46 CFR §129.315

1. (a)The requirements of this section apply to OSVs between 100 GRT and 500 GRT or less than 6,000 GT ITC instead of those in subpart 111.10 of this chapter.
2. (b)If a generator provides electrical power for any system identified as a vital system by § 128.130(a) of this subchapter, at least two power-generating sets must be provided. At least one set must be independent of the main propulsion plant. A generator not independent of the main propulsion plant must comply with § 111.10-4(d) of this chapter. With any one generating set stopped, the remaining set or sets must provide the power necessary for the loads required by this section.