46 CFR §169.666

1. (a)Each vessel of more than 65 feet in length having only electrically driven fire and bilge pumps must have two generators. One of these generators must be driven by a means independent of the auxiliary propulsion plant. A generator that is not independent of the auxiliary propulsion plant must meet the requirements of § 111.10-4(c) of this chapter.
2. (b)Each generator and motor must be in a location that is accessible, adequately ventilated, and as dry as practicable.
3. (c)Each generator and motor must be mounted as high as practicable above the bilges to avoid damage by splash and to avoid contact with low lying vapors.
4. (d)Each generator must be protected from overcurrent by a circuit breaker, fuse or an overcurrent relay.