(a) The emergency power source must meet table 112.05-5(a) and have the capacity to supply all loads that are simultaneously connected to it, except a load on a bus-tie to the main switchboard or non-required loads that are connected in accordance with Sec. 112.05-1(c).
Table 112.05-5(a)------------------------------------------------------------------------
Period of
Type of emergency operation and
Size of vessel and service power source or minimum capacity
lighting of emergency
power------------------------------------------------------------------------Passenger vessels:
Ocean, Great Lakes, or Temporary emergency 36 hours.\1 2\
coastwise; or on an power source; and
international voyage. final emergency power
source (automatically
connected storage
battery or an
automatically started
generator).
Other than Ocean, Great Final emergency power 8 hours or twice
Lakes, or coastwise and not source (automatically the time of
on an international voyage. connected storage run, whichever
battery or an is less.\2\
automatically started
generator).Cargo vessels; miscellaneous
self-propelled vessels;
tankships; barges with
sleeping accommodations for
more than 6 persons; mobile
offshore drilling units; and
oceanographic vessels:
Ocean, Great Lakes, or Final emergency power 18 hours.\1 2\
coastwise and 500 GT or source (automatically
more; on an international connected storage
voyage and 500 GT or more; battery or an
or all waters and 1600 GT automatically started
or more. generator).
Ocean, Great Lakes, or Emergency lighting 6 hours or twice
coastwise and less than 500 provided by an the time of
GT; or other than ocean, automatically run, whichever
Great Lakes, or coastwise, connected or manually is less.
300 GT or more but less controlled storage
than 1600 GT, and not on an battery;
international voyage.. automatically or
manually started
generator; or relay-
controlled, battery-
operated lanterns.\3
4\.------------------------------------------------------------------------\1\ A 12-hour power supply may be especially considered for vessels
engaged regularly in voyages of short duration.\2\ The capacity for the operation of the steering gear, as required by
Sec. 111.93, is for a period of 30 minutes continuous operation.\3\ The emergency lighting requirements of Sec. 112.15-1 (b), (c),
(f), and (g) must be met.\4\ Requirements of Subpart 112.39 must be met by the relay-controlled,
battery-operated lanterns.
(b) The emergency power source must be independent of the ship's service lighting and powerplant and propulsion plant, except for the compressed air starting means allowed in Sec. 112.50-7(c)(3)(i). A stop control for an emergency generator must be only in the space that has the emergency generator, except a remote mechanical reach rod is permitted for the fuel oil shut-off valve to an independent fuel oil tank located in the space.
(c) The complete emergency installation must function at full rated power when the vessel is upright or inclined to the maximum angle of heel that results from the assumed damage defined in 33 CFR part 155 or in subchapter S of this chapter for the specific vessel type or 22.5 degrees, whichever is greater; when the trim of the ship is 10 degrees, either in the fore or aft direction, or is in any combination of angles within those limits.
(d) The emergency power source, its associated transforming equipment, and the emergency switchboard must be located aft of the collision bulkhead, outside of the machinery casing, and above the uppermost continuous deck. Each compartment containing this equipment must be readily accessible from the open deck and must not contain machinery not associated with, or equipment not in support of, the normal operation of the emergency power source. Equipment in support of the normal operation of the emergency power source includes, but is not limited to, ventilation fans, CO2 bottles, space heaters, and internal communication devices, such as sound powered phones.
(e) No compartment that has an emergency power source or its vital components may adjoin a Category A machinery space or those spaces containing the main source of electrical power and its vital components.
(f) Except for a cable for connecting equipment in the engineroom or boilerroom, no cable supplied from the emergency switchboard may penetrate the boundaries of the engineroom, boilerroom, uptakes, or casings of these spaces. These cables must be kept clear of the bulkheads and decks forming these boundaries. No emergency circuit in an engineroom or a boilerroom may supply equipment in any other space.
(g) The emergency switchboard must be as near as practicable to the emergency power source but not in the same space as a battery emergency power source.
(h) If the emergency power source is a generator, the emergency switchboard must be in the same space as the emergency power source.
(i) The prime mover of an emergency generator must be either a diesel engine or a gas turbine. [CGD 74-125A, 47 FR 15267, Apr. 8, 1982, as amended by CGD 94-108, 61 FR 28286, June 4, 1996; 62 FR 23910, May 1, 1997]
Subpart 112.15_Emergency Loads