator circuit breaker. According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true regarding the criteria for the instantaneous trip set point, assuming the generator is capable of being paralleled?
For a paralleled ship's service generator, the instantaneous trip set point must be above, but as close as practical, to the maximum asymmetrical short-circuit current to ensure selective coordination and rapid clearing of severe internal faults, as mandated by 46 CFR Subchapter J.
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