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Question 1 of 2066636eed28f7522a1c51d8ce

You are in the planning stages of setting the longtime overcurrent 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 longtime overcurrent trip setpoint, assuming the generator is capable of being paralleled?

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Question 1 of 20

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🔍 Key Concepts

• 46 CFR Subchapter J requirements for generator circuit breaker protective devices • Difference between continuous rated generator capacity and trip setting percentage • Special considerations when generators are capable of being paralleled

💭 Think About

• Ask yourself: should a longtime overcurrent trip normally be set above, at, or below the continuous current rating to provide protection but also allow normal loading? • How would setting the trip too low affect the generator when multiple units are paralleled and sharing load? • How would setting the trip too high affect protection of the generator windings and cables during overloads?

✅ Before You Answer

• Verify in 46 CFR Subchapter J that there is a specific minimum percentage of generator rating required for the longtime overcurrent trip on continuous rated machines. • Check whether the regulation specifies a maximum or a minimum setting, and be sure you are not mixing them up. • Confirm that the requirement explicitly applies to generators capable of being paralleled, not single, non-paralleling units.

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