46 C.F.R. § 111.05-29 Dual voltage direct current systems.
Title 46 - Shipping
Each dual voltage direct current system must have a suitably sensitive ground detection system which indicates current in the ground connection, has a range of at least 150 percent of neutral current rating and indicates the polarity of the fault. [CGD 94–108, 61 FR 28276, June 4, 1996] Grounded Conductors
Title 46: Shipping
PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.05—Equipment Ground, Ground Detection, and Grounded Systems
§ 111.05-29 Dual voltage direct current systems.
