Marine Electrical Systems USCG Question #877 (Set 30)

Referring to the containership one-line distribution diagram shown in the illustration, what statement is true concerning the battery charger? EL-0014

USCG Exam Illustration EL-0014
USCG Examination Diagram: Illustration EL-0014
Official USCG Answer & Rule Citation

Correct Answer: Option C — The battery charger gets its AC power from the 120 VAC section of the emergency switchboard and is capable of providing DC charging current to only one battery bank at a given time.

Emergency battery chargers are powered from the emergency 120 VAC switchboard to ensure reliability during a blackout. Per 46 CFR Subchapter J and IEEE 45, these chargers are typically configured with selector switches or control logic to supply DC charging current to only one designated battery bank at a time.

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