Referring to the containership one-line...

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Question 1 of 2066636eed28f7522a1c51d989

Referring to the containership one-line distribution diagram shown in the illustration, what is the purpose of the feedback circuit breaker as used to bypass the automatic bus transfer device? Illustration EL-0014

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🔍 Key Concepts

• Automatic Bus Transfer (ABT) function between the main switchboard and the emergency switchboard • Normal direction of power flow between the main bus, emergency bus, and emergency generator on the one-line diagram • Regulatory/typical practice about paralleling an emergency generator with ship’s service generators

💭 Think About

• Trace how the emergency switchboard is normally supplied when the ship is in normal operation, and what changes when the main bus becomes de‑energized • Follow the path of power if the ship is completely dead and only the emergency generator is running – how could you re‑energize the main bus from the emergency side? • Consider whether, in standard ship designs, the emergency generator is intended to run in parallel with the ship’s service generators, or kept isolated

✅ Before You Answer

• Identify which breaker(s) must be closed to let power flow from the emergency generator toward the main switchboard in a dead‑ship condition • Decide whether the feedback breaker is normally open or closed in routine operation, based on the diagram and the word "feedback" • Verify whether SOLAS/USCG practice generally permits or prohibits paralleling the emergency generator with the main ship’s service generators

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