The 24 volt DC bus on the emergency switchboard is used to supply power to what system or equipment?
Official USCG Answer & Rule Citation
Correct Answer: Option B — general alarm and vital communication systems
Title 46 CFR Subchapter J and SOLAS requirements mandate that the emergency switchboard's 24-volt DC bus continuously powers vital safety systems, including the general alarm, fire detection, and critical internal communication circuits.
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