46 C.F.R. § 169.672 Wiring for power and lighting circuits.
Title 46 - Shipping
(a) Wiring for power and lighting circuits must have copper conductors, of 14 AWG or larger, and— (1) Meet Article 310–8 and Table 310–13 of the National Electrical Code; (2) Be listed as “50 volt boat cable”; or (3) Meet subpart 111.60 of this chapter. (b) Wiring for power and lighting circuits on new vessels must have stranded conductors. (c) Conductors must be sized so that— (1) They are adequate for the loads carried; and (2) The voltage drop at the load terminals is not more than 10 percent.
Title 46: Shipping
PART 169—SAILING SCHOOL VESSELS
Subpart 169.600—Machinery and Electrical
Electrical Installations Operating at Potentials of Less Than 50 Volts on Vessels of Less Than 100 Gross Tons
§ 169.672 Wiring for power and lighting circuits.

