According to 46 CFR, Subchapter J (Electrical Engineering), which of the following statements concerning battery installations is correct?

Correct Answer: Option D — When power ventilation is required, blower blades must be nonsparking and the system must be interlocked with the battery charger to prevent charger operation unless the ventilation fan is running.

46 CFR Subchapter J mandates that battery room power ventilation must utilize nonsparking blower blades and an interlock system preventing charger operation unless the exhaust fan is running, mitigating hydrogen gas accumulation hazards.