46 C.F.R. § 111.15-25 Overload and reverse current protection.
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(a) An overload protective device must be in each battery conductor, except conductors of engine cranking batteries and batteries with a nominal potential of 6 volts or less. For large storage battery installations, the overcurrent protective devices must be next to, but outside of, the battery room. (b) Except when a rectifier is used, the charging equipment for all batteries with a nominal voltage more than 20 percent of line voltage must protect automatically against reversal of current.
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PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.15—Storage Batteries and Battery Chargers: Construction and Installation
§ 111.15-25 Overload and reverse current protection.
