Electrical basics — generators, motors, and safety

46 CFR §111.01-3

§ 111.01-3 -3 Placement of equipment. (a) Electric equipment must be arranged, as far as practicable, to prevent mechanical damage to the equipment from the accumulation of dust, oil vapors, steam, or dripping liquids. (b) Apparatus that may arc must be ventilated or be in ventilated compartments in which flammable gases, acid fumes, and oil vapors cannot accumulate. Skylights and ventilators must be arranged to prevent flooding of the apparatus.

46 CFR §111.01-5

§ 111.01-5 -5 Protection from bilge water. Each of the following in or around the bilge area must be arranged or constructed so that it cannot be damaged by bilge water: (a) Generators. (b) Motors. (c) Electric coupling. (d) Electric cable. [CGD 94-108, 61 FR 28275, June 4, 1996]

46 CFR §111.05-17

§ 111.05-17 -17 Generation and distribution system grounding. The neutral of each grounded generation and distribution system must: (a) Be grounded at the generator switchboard, except the neutral of an emergency power generation system must be grounded with: (1) No direct ground connection at the emergency switchboard; (2) The neutral bus permanently connected to the neutral bus on the main switchboard; and (3) No switch, circuit breaker, or fuse in the neutral conductor of the bus-tie feeder connecting the emergency switchboard to the main switchboard; and (b) Have the ground connection accessible for checking the insulation resistance of the generator to ground before the generator is connected to the bus.

46 CFR §111.12-11

§ 111.12-11 -11 Generator protection. (a)This section applies to each generator except a propulsion generator. (b)Each ship's service generator and emergency generator must be protected by an individual, tripfree, air circuit breaker whose tripping characteristics can be set or adjusted to closely match the generator capabilities and meet the coordination requirements of Subpart 111.51. Each circuit breaker must contain the trips required by this section. (c)A circuit breaker for a generator must: (1) Open upon the shutting down of the prime mover; (2) Have longtime overcurrent trips or relays set as necessary to coordinate with the trip settings of the feeder circuit breakers; and (3) Not have an instantaneous trip with the exception that an instantaneous trip is required if: (i) T…

46 CFR §111.12-9

§ 111.12-9 -9 Generator cables. (a) The current-carrying capacity of generator cables must not be: (1) Less than 115 percent of the continuous generator rating; or (2) Less than 115 percent of the overload for a machine with a 2 hour or greater overload rating. (b) Generator cables must not be in the bilges.

46 CFR §111.25-1

§ 111.25-1 -1 General requirements. The requirements for generators contained in § 111.12-5 apply to motors. [CGD 74-125A, 47 FR 15236, Apr. 8, 1982, as amended by CGD 94-108, 62 FR 23908, May 1, 1997]