46 C.F.R. § 111.10-3 Two generating sources.
Title 46 - Shipping
In addition to the emergency power sources required under part 112 of this chapter, each self-propelled vessel and each mobile offshore drilling unit must have at least two electric generating sources. [CGD 94–108, 61 FR 28276, June 4, 1996]
Title 46: Shipping
PART 111—ELECTRIC SYSTEMS—GENERAL REQUIREMENTS
Subpart 111.10—Power Supply
§ 111.10-3 Two generating sources.

