1625-0031 Stat/Authority

CFR-2011-title46-vol4-part112.pdf

Plan Approval and Records for Electrical Engineering Regulations Title 46 CFR Subchapter J.

1625-0031 Stat/Authority

OMB: 1625-0031

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Pt. 112

46 CFR Ch. I (10–1–11 Edition)

(2) Is used only for the industrial
function of the vessel;
(3) Is not connected to the emergency
power source; and
(4) Does not have specific requirements addressed elsewhere in this subchapter.
(b) An industrial system that meets
the applicable requirements of NFPA
NEC 2002 (incorporated by reference,
see 46 CFR 110.10–1) must meet only the
following:
(1) The switchgear standards in part
110, subpart 110.10, of this chapter.
(2) Part 110, subpart 110.25, of this
chapter—Plan Submittal.
(3) Subpart 111.01 of this part—General.
(4) Subpart 111.05 of this part—Equipment Ground, Ground Detection, and
Grounded Systems.
(5) Sections 111.12–1(b) and 111.12–
1(c)—Prime movers.
(6) Subpart 111.105 of this part—Hazardous Locations.
(c) Cables that penetrate a watertight or fire boundary deck or bulkhead must—
(1) Be installed in accordance with 46
CFR 111.60–5 and meet the flammability-test requirements of either IEEE
1202 or Category A of IEC 60332–3–22
(both incorporated by reference; see 46
CFR 110.10–1); or
(2) Be specialty cable installed in accordance with § 111.60–2.
[CGD 94–108, 61 FR 28286, June 4, 1996, as
amended at 62 FR 23910, May 1, 1997; USCG–
2003–16630, 73 FR 65201, Oct. 31, 2008]

Subpart 112.01—Definitions of Emergency
Lighting and Power Systems
Sec.
112.01–1 Purpose.
112.01–5 Manual emergency lighting and
power system.
112.01–10 Automatic emergency lighting and
power system.
112.01–15 Temporary
emergency
power
source.
112.01–20 Final emergency power source.
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Subpart 112.20—Emergency Systems Having a Temporary and a Final Emergency Power Source
112.20–1 General.
112.20–3 Normal source for emergency loads.
112.20–5 Failure of power from the normal
source or final emergency power source.
112.20–10 Diesel or gas turbine driven emergency power source.
112.20–15 Transfer of emergency loads.

Subpart 112.25—Emergency Systems Having an Automatic Starting Diesel Engine or Gas Turbine Driven Emergency
Power Source as the Sole Emergency
Power Source
112.25–1 General.
112.25–3 Normal source for emergency loads.
112.25–5 Failure of power from the normal
source.
112.25–10 Transfer of emergency loads.

Subpart 112.30—Emergency Systems Having an Automatically Connected Storage Battery as the Sole Emergency
Power Source
112.30–1 General.
112.30–3 Normal source of emergency loads.
112.30–5 Transfer of emergency loads.
112.30–10 Restoration of normal source potential.

Subpart
112.35—Manually
Controlled
Emergency Systems Having a Storage
Battery or a Diesel Engine or Gas Turbine Driven Generator as the Sole
Emergency Power Source

PART 112—EMERGENCY LIGHTING
AND POWER SYSTEMS

Subpart 112.05—General
112.05–1
112.05–3
112.05–5

Subpart 112.15—Emergency Loads
112.15–1 Temporary emergency loads.
112.15–5 Final emergency loads.
112.15–10 Loads on systems without a temporary emergency power source.

112.35–1 General.
112.35–3 Normal source for emergency loads.
112.35–5 Manually started emergency systems.
112.35–7 Activating means.

Subpart 112.37—Temporary Emergency
Power Source
112.37–1

General.

Subpart 112.39—Battery Operated Lanterns

Purpose.
Main-emergency bus-tie.
Emergency power source.

112.39–1
112.39–3

General.
Operation.

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Coast Guard, DHS

§ 112.05–1

Subpart 112.40—Alternating-Current
Temporary Source of Supply
112.40–1

§ 112.01–10 Automatic emergency lighting and power system.

General requirements.

Subpart 112.43—Emergency Lighting
Systems
112.43–1 Switches.
112.43–5 Controls on island type vessels.
112.43–7 Navigating
bridge
distribution
panel.
112.43–9 Signaling lights.
112.43–11 Illumination for launching operations.
112.43–13 Navigation light indicator panel
supply.
112.43–15 Emergency lighting feeders.

Subpart 112.45—Visible Indicators
112.45–1

A temporary emergency power source
is one of limited capacity that carries,
for a short time, selected emergency
loads while an emergency power source
of larger capacity is being started.
emergency

§ 112.05–1

112.55–1 General.
112.55–5 Emergency lighting loads.
112.55–10 Storage battery charging.
112.55–15 Capacity of storage batteries.
AUTHORITY: 46 U.S.C. 3306, 3703; Department of Homeland Security Delegation No.
0170.1.
SOURCE: CGD 74–125A, 47 FR 15267, Apr. 8,
1982, unless otherwise noted.

Subpart
112.01—Definitions
of
Emergency
Lighting
and
Power Systems
Purpose.

The purpose of this subpart is to define types of emergency lighting and
power systems.
§ 112.01–5 Manual emergency lighting
and power system.
A manual emergency lighting and
power system is one in which a single
manual operation, such as the manual
operation of a switch from an ‘‘off’’ to
an ‘‘on’’ position, is necessary to cause
the emergency power source to supply
power to the emergency loads.

Purpose.

(a) The purpose of this part is to ensure a dependable, independent, and
dedicated emergency power source
with sufficient capacity to supply
those services that are necessary for
the safety of the passengers, crew, and
other persons in an emergency and
those additional loads that may be authorized under paragraph (c) of this
section.
(b) No load may be powered from an
emergency power source, except:
(1) A load required by this part to be
powered from the emergency power
source;
(2) A bus-tie to the main switchboard
that meets § 112.05–3; and
(3) Emergency loads that may be necessary to maintain or restore the propulsion plant, such as control systems,
controllable pitch propellers, hydraulic
pumps, control air compressors, and
machinery necessary for dead-ship
start-up.
(c) Other loads may be authorized by
the Commanding Officer, Marine Safety Center (MSC), to be connected to
the emergency source of power to provide an increased level of safety in recognition of a unique vessel mission or

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power

Subpart 112.05—General

Subpart 112.55—Storage Battery
Installation

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emergency

A final emergency power source is
one that functions after the temporary
emergency power source is disconnected.

General.
Hydraulic starting.
Electric starting.
Compressed air starting.

§ 112.01–1

§ 112.01–15 Temporary
power source.

§ 112.01–20 Final
source.

Visible indicators.

Subpart 112.50—Emergency Diesel and
Gas Turbine Engine Driven Generator Sets
112.50–1
112.50–3
112.50–5
112.50–7

An automatic emergency lighting
and power system is one in which a reduction in potential from the ship’s
service power and lighting plant causes
the emergency power source to supply
power to the emergency loads.

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§ 112.05–3

46 CFR Ch. I (10–1–11 Edition)

configuration. When these loads are authorized, the emergency power source
must—
(1) Be sized to supply these loads
using a unity (1.0) service factor; or
(2) Be provided with automatic load
shedding that removes these loads and
operates before the emergency generator trips due to overload. The automatic load shedding circuit breakers
must be manually reset.

(b) Be arranged to prevent parallel
operation of an emergency power
source with any other source of electric power, except for interlock systems for momentary transfer of loads;
and
(c) If arranged for feedback operation, open automatically upon overload of the emergency power source before the emergency power source is
tripped off the line from the overload.

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28286, June 4,
1996; 61 FR 36787, July 12, 1996]

§ 112.05–5

§ 112.05–3 Main-emergency bus-tie.
Each bus-tie between a main switchboard and an emergency switchboard
must:
(a) Disconnect automatically upon
loss of potential at the emergency
switchboard;

Emergency power source.

(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 § 112.05–
1(c).

TABLE 112.05–5(a)
Size of vessel and service

Type of emergency power source or lighting

Passenger vessels:
Ocean, Great Lakes, or coastwise; or on an international voyage.

Other than Ocean, Great Lakes, or coastwise and
not on an international voyage.
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 coastwise and 500 GT or
more; on an international voyage and 500 GT or
more; or all waters and 1600 GT or more.
Ocean, Great Lakes, or coastwise and less than 500
GT; or other than ocean, Great Lakes, or coastwise, 300 GT or more but less than 1600 GT, and
not on an international voyage..

Period of operation
and minimum capacity
of emergency power

Temporary emergency power source; and
final emergency power source (automatically connected storage battery or an
automatically started generator).
Final emergency power source (automatically connected storage battery or an
automatically started generator).

36 hours.1 2

Final emergency power source (automatically connected storage battery or an
automatically started generator).
Emergency lighting provided by an automatically connected or manually controlled
storage battery; automatically or manually
started generator; or relay-controlled, battery-operated lanterns.3 4.

18 hours.1 2

8 hours or twice the
time of run, whichever is less.2

6 hours or twice the
time of run, whichever is less.

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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 § 111.93, is for a period of 30 minutes continuous operation.
3 The emergency lighting requirements of § 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 § 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;

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Coast Guard, DHS

§ 112.15–1

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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
§ 112.15–1 Temporary
emergency
loads.
On vessels required by § 112.05–5(a) to
have a temporary emergency power
source, the following emergency lighting and power loads must be arranged
so that they can be energized from the
temporary emergency power source:
(a) Navigation lights.
(b) Enough lights throughout machinery spaces to allow essential operations and observations under emergency conditions and to allow restoration of service.
(c) Lighting, including low location
lighting if installed, for passageways,
stairways, and escape trunks in passenger quarters, crew quarters, public
spaces, machinery spaces, damage control lockers, emergency equipment
lockers, and work spaces sufficient to
allow passengers and crew to find their
way to open decks and to survival
craft, muster stations, and embarkation stations with all watertight
doors and fire doors closed.
(d) Illuminated signs with the word
‘‘EXIT’’ in red letters throughout a
passenger vessel so the direction of escape to the open deck is obvious from
any portion of the vessel usually accessible to the passengers or crew, except
machinery spaces, and except stores
and similar spaces where the crew are
not normally employed. There must be
sufficient signs so that the direction of
escape is obvious, with all fire doors in
stairway enclosures and main vertical
zone bulkheads closed and all watertight doors closed. For the purpose of
this paragraph, an individual stateroom or other similar small room is
not required to have a sign, but the direction of escape must be obvious to a
person emerging from the room.
(e) Illumination to allow safe operation of each power operated watertight door.
(f) At least one light in each space
where a person may be maintaining, repairing, or operating equipment, stowing or drawing stores or equipment, or
transiting, such as public spaces, work
spaces, machinery spaces, workshops,
galleys, emergency fire pumprooms,
bow thruster rooms, storage areas for

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§ 112.15–5

46 CFR Ch. I (10–1–11 Edition)

paint,
rope,
and
other
stores,
underdeck passageways in cargo areas,
steering gear rooms, windlass rooms,
normally accessible duct keels with
valve operators, cargo handling rooms,
and holds of roll-on/roll-off vessels.
(g) Lighting for survival craft
launching, including muster stations,
embarkation stations, the survival
craft, its launching appliances and the
area of the water where it is to be
launched.
(h) Electric communication systems
that are necessary under temporary
emergency conditions and that do not
have an independent storage battery
source of power.
(i) Each power operated watertight
door system.
(j) All shipwide communications systems necessary for the transmittal of
information during an emergency.
(k) Each fire door holding and release
system.
(l) Supply to motor generator or
other conversion equipment if a temporary emergency power source of alternating current is necessary for essential communication systems or
emergency equipment.
(m) Each daylight signaling light.
(n) Each smoke detector system.
(o) Each electrically controlled or
powered ship’s whistle.
(p) Each fire detection system; and
gas detection system if installed.
(q) All lighting relative to helicopter
operations and landing if installed, unless provided for by another source of
power (such as independent batteries
separately charged by solar cells).
(r) Each general emergency alarm
system required by IMO SOLAS 74 (incorporated by reference; see 46 CFR
110.10–1).
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28286, June 4,
1996; USCG–2003–16630, 73 FR 65201, Oct. 31,
2008]

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§ 112.15–5

Final emergency loads.

On vessels required to have a final
emergency power source by § 112.05–5(a)
of this chapter, the following emergency lighting and power loads must be
arranged so that they can be energized
from the final emergency power source:
(a) Each load under § 112.15–1.

(b) The machinery, controls, and
alarms for each passenger elevator.
(c) Each charging panel for:
(1) Temporary emergency batteries;
(2) Starting batteries for diesel engines or gas turbines that drive emergency generators; and
(3) General alarm batteries.
(d) One of the bilge pumps, if the
emergency power source is its source of
power to meet Part 56 of this chapter.
(e) One of the fire pumps, if the emergency power source is its source of
power to meet the requirements of the
subchapter under which the vessel is
certificated.
(f) Each sprinkler system, water
spray extinguishing system, or foam
system pump.
(g) If necessary, the lube oil pump for
each propulsion turbine and reduction
gear, propulsion diesel reduction gear,
and ship’s service generator turbine
which needs external lubrication.
(h) Each rudder angle indicator.
(i) Each radio or global maritime distress and safety system (GMDSS) component.
(j) Each radio direction finder, radar,
gyrocompass, depth sounder, global positioning system (GPS), satellite navigation system (SATNAV), speed log,
rate-of-turn indicator and propeller
pitch indicator.
(k) Each steering gear feeder, if required by part 58, subpart 58.25, of this
chapter.
(l) Each general emergency alarm
flashing light required by § 113.25–10 of
this chapter.
(m) Each electric blow-out-preventer
control system.
(n) Any permanently installed diving
equipment that is dependent upon the
vessel’s or drilling unit’s power.
(o) Each emergency generator starting compressor, as allowed by § 112.50–
7(c)(3)(ii).
(p) Each steering gear failure alarm
required by part 113, subpart 113.43, of
this chapter.
(q) The ballast control system on
each column-stabilized mobile offshore
drilling unit.
(r) Each vital system automation
load required by part 62 of this chapter.
(s) Motor-operated valves for each
cargo oil and fuel oil system, if the
emergency power source is the source

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Coast Guard, DHS

§ 112.25–1

of power to meet § 56.60(d) of this chapter.
(t) Each ship’s stabilizer wing, unless
a separate source of emergency power
is supplied.
(u) Each indicator that shows the position of the stabilizer wings, if the
emergency power source is its emergency source of power.
(v) Each smoke extraction fan (not
including smoke detector sampling)
and CO2 exhaust fan for spaces.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996; 61 FR 36787, July 12, 1996; USCG–2010–
0759, 75 FR 60003, Sept. 29, 2010]

§ 112.15–10 Loads on systems without a
temporary
emergency
power
source.
If there is no temporary emergency
power source, the loads under § 112.15–1
must be arranged so that they can be
energized from the final emergency
power source.

Subpart 112.20—Emergency Systems Having a Temporary and
a Final Emergency Power
Source
§ 112.20–1 General.
This subpart contains requirements
applicable to emergency power installations having both a temporary and a
final emergency power source.

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§ 112.20–3 Normal source for emergency loads.
(a) The normal source for emergency
loads must be the ship’s service generating plant.
(b) The power from the ship’s service
generating plant for the emergency
loads must be supplied to the emergency switchboard through automatic
transfer switches.
§ 112.20–5 Failure of power from the
normal source or final emergency
power source.
(a) If there is a reduction of potential
of the normal source by 15 to 40 percent, the loads under § 112.15–1 must be
automatically supplied from the temporary emergency power source.
(b) For systems in which a reduction
of frequency of the normal source or
final emergency power source ad-

versely affects the emergency system
and emergency loads, there must be
means to transfer the loads under
§ 112.15–1 to the temporary emergency
power source upon a reduction in the
frequency of the normal source or final
emergency power source.
§ 112.20–10 Diesel or gas turbine driven emergency power source.
Simultaneously with the operation of
the transfer means under § 112.20–5, the
diesel engine or gas turbine driving the
final emergency power source must
start automatically with no load on
the final emergency power source.
§ 112.20–15
loads.

Transfer

of

emergency

(a) When the potential of the final
emergency power source reaches 85 to
95 percent of normal value, the emergency loads under § 112.15–5 must transfer automatically to the final emergency power source and, on a passenger
vessel, this transfer must be accomplished in no more than 45 seconds
after failure of the normal source of
power.
(b) When the potential from the normal source has been restored, the
emergency loads must be manually or
automatically transferred to the normal source, and the final emergency
power source must be manually or
automatically stopped.
(c) If the potential of the final emergency power source is less than 75 to 85
percent of normal value while supplying the emergency loads, the temporary emergency loads under § 112.15–1
must transfer automatically to the
temporary emergency power source.

Subpart 112.25—Emergency Systems Having an Automatic
Starting Diesel Engine or Gas
Turbine Driven Emergency
Power Source as the Sole
Emergency Power Source
§ 112.25–1

General.

This subpart contains requirements
applicable to emergency power installations having an automatic starting
diesel engine or gas turbine driven
emergency power source as the sole
emergency power source.

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§ 112.25–3

46 CFR Ch. I (10–1–11 Edition)

§ 112.25–3 Normal source for emergency loads.
(a) The normal source for emergency
loads must be the ship’s service generating plant.
(b) The power from the ship’s service
generating plant for the emergency
loads must be supplied to the emergency switchboard by an automatic
transfer switch located at the emergency switchboard.
§ 112.25–5 Failure of power from the
normal source.
If there is a reduction of potential of
the normal source by 15 to 40 percent,
the diesel engine or gas turbine driving
the final emergency power source must
start automatically with no load on
the emergency power source.
§ 112.25–10 Transfer
of
emergency
loads.
(a) When the potential of the final
emergency source reaches 85 to 95 percent of normal value, the emergency
loads under § 112.15–5 must transfer
automatically to the final emergency
power source and this transfer must be
accomplished in no more than 45 seconds after failure of the normal source
of power.
(b) When the potential from the normal source has been restored, the
emergency loads must be manually or
automatically transferred to the normal source, and the final emergency
power source must be manually or
automatically stopped.

Subpart 112.30—Emergency Systems Having an Automatically
Connected Storage Battery as
the Sole Emergency Power
Source

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§ 112.30–1 General.
This subpart contains requirements
applicable to emergency power installations having an automatically connected storage battery as the sole
emergency power source.
§ 112.30–3 Normal source for emergency loads.
(a) The normal source for emergency
loads must be the ship’s service generating plant.

(b) The power from the ship’s service
generating plant for the emergency
loads must be supplied to the emergency loads through automatic transfer switches.
§ 112.30–5 Transfer
loads.

of

emergency

If there is a reduction of potential of
the normal source by 15 to 40 percent,
the emergency loads under § 112.15–5
must transfer automatically from the
normal source to the emergency power
source.
§ 112.30–10 Restoration
source potential.

of

When the potential from the normal
source is restored to 85 to 95 percent of
its normal value, the emergency loads
must transfer automatically to the
normal source.

Subpart 112.35—Manually Controlled Emergency Systems
Having a Storage Battery or a
Diesel Engine or Gas Turbine
Driven Generator as the Sole
Emergency Power Source
§ 112.35–1

General.

This subpart contains requirements
applicable to emergency power installations having a manually controlled
storage battery, diesel engine, or gas
turbine driven generator as the sole
emergency power source.
§ 112.35–3 Normal
gency loads.

source

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emer-

The normal source for emergency
loads must be the ship’s service generating plant.
§ 112.35–5 Manually started emergency
systems.
Manually started emergency lighting
and power systems must be activated
by one manual operation, such as the
manual operation of a switch from an
‘‘off’’ to an ‘‘on’’ position, to cause the
emergency system to supply its connected loads.
§ 112.35–7

Activating means.

The activating means must be in the
navigating bridge or in a location

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Coast Guard, DHS

§ 112.43–7

where the means can be controlled by
the chief engineer.

conversion equipment must be provided
in duplicate.

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

Subpart 112.43—Emergency
Lighting Systems
§ 112.43–1

Subpart 112.37—Temporary
Emergency Power Source
§ 112.37–1 General.
Each temporary source of emergency
power required by Table 112.05–5(a)
must consist of a storage battery of
sufficient capacity to supply the temporary emergency loads for not less
than one-half hour.

Subpart 112.39—Battery Operated
Lanterns

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

§ 112.39–1 General.
(a) Each battery-operated, relay-controlled lantern used in accordance with
Table 112.05–5(a) must:
(1) Have rechargeable batteries;
(2) Have an automatic battery charger that maintains the battery in a fully
charged condition; and
(3) Not be readily portable.

§ 112.43–5
sels.

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

§ 112.39–3 Operation.
(a) The lanterns must be capable of
providing light for at least 3 hours.
(b) The lantern must be relay-controlled so that the loss of normal power
causes the lanterns to light.

§ 112.43–7 Navigating bridge distribution panel.
(a) Except as allowed in paragraph (b)
of this section, the following emergency lights must be supplied from a
distribution panel on the navigating
bridge:
(1) Navigation lights not supplied by
the navigation light indicator panel.
(2) Lights for survival craft launching operations under § 111.75–16, except
as allowed in § 112.43–5.
(3) Signaling lights.
(4) Emergency lights:
(i) On open decks;
(ii) On the navigating bridge;
(iii) In the chartroom;
(iv) In the fire control room; and
(v) For navigation equipment.
(b) On a mobile offshore drilling unit,
the distribution panel required in paragraph (a) of this section must be in the
control room.
(c) Each distribution panel required
in paragraphs (a) and (b) of this section

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

Subpart 112.40—Alternating-Current Temporary Source of
Supply

wreier-aviles on DSK3TPTVN1PROD with CFR

Switches.

An emergency lighting system must
not have a switch, except:
(a) In a distribution panel;
(b) As required in § 112.43–7; or
(c) In a circuit that serves a hazardous space such as a paint room or
cargo handling room if the switch is located outside of the hazardous location.

§ 112.40–1 General requirements.
Installations requiring alternating
current for the operation of communication equipment or other apparatus
essential under temporary emergency
conditions must be provided with the
necessary conversion equipment. If the
conversion equipment operates both
under normal conditions and under
temporary emergency conditions, the

Controls on island type ves-

On an island type vessel, such as a
containership, emergency lights for illumination of survival craft launching
operations must be controlled from a
central location within the island nearest the launching operations or from
the navigating bridge.

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§ 112.43–9

46 CFR Ch. I (10–1–11 Edition)

must have a fused switch or circuit
breaker for each branch circuit.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

§ 112.43–9

Signaling lights.

Each signaling light must be supplied
by a branch circuit that supplies no
other equipment.
§ 112.43–11 Illumination for launching
operations.
Branch circuits supplying power to
lights for survival craft launching operations must supply no other equipment and meet § 111.75–16 of this chapter.
[CGD 94–108, 61 FR 28287, June 4, 1996]

§ 112.43–13 Navigation light indicator
panel supply.
Each navigation light indicator panel
must be supplied:
(a) Directly from the emergency
switchboard; or
(b) Be a through feed, without switch
or overcurrent protection, from the
feeder supply the navigating bridge
emergency lighting panel.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

§ 112.43–15
ers.

Emergency

lighting

feed-

For a vessel with fire bulkheads
forming fire zones, at least one emergency lighting feeder must supply only
the emergency lights between two adjacent main vertical fire zone bulkheads. The emergency lighting feeder
must be separated as widely as practicable from any general lighting feeder supplying the same space.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

Subpart 112.45—Visible Indicators
wreier-aviles on DSK3TPTVN1PROD with CFR

§ 112.45–1

Visible indicators.

There must be visible indicators in
the machinery space to show;
(a) When an emergency battery is
discharging; and

(b) When the automatically controlled emergency power source is supplying the emergency loads.

Subpart 112.50—Emergency Diesel and Gas Turbine Engine
Driven Generator Sets
§ 112.50–1 General.
(a) The prime mover of a generator
set must have:
(1) All accessories necessary for operation and protection of the prime
mover; and
(2) A self-contained cooling system of
a size that ensures continuous operation with 100 degrees F (37 degrees C)
air.
(b) The fuel used must have a
flashpoint of not less than 110 degrees
F (43 degrees C).
(c) The room that has the generator
set must have intake and exhaust
ducts to supply adequate cooling air.
(d) The generator set must be capable
of carrying its full rated load within 45
seconds after cranking is started with
the intake air, room ambient temperature, and starting equipment at O°C.
The generator’s prime mover must not
have a starting aid to meet this requirement,
except
that
a
thermostatically-controlled
electric
water-jacket heater connected to the
final emergency bus is permitted.
(e) The generator set must start by
hydraulic, compressed air, or electrical
means.
(f) The generator set must maintain
proper lubrication when inclined to the
angles specified in § 112.05–5(c), and
must be arranged so that it does not
spill oil under a vessel roll of 30 degrees
to each side of the vertical.
(g) The generator set must shut down
automatically upon loss of lubricating
oil pressure, overspeed, or operation of
a fixed fire extinguishing system in the
emergency generator room (see § 111.12–
1(b) for detailed overspeed trip requirements).
(h) If the prime mover is a diesel engine, there must be an audible alarm
that sounds on low oil pressure and
high cooling water temperature.
(i) If the prime mover is a gas turbine, it must meet the shutdown and
alarm requirements in § 58.10–15(f) of
this chapter.

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Coast Guard, DHS

§ 112.55–1

(j) An independent fuel supply must
be provided for the prime mover.
(k) Each emergency generator that is
arranged to be automatically started
must be equipped with a starting device with an energy-storage capability
of at least six consecutive starts. A
second, separate source of starting energy may provide three of the required
six starts. If a second source is provided, the system need only provide
three consecutive starts.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996; USCG–2004–18884, 69 FR 58348, Sept. 30,
2004]

§ 112.50–3 Hydraulic starting.
A hydraulic starting system must
meet the following:
(a) The hydraulic starting system
must be a self-contained system that
provides the cranking torque and engine starting RPM recommended by
the engine manufacturer. The hydraulic starting system must be capable of
six consecutive starts, unless a second,
separate source of starting energy capable of three consecutive starts is provided. A second, separate source of
starting energy may provide three of
the required six starts. If a second
source is provided, the hydraulic system need only provide three consecutive starts.
(b) The stored hydraulic pressure
must be automatically maintained
within the predetermined pressure limits.
(c) The means of automatically
maintaining the hydraulic system
within the predetermined pressure limits must be electrically energized from
the final emergency bus.
(d) There must be a means to manually recharge the hydraulic system.
(e) Charging of the hydraulic starting
system must not cause insufficient hydraulic pressure for engine starting.

wreier-aviles on DSK3TPTVN1PROD with CFR

[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28287, June 4,
1996]

§ 112.50–5 Electric starting.
An electric starting system must
have a starting battery with sufficient
capacity for at least six consecutive
starts. A second, separate source of
starting energy may provide three of

the required six starts. If a second
source is provided, the electrical starting system need only provide three
consecutive starts.
[CGD 94–108, 61 FR 28288, June 4, 1996]

§ 112.50–7 Compressed air starting.
A compressed air starting system
must meet the following:
(a) The starting, charging, and energy storing devices must be in the
emergency generator room, except for
the main or auxiliary air compressors
addressed in paragraph (c)(3)(i) of this
section.
(b) The compressed air starting system must provide the cranking torque
and engine starting RPM recommended
by the engine manufacturer.
(c) The compressed air starting system must have an air receiver that
meets the following:
(1) Has a capacity for at least six consecutive starts. A second, separate
source of starting energy may provide
three of the required consecutive
starts. If a second source is provided,
the compressed air starting system
need only provide three consecutive
starts.
(2) Supplies no other system.
(3) Is supplied from one of the following:
(i) The main or auxiliary compressed
air receivers with a nonreturn valve in
the emergency generator room and a
handcranked, diesel-powered air compressor for recharging the air receiver.
(ii) An electrically driven air compressor that is automatically operated
and is powered from the emergency
power source. If this compressor supplies other auxiliaries, there must be a
non-return valve at the inlet of the
starting air receiver and there must be
a handcranked, diesel-powered air compressor for recharging the air receiver.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28288, June 4,
1996]

Subpart 112.55—Storage Battery
Installation
§ 112.55–1 General.
Each storage battery installation
must meet Subpart 111.15 of this chapter.

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§ 112.55–5

46 CFR Ch. I (10–1–11 Edition)

§ 112.55–5 Emergency lighting loads.
When supplying emergency lighting
loads, the storage battery initial voltage must not exceed the standard system voltage by more than 5 percent.
§ 112.55–10 Storage battery charging.
(a) Each storage battery installation
for emergency lighting and power, and
starting batteries for an emergency
diesel or gas turbine driven generator
set, must have apparatus to automatically maintain the battery fully
charged.
(b) When the ship’s service generating plant is available, the battery
must have a continuous trickle charge,
except that after discharge the battery
must be charged automatically at a
higher rate.
(c) Charging operations must not
cause an absence of battery power.
(d) There must be instruments to
show the rate of charge.
§ 112.55–15 Capacity of storage batteries.
(a) A storage battery for an emergency lighting and power system must
have the capacity—
(1) To close all watertight doors two
times;
(2) To open all watertight doors once;
and
(3) To carry the remaining emergency loads continuously for the time
prescribed in § 112.05–5(a), table 112.05–
5(a).
(b) At the end of the time specified in
paragraph (a) of this section, the potential of the storage battery must be
at least 88 percent of the standard voltage.
[CGD 74–125A, 47 FR 15267, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28288, June 4,
1996; 61 FR 39695, July 30, 1996]

PART 113—COMMUNICATION AND
ALARM SYSTEMS AND EQUIPMENT
Subpart 113.05—General Provisions

wreier-aviles on DSK3TPTVN1PROD with CFR

Sec.
113.05–5
113.05–7

Approved equipment.
Environmental tests.

Subpart 113.10—Fire and Smoke Detecting
and Alarm Systems
113.10–1

Approved equipment.

113.10–3
113.10–5
113.10–7
113.10–9

Cable runs.
Common return.
Connection boxes.
Power supply.

Subpart 113.20—Automatic Sprinkler
Systems
113.20–1
113.20–3

Sprinkler alarm system.
Connection boxes.

Subpart 113.25—General Emergency
Alarm Systems
113.25–1 Applicability.
113.25–3 Requirements.
113.25–5 Location of contact makers.
113.25–6 Power supply.
113.25–7 Power supply overcurrent protection.
113.25–8 Distribution of general emergency
alarm system feeders and branch circuits.
113.25–9 Location of general emergency
alarm signal.
113.25–10 Emergency red-flashing lights.
113.25–11 Contact makers.
113.25–12 Alarm signals.
113.25–14 Electric cable and distribution fittings.
113.25–15 Distribution panels.
113.25–16 Overcurrent protection.
113.25–20 Marking of equipment.
113.25–25 General emergency alarm systems
for manned ocean and coastwise barges.
113.25–30 General emergency alarm systems
for barges of 300 or more gross tons with
sleeping accommodations for more than
six persons.

Subpart 113.27—Engineers’ AssistanceNeeded Alarm
113.27–1

Engineers’ assistance-needed alarm.

Subpart 113.30—Internal Communications
113.30–1 Applicability.
113.30–3 Means of communications.
113.30–5 Requirements.
113.30–20 General requirements.
113.30–25 Detailed requirements.

Subpart 113.35—Engine Order Telegraph
Systems
113.35–1 Definitions.
113.35–3 General requirements.
113.35–5 Electric engine order telegraph systems.
113.35–7 Electric engine order telegraph systems; operations.
113.35–9 Mechanical engine order telegraph
systems.
113.35–13 Mechanical engine order telegraph
systems; operation.
113.35–15 Mechanical engine order telegraph
systems; application.

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