1625-0031 Stat/Authority

§ 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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Coast Guard, DHS
113.35–17 Vessels
control.

with

§ 113.10–9
navigating

bridge

Subpart 113.37—Shaft Speed and Thrust
Indicators
113.37–1 Applicability.
113.37–5 General requirements.
113.37–10 Detailed requirements.

reference; see 46 CFR 110.10–1) or the
applicable ENV category of Lloyd’s
Register Type Approval System—Test
Specification Number 1 (incorporated
by reference; see 46 CFR 110.10–1); and
(b) IEC 60533 (incorporated by reference; see 46 CFR 110.10–1) as appropriate.
[CGD 94–108, 61 FR 28288, June 4, 1996, as
amended by 62 FR 23910, May 1, 1997; USCG–
2003–16630, 73 FR 65201, Oct. 31, 2008]

Subpart 113.40—Rudder Angle Indicator
Systems
113.40–1 Applicability.
113.40–5 General requirements.
113.40–10 Detailed requirements.

Subpart 113.10—Fire and Smoke
Detecting and Alarm Systems

Subpart 113.43—Steering Failure Alarm
Systems
113.43–1
113.43–3
113.43–5

§ 113.10–1 Approved equipment.
Each alarm annunciator, fire detector, test station, manual station, and
vibrating bell must be approved under
Subpart 161.002 of this chapter and
meet the requirements of this subpart.

Applicability.
Alarm system.
Power supply.

Subpart 113.45—Refrigerated Spaces
Alarm Systems
113.45–5

General requirements.

Subpart 113.50—Public Address Systems
113.50–1 Applicability.
113.50–5 General requirements.
113.50–10 Additional requirements for passenger vessels.
113.50–15 Loudspeakers.
113.50–20 Distribution of cable runs.

Subpart 113.65—Whistle Operators
113.65–5

General requirements.

AUTHORITY: 46 U.S.C. 3306, 3703; Department of Homeland Security Delegation No.
0170.1.
SOURCE: CGD 74–125A, 47 FR 15272, Apr. 8,
1982, unless otherwise noted.

Subpart 113.05—General
Provisions

§ 113.10–3 Cable runs.
Cable runs between the fire alarm annunciator and fire detecting or fire
alarm zones must be as direct as practicable and, where practicable, must
not be in staterooms, lockers, or other
enclosed spaces in order to reduce the
risk of damage by a localized fire or
other cause.
§ 113.10–5 Common return.
A conductor must not be used as a
common return from more than one
zone.
§ 113.10–7 Connection boxes.
Each connection box must be constructed in accordance with Type 4 or
4X of NEMA 250 or IP 56 of IEC 60529
(both incorporated by reference; see 46
CFR 110.10–1) requirements.
[USCG–2003–16630, 73 FR 65201, Oct. 31, 2008]

§ 113.05–5 Approved equipment.
If approved equipment is required in
this part, that equipment must be specifically approved by the Commandant.

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NOTE: Many specifications for equipment
that must be approved are in Subchapter Q
for this chapter.

§ 113.05–7 Environmental tests.
Communication, alarm system, control, and monitoring equipment must
meet the environmental tests of—
(a) Section 4–9–7, Table 9, of ABS
Steel Vessel Rules (incorporated by

§ 113.10–9 Power supply.
(a) General. There must be at least
two sources of power for the electrical
equipment of each fire detecting and
alarm system. The normal source must
be the main power source. The other
source must be the emergency power
source or an automatically charged
battery. If the other source is an automatically charged battery, the charger
must be supplied from the final emergency power source. Upon loss of power
to the system from the normal source,

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§ 113.20–1

46 CFR Ch. I (10–1–11 Edition)

the system must be automatically supplied from the other source.
(b) Batteries. Each battery used in a
fire detecting and alarm system must
meet Subpart 111.15 of this chapter.
(c) Capacity of power supply branch
circuit. The capacity of each branch circuit providing power to a fire detection
or alarm system must not be less than
125 percent of the maximum load.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28288, June 4,
1996]

Subpart 113.20—Automatic
Sprinkler Systems
§ 113.20–1

Sprinkler alarm system.

Each sprinkler alarm system, including annunciator, power supply, alarm
switches, and bells, must meet Subpart
76.25 of this chapter.
§ 113.20–3

Connection boxes.

Each connection box and each switch
enclosure in an automatic sprinkler
system must be constructed in accordance with Type 4 or 4X of NEMA 250 or
IP 56 of IEC 60529 (both incorporated by
reference; see 46 CFR 110.10–1) requirements.
[USCG–2003–16630, 73 FR 65201, Oct. 31, 2008]

Subpart 113.25—General
Emergency Alarm Systems
EDITORIAL NOTE: Nomenclature changes to
subpart 113.25 appear at 61 FR 28288, June 4,
1996.

wreier-aviles on DSK3TPTVN1PROD with CFR

§ 113.25–1

Applicability.

(a) This subpart, except §§ 113.25–25
and 113.25–30, applies to each manned
vessel of over 100 gross tons, except
barges, scows, and similar vessels.
(b) Section 113.25–25 applies to each
manned ocean and coastwise barge of
over 100 gross tons if the crew is divided into watches for the purpose of
steering.
(c) Section 113.25–30 applies to each
barge of 300 or more gross tons that has
sleeping accommodations for more
than six persons.

§ 113.25–3

Requirements.

Each vessel must have a general
emergency alarm system that meets
the requirements of this subpart.
§ 113.25–5

Location of contact makers.

(a) Passenger vessels and cargo and
miscellaneous vessels. Each passenger
vessel, cargo vessel, and miscellaneous
vessel must have a manually operated
contact maker for the general emergency alarm system:
(1) In the navigating bridge; and
(2) At the feeder distribution panel if
the general alarm power supply is not
in or next to the navigating bridge.
(b) Tank vessels. Each tank vessel
must have a manually operated contact maker for the general emergency
alarm system:
(1) In the navigating bridge;
(2) At the deck officers’ quarters farthest from the engineroom;
(3) in the engineroom;
(4) At the location of the emergency
means of stopping cargo transfer required under 33 CFR 155.780; and
(5) At the feeder distribution panel if
the general alarm power supply is not
in or next to the navigating bridge.
(c) Mobile offshore drilling units. Each
mobile offshore drilling unit must have
a manually operated contact maker for
the general emergency alarm system:
(1) In the main control room;
(2) At the drilling console;
(3) At the feeder distribution panel;
(4) In the navigating bridge, if a navigating bridge is installed; and
(5) In a routinely occupied space that
is as far as practicable from all other
contact makers.
(d) Additional contact maker. A vessel
must not have more than one other
contact maker that operates the general emergency alarm system in addition to those required under paragraph
(a), (b), or (c) of this section unless the
installation of other contact makers
has been accepted by the Commandant.
(e) Special system. If a vessel has an
emergency squad when operating, has a
manual fire alarm system, or is an
ocean-going passenger vessel, it must
have:
(1) An independent manually operated contact maker in the navigating
bridge that is connected to operate

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Coast Guard, DHS

§ 113.25–9

only the general emergency alarm signal in crew’s quarters and machinery
spaces; or
(2) A separate alarm system that
sounds in the crew’s quarters and machinery spaces.
§ 113.25–6

Power supply.

The emergency power source for the
general emergency alarm system must
meet the requirements of IMO SOLAS
74 (incorporated by reference; see 46
CFR 110.10–1), Regulation II–1/42 or II–1/
43, as applicable.
[USCG–2003–16630, 73 FR 65201, Oct. 31, 2008]

§ 113.25–7 Power
protection.

supply

overcurrent

(a) If the general emergency alarm
system is the only load supplied by the
general emergency alarm system battery or batteries, the battery or batteries must have an enclosed fused
switch or circuit breaker that has a
means of locking. The fused switched
or circuit breaker must be outside of,
and next to, the battery room or battery locker, and the capacity of the
fuses or circuit breaker must be at
least 200 percent of the connected load.
(b) If the general emergency alarm
system is supplied from an emergency
or interior communication switchboard, or if duplicate general alarm
batteries supply other loads as allowed
under § 113.25–6(e)(2), there must be a
fused switch or circuit breaker supplying the general emergency alarm
system that has a means of locking.

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§ 113.25–8 Distribution
of
general
emergency alarm system feeders
and branch circuits.
(a) Each system must have a feeder
distribution panel to divide the system
into the necessary number of zone,
feeders, except where, because of the
arrangement of the vessel, only one
zone feeder is necessary; then a branch
circuit distribution panel or feeder distribution panel must be used.
(b) The feeder distribution panel
must have overcurrent protection for
each zone feeder, but there must be no
disconnect switches.
(c) The feeder distribution panel
must be in an enclosed space next to
the general alarm power supply.

(d) Each system must have at least
one feeder for each vertical fire zone
that has general emergency alarm signal.
(e) Each system must have one or
more branch circuit distribution panels
for each zone feeder, with at least one
fused branch circuit for each deck
level. The distribution panel must be
above the uppermost continuous deck,
in the zone served, and there must be
no disconnect switches for the branch
circuits.
(f) A branch circuit must not supply
emergency alarm signal on more than
one deck level, except for a single
branch circuit supplying all levels of a
single space containing more than one
deck level if all other requirements of
this section are met.
(g) On a vessel not divided into fire
zones by main vertical fire bulkheads,
the general emergency alarm system
must be arranged into vertical service
zones not more than 40 meters (131
feet) long, and there must be a general
alarm feeder for each of these zones
that has general emergency alarm signal.
(h) General alarm feeders and branch
circuit cables must be in passageways
and must not be in staterooms, lockers, galleys, machinery spaces, or other
enclosed spaces, unless it is necessary
to supply general emergency alarm signal in those spaces.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28288, June 4,
1996]

§ 113.25–9 Location of general emergency alarm signal.
General emergency alarm signal
must:
(a) Be located in passenger and crew
quarters areas where they can alert
persons in spaces where those persons
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 firepump room, bow thruster rooms, storage areas for paint, rope,
and other stores, underdeck passageways in cargo areas, steering gear
rooms, windless rooms, holds of roll-on/
roll-off vessels, and, except those that
are accessible only through bolted

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§ 113.25–10

46 CFR Ch. I (10–1–11 Edition)

manhole covers, duct keels with valve
operators; and
(b) Be audible in the spaces identified
in paragraph (a) of this section with all
normally closed doors and accesses
closed; and
(c) Be installed in cabins without
loudspeaker installation. Other audible
devices, such as electronic alarm transducers, are permitted.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28288, June 4,
1996]

§ 113.25–10
lights.

Emergency

red-flashing

(a) In a space described in § 113.25–
9(a), where the general emergency
alarm signal cannot be heard over the
background noise, there must be a redflashing light or rotating beacon, in addition to the general emergency alarm
signal, that:
(1) Has sufficient intensity above the
background lighting that would alert
personnel in the space;
(2) Is activated whenever the general
emergency alarm signal in the space
are activated; and
(3) Is supplied by the general emergency alarm system power supply or
the vessel emergency power source
through a relay that is operated by the
general emergency alarm system.
(b) A red-flashing light or rotating
beacon must be installed so that it is
visible in the cargo pump rooms of vessels that carry combustible liquid cargoes. The installation must be in accordance with the requirements of part
111, subpart 111.105, of this chapter.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28288, June 4,
1996; 62 FR 23910, May 1, 1997]

wreier-aviles on DSK3TPTVN1PROD with CFR

§ 113.25–11

Contact makers.

Each contact maker must—
(a) Have normally open contacts and
be constructed in accordance with
Type 4 or 4X of NEMA 250 or IP 56 of
IEC 60529 (both incorporated by reference; see 46 CFR 110.10–1) requirements;
(b) Have a switch handle that can be
maintained in the ‘‘on’’ position;
(c) Have the ‘‘off’’ and ‘‘on’’ positions
of the operating handle permanently
marked; and

(d) Have an inductive load rating not
less than the connected load or, on
large vessels, have auxiliary devices to
interrupt the load current.
[CGD 94–108, 61 FR 28288, June 4, 1996, as
amended at 62 FR 23910, May 1, 1997; USCG–
2003–16630, 73 FR 65201, Oct. 31, 2008]

§ 113.25–12 Alarm signals.
(a) Each general emergency alarm
signal must be an electrically-operated
bell, klaxon, or other warning device
capable of producing a signal or tone
distinct from any other audible signal
on the vessel.
(b) Electronic devices used to
produce the general emergency alarm
signal must meet the requirements of
subpart 113.50 of this part.
(c)(1) The minimum sound-pressure
levels for the emergency-alarm tone in
interior and exterior spaces must be a
sound level of not less than 80 dB(A)
measured at 10 feet on the axis; and
(2) At least 10 dB(A) measured at 10
feet on the axis, above the background
noise level when the vessel is underway
in moderate weather unless flashing
red lights are used in accordance with
46 CFR 113.25–10(b).
(d) Alarm signals intended for use in
sleeping compartments may have a
minimum sound level of 75 dB(A) measured 3 feet (1 meter) on axis, and at
least 10 dB(A) measured 3 feet (1 meter)
on axis, above ambient noise levels
with the ship under way in moderate
weather.
[CGD 94–108, 61 FR 28289, June 4, 1996, as
amended by USCG–2003–16300, 73 FR 65201,
Oct. 31, 2008]

§ 113.25–14 Electric cable and distribution fittings.
Each cable entrance to an emergency
alarm signal or distribution fitting
must be made watertight by a terminal
or stuffing tube.
§ 113.25–15 Distribution panels.
Each distribution panel must:
(a) Be watertight;
(b) Need a tool to be opened.
§ 113.25–16 Overcurrent protection.
(a) Each fuse in a general emergency
alarm system must meet the requirements of part 111, subpart 111.53, of this
chapter.

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Coast Guard, DHS

§ 113.27–1

(b) Each overcurrent protection device must cause as wide a differential
as possible between the rating of the
branch circuit overcurrent protection
device and that of the feeder overcurrent protection device.
(c) The capacity of the feeder overcurrent device must be as near practicable to 200 percent of the load supplied. The capacity of a branch circuit
overcurrent device must not be higher
than 50 percent of the capacity of the
feeder overcurrent device.
[CGD 94–108, 61 FR 28289, June 4, 1996]

§ 113.25–20 Marking of equipment.
(a) Each general emergency alarm
system fused switch and distribution
panel must have a fixed nameplate on
the outside of its cover that has a description of its function. The rating of
fuses must also be shown on the outside of the cover of a fused switch.
(b) Each general alarm contact
maker must be marked ‘‘GENERAL
ALARM’’ in red letters on a corrosionresistant plate or on a sign.
(c) A contact maker that operates
only the general emergency alarm signal in crew quarters, machinery spaces,
and work spaces must be marked
‘‘CREW ALARM’’ by the method described in paragraph (b) of this section.
(d) Each general emergency alarm
signal must be marked ‘‘GENERAL
ALARM—WHEN
EMERGENCY
ALARM SIGNAL RINGS GO TO YOUR
STATION’’ in red letters at least 1⁄2
inch high.
(e) Each general emergency alarm
system distribution panel must have a
directory attached to the inside of its
cover giving the designation of each
circuit, the area supplied by each circuit, and the rating of each circuit
fuse.

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[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by USCG–2004–18884, 69 FR 58348,
Sept. 30, 2004]

§ 113.25–25 General emergency alarm
systems for manned ocean and
coastwise barges.
A manned ocean or coastwise barge
of more than 100 gross tons, if it is one
that operates with the crew divided
into watches for steering the vessel,
must have an emergency alarm signal
installation. The system must:

(a) Have an automatically charged
battery as the power source;
(b) Have a manually operated contact
maker at the steering station and in
the crew accommodation area; and
(c) Must meet the requirements of
§ 113.25.7 and §§ 113.25–9 through 113.25–20
of this subpart.
§ 113.25–30 General emergency alarm
systems for barges of 300 or more
gross tons with sleeping accommodations for more than six persons.
The general emergency alarm system
for a barge of 300 or more gross tons
with sleeping accommodations for
more than six persons must meet the
requirements of Subpart 113.25, except
as follows:
(a) The number and location of contact makers must be determined by the
design, service, and operation of the
barge.
NOTE: Contact makers in the primary work
area, quarters area, galley and mess area,
machinery spaces, and the navigating bridge
or control area should be considered.

(b) If a distribution panel cannot be
above the uppermost continuous deck
because of the design of the barge and
is installed below the deck, it must be
as near the deck as practicable.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28289, June 4,
1996]

Subpart 113.27—Engineers’
Assistance-Needed Alarm
§ 113.27–1 Engineers’
ed alarm.

assistance-need-

Each self-propelled ocean, Great
Lakes, or coastwise vessel must have a
manually-operated engineers’ assistance-needed alarm that is:
(a) Operated from:
(1) The engine control room, if the
vessel has an engine control room; or
(2) The maneuvering platform, if the
vessel has no engine control room;
(b) Audible in the engineers’ accommodation spaces; and
(c) Powered from the general alarm
power source.

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§ 113.30–1

46 CFR Ch. I (10–1–11 Edition)

Subpart 113.30—Internal
Communications
§ 113.30–1

Applicability.

This subpart applies to each self-propelled vessel.
§ 113.30–3

Means of communications.

(a) An emergency means of communication required by this subpart
must—
(1) Be comprised of either fixed or
portable equipment; and
(2) Provide common talking means of
two-way voice communication and
calling among the navigating bridge,
emergency control stations, muster
stations, embarkation stations, and
other strategic positions listed in
§ 113.30–5.
(b) The means of communication and
calling must be a reliable means of
voice communication and must be
independent of the vessel’s electrical
system.
[CGD 94–108, 61 FR 28289, June 4, 1996, as
amended by USCG–2003–16630, 73 FR 65201,
Oct. 31, 2008]

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§ 113.30–5

Requirements.

(a) Communication. Each vessel must
have a means of communication among
the following:
(1) Navigating bridge.
(2) Steering gear room, if outside the
engineroom.
(3) Alternative steering station if
outside of the steering gear room.
(4) Engine control room, if the vessel
has an engine control room.
(5) Maneuvering platform, if the vessel has no engine control room.
(6) Control room, if the vessel is a
mobile offshore drilling unit.
(7) The engineering officers’ accommodations, if the vessel is an automated, self-propelled vessel under
§ 62.50–20(f) of this chapter.
(b) Gyrocompass. Each vessel that has
a master gyrocompass that is not in or
next to the navigating bridge must
have a means of communication between the master gyrocompass and the
navigating bridge repeater compass.
(c) Radar. Each vessel that has a
radar plan position indicator that is
not in or next to the navigating bridge
must have a means of communication

between the navigating bridge and the
radar plan position indicator.
(d) Emergency lockers. If the emergency equipment lockers or spaces used
by the emergency squad are not next to
the navigating bridge or, on a mobile
offshore drilling unit, next to the control room, there must be a means of
communication between the navigating bridge or control room and the
emergency
equipment
lockers
or
spaces.
(e) Radio and radio direction finder.
Communication to the radio and radio
direction finder must meet the following requirements:
(1) Each vessel that has a radio installation must have a means of communication between the radio room,
the navigating bridge, or, if the vessel
is a mobile offshore drilling unit, the
control room, and any other place from
which the vessel may be navigated
under normal conditions, other than a
place that is only for emergency functions, a place that is only for docking
or maneuvering, or a place that is for
navigating the vessel in close quarters.
A location that has the apparatus that
is necessary to steer the vessel, give
engine orders, and control the whistle,
is a place from which the vessel may be
navigated.
(2) If the operating position of the
emergency radio installation is not in
the compartment normally used for operating the main radio installation,
there must be means of communication
between the emergency radio room, the
navigating bridge, or, if the vessel is a
mobile offshore drilling unit, the control room, and any other place from
which the vessel may be navigated
under normal conditions; other than a
place that is only for emergency functions, a place that is only for docking
or maneuvering, or a place that is for
navigating the vessel in close quarters.
(3) Each vessel equipped with radio
direction-finding apparatus that is not
in or next to the navigating bridge
must have a means of communication
between the navigating bridge and the
direction-finding apparatus.
(4) The communication system required by this paragraph must be independent of all other systems on the
vessel. The location of the termination
of these systems is subject to approval

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Coast Guard, DHS

§ 113.30–25

by the Federal Communication Commission.
(f) Fire or smoke detecting systems.
Each vessel equipped with a fire or
smoke detecting system, if control
units are not in the navigating bridge,
must have means of communication
between the navigating bridge and the
stations where the control units are located.
(g) Lookout. Each vessel must have a
means of communication between the
navigating bridge and the bow or forward lookout station unless direct
voice communication is possible.
(h) Engineroom local control station.
Each self-propelled vessel equipped
with control from the navigating
bridge must have a means of communication between the local station for
the control of the speed or direction of
thrust of the propulsion machinery and
the engine control room, unless an engine order telegraph is installed in accordance with § 113.35–3. Each communication station at a local control station must—
(1) Be on a circuit separate from any
other station required by this section;
and
(2) Provide the capability of reliable
voice communication when the vessel
is underway.
(i) Mobile offshore drilling units. Each
non-self-propelled
mobile
offshore
drilling unit must have a means of
communication among the control
room, drill floor, machinery space, and
silicon controlled rectifier (SCR) room
(if installed). Each column-stabilized
mobile offshore drilling unit must have
a means of communication between the
ballast control room and the spaces
that contain the ballast pumps and
valves.

wreier-aviles on DSK3TPTVN1PROD with CFR

[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28289, June 4,
1996; 62 FR 23910, May 1, 1997; USCG–2004–
18884, 69 FR 58348, Sept. 30, 2004]

§ 113.30–20 General requirements.
(a) The communications stations listed in § 113.30–5(a) through (d), (f), (g),
and (i) and other communications stations for the operation of the vessel,
such as the captain’s and chief engineer’s offices and staterooms, emergency power room, carbon dioxide (or
other extinguishing agent) control

room, and firepump room, must not be
on the same circuit as communications
stations installed to meet the requirements of §§ 113.30–5(e) and 113.30–5(h).
(b) If a communications station is in
the weather and on the same circuit as
other required stations, there must be
a cut-out switch on the navigating
bridge that can isolate this station
from the rest of the stations, unless
the system possesses other effective
means of station isolation during a
fault condition.
(c) No jack-box or headset may be on
a communication system that includes
any station required by this subpart,
except for a station installed to meet
46 CFR 113.30–5(h) or 46 CFR 113.30–25(f).
[CGD 94–108, 61 FR 28289, June 4, 1996, as
amended by USCG–2003–16630, 73 FR 65201,
Oct. 31, 2008]

§ 113.30–25

Detailed requirements.

(a) Multiple stations must be able to
communicate at the same time.
(b) The loss of one component of the
system must not disable the rest of the
system.
(c) The system must be able to operate under full load for the same period
of operation as required for the emergency generator. See 46 CFR 112.05–5,
Table 112.05–5(a).
(d) Each voice-communication station device in the weather must be in a
proper enclosure as required in 46 CFR
111.01–9. The audible-signal device must
be outside the station enclosure.
(e) Each station in a navigating
bridge or a machinery space must be in
an enclosure meeting at least Type 2 of
NEMA 250 or IP 22 of IEC 60529 (both incorporated by reference; see 46 CFR
110.10–1).
(f) In a noisy location, such as an engine room, there must be a booth or
other equipment to permit reliable
voice communication while the vessel
is operating.
(g) In a space throughout which the
voice communication station audiblesignal device cannot be heard, there
must be another audible-signal device
or a visual-device, such as a light, either of which is energized from the
final emergency bus.
(h) If two or more voice communication stations are near each other, there

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§ 113.35–1

46 CFR Ch. I (10–1–11 Edition)

must be a means that indicates the station called.
(i) Each connection box must meet at
least Type 4 or 4X of NEMA 250 or IP 56
of IEC 60529.
(j) Voice communication cables must
run as close to the fore-and-aft centerline of the vessel as practicable.
(l) No cable for voice communication
may run through any space at high
risk of fire such as machinery rooms
and galleys, unless it is technically impracticable to route it otherwise or it
must serve circuits within those
spaces.
(2) Each cable running through any
space at high risk of fire must meet
IEC 60331–11 and IEC 60331–21 (both incorporated by reference; see 46 CFR
110.10–1).
(k) If the communications system
uses a sound-powered telephone, the
following requirements also apply:
(1) Each station except one regulated
by paragraph (d) of this section must
include a permanently wired handset
with a push-to-talk button and a hanger for the handset.
(2) The hanger must be constructed
so that it holds the handset away from
the bulkhead and so that the motion of
the vessel will not dislodge the
handset.
(3) Each talking circuit must be electrically independent of each calling
circuit.
(4) No short circuit, open circuit, or
ground on either side of a calling circuit may affect a talking circuit.
(5) Each circuit must be insulated
from ground.
[USCG–2003–16630, 73 FR 65201, Oct. 31, 2008]

Subpart 113.35—Engine Order
Telegraph Systems

wreier-aviles on DSK3TPTVN1PROD with CFR

§ 113.35–1

Definitions.

As used in this subpart:
(a) Indicator means an instrument in
the engine room to receive and acknowledge engine orders; and
(b) Transmitter means an instrument
to
send
engine
orders
to
the
engineroom and receive acknowledgement from the engineroom.

§ 113.35–3 General requirements.
(a) Each self-propelled vessel, except
as provided in paragraph (d) of this section, must have an electric or mechanical engine order telegraph system
from the navigating bridge to the
engineroom.
(b) On a vessel with more than one
propulsion engine, each engine must
have this system.
(c) On a double-ended vessel that has
two navigating bridges, this system
must be between the engineroom and
each navigating bridge.
(d) If a small vessel has no engine
order telegraph system between the
navigating bridge and the engineroom,
the propulsion plant must be controlled entirely from the navigating
bridge, with no means of normal engine
control from the engineroom.
(e) On vessels equipped with pilothouse control, each local control station in the engineroom must have an
indicator if:
(1) Manual operation from the local
control station is an alternative means
of control; and
(2) The local control station is not
immediately
adjacent
to
the
engineroom control station; and
(3) Reliable voice communication and
calling that meets the requirements of
§ 113.30–5(h) is not provided.
(f) Engine order telegraph and remote
propulsion control systems must be
electrically separate and independent,
except that a single mechanical operator control device with separate
transmitters and connections for each
system may be used.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 81–030, 53 FR 17847, May 18,
1988; CGD 94–108, 61 FR 28290, June 4, 1996]

§ 113.35–5 Electric engine order telegraph systems.
(a) Each electric engine order telegraph system must have transmitters
and indicators that are electrically
connected to each other.
(b) Each engineroom indicator must
be capable of acknowledgment of orders.
(c) There must be an audible signal
at each instrument. The signal at both
locations must sound continuously
when the transmitter and the indicator
do not show the same order.

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Coast Guard, DHS

§ 113.35–17

(d) Each telegraph instrument must
meet the protection requirements of
§ 111.01–9 of this chapter.
(e) Each system must have an alarm
which—
(1) Automatically sounds and visually signals a loss of power to the system;
(2) Is on the navigating bridge; and
(3) Has a means to reduce the audible
signal from 100 percent to not less than
50 percent.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28290, June 4,
1996]

wreier-aviles on DSK3TPTVN1PROD with CFR

§ 113.35–7 Electric engine order telegraph systems; operations.
(a) Where two or more transmitters,
located on or on top of, or on the wings
of, the navigating bridge operate a
common indicator in the engineroom,
the transmitters must:
(1) Operate in synchronism as required in paragraph (b) of this section;
or
(2) Operate under the control of a
transmitter transfer control in accordance with paragraph (c) of this section.
(b) All transmitter handles and
pointers must operate in synchronism.
Where the transmitters are mechanically interlocked to effect synchronous
operation, the requirements of § 113.35–
13 must be met.
(c) Except for a transmitter in an unattended navigating bridge on a double-ended vessel, each transmitter
must operate under the control of a
transmitter transfer control so that
movement of any one transmitter handle automatically connects that transmitter electrically to the engineroom
indicator and simultaneously disconnects electrically all other transmitters. The reply pointers of all transmitters must operate in synchronism
at all times.
(d) On a double-ended vessel that has
two navigating bridges, a manually operated transfer switch which will disconnect the system in the unattended
navigating bridge must be provided.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982. Redesignated and amended by CGD 94–108, 61 FR
28290, June 4, 1996]

§ 113.35–9 Mechanical
telegraph systems.

engine

(a) Each mechanical engine order
telegraph system must consist of
transmitters and indicators mechanically connected to each other, as by
means of chains and wires.
(b) Each transmitter and each indicator must have an audible signal device to indicate, in the case of an indicator, the receipt of an order, and in
the case of a transmitter, the acknowledgment of an order. The audible signal
device must not be dependent upon any
source of power for operation other
than that of the movement of the
transmitter or indicator handle.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28290, June 4,
1996]

§ 113.35–13 Mechanical engine order
telegraph systems; operation.
If more than one transmitter operates a common indicator in the
engineroom, all the transmitters must
be mechanically interlocked and operate in synchronism. A failure of the
transmission wire or chain at any
transmitter must not interrupt or disable any other transmitter.
§ 113.35–15 Mechanical engine order
telegraph systems; application.
If a mechanical engine order telegraph system is installed on any vessel
to provide the communication required
by this subpart, the length of cables or
other mechanical limitations must not
prevent the efficient operation of the
system.
§ 113.35–17 Vessels
bridge control.

with

navigating

Each vessel with navigating bridge
throttle control must have a positive
mechanical stop on each telegraph
transmitter that prevents movement
to the ‘‘Navigating Bridge Control’’ position without positive action by the
operator.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28290, June 4,
1996]

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§ 113.37–1

46 CFR Ch. I (10–1–11 Edition)

Subpart 113.37—Shaft Speed and
Thrust Indicators
§ 113.37–1

§ 113.40–10

Applicability.

This subpart applies to all self-propelled vessels.
§ 113.37–5

General requirements.

(a) A vessel equipped with fixed pitch
propellers must have on the navigating
bridge and at the engineroom control
station a propeller speed and direction
indicator for each shaft.
(b) A vessel equipped with controllable pitch propellers must have on the
navigating
bridge
and
at
the
engineroom control station a propeller
speed and pitch position indicator for
each shaft.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28290, June 4,
1996]

§ 113.37–10

Detailed requirements.

(a) Each indicator must be independent of the propulsion control system. A failure of the propulsion control
system must not affect the operation
of the indicators.
(b) Each electric component or its
enclosure must meet Type 4 or 4X of
NEMA 250 or IP 56 of IEC 60529 (both incorporated by reference; see 46 CFR
110.10–1) requirements.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28290, June 4,
1996; USCG–2003–16630, 73 FR 65202, Oct. 31,
2008]

Subpart 113.40—Rudder Angle
Indicator Systems
§ 113.40–1

Applicability.

This subpart applies to self-propelled
vessels.

wreier-aviles on DSK3TPTVN1PROD with CFR

§ 113.40–5

General requirements.

The position of the rudder, if poweroperated, must be shown at the principal steering station. If there is nonfollow-up steering control at the alternative steering station, there must be
a separate rudder angle indicator system for that station that is electrically
independent from each other rudder
angle indicator system.

Detailed requirements.

(a) Each rudder angle indicator system must have a transmitter at the
rudder head that is actuated by movement of the rudder with the angular
movements of the rudder transmitted
to a remote indicator or indicators.
This system must be independent of all
other systems and not receive power or
signal from the steering gear control,
autopilot, or dynamic positioning systems. However, the indicator may be
physically located on a control console,
such as an integrated bridge system, if
it is readily visible by the helmsman at
the steering stand.
(b) Each electric component or its
enclosure must meet Type 4 or 4X of
NEMA 250 or IP 56 of IEC 60529 (both incorporated by reference; see 46 CFR
110.10–1) requirements.
[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28290, June 4,
1996; 62 FR 23910, May 1, 1997; USCG–2003–
16630, 73 FR 65202, Oct. 31, 2008]

Subpart 113.43—Steering Failure
Alarm Systems
§ 113.43–1

Applicability.

This subpart applies to each vessel of
1600 gross tons and over that has power
driven main or auxiliary steering gear.
§ 113.43–3

Alarm system.

(a) Each vessel must have a steering
failure alarm system that actuates an
audible and visible alarm in the pilothouse when the actual position of the
rudder differs by more than 5 degrees
from the rudder position ordered by the
followup control systems, required by
part 58, subpart 58.25, of this chapter,
for more than:
(1) 30 seconds for ordered rudder position changes of 70 degrees;
(2) 6.5 seconds for ordered rudder position changes of 5 degrees; and
(3) The time period calculated by the
following formula for ordered rudder
positions changes between 5 degrees
and 70 degrees:
t = (R/2.76)+4.64
Where
t = maximum time delay in seconds
R = ordered rudder change in degrees

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Coast Guard, DHS

§ 113.50–5

(b) The alarm system must be separate from, and independent of, each
steering gear control system, except
for input received from the steering
wheel shaft.

alarm system
§ 113.25–1.

[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 62 FR 23910, May 1,
1997; USCG–2004–18884, 69 FR 58348, Sept. 30,
2004]

(a) Each vessel must have an amplifier-type announcing system that will
supplement the general emergency
alarm. This system must provide for
the transmission of orders and information throughout the vessel by means
of microphones and loudspeakers connected through an amplifier. If a decentralized-type system is used, its
overall performance must not be affected by the failure of a single call
station. This system may be combined
with the general emergency alarm and
fire detecting and alarm systems. The
public address system must be protected against unauthorized use.
(b) The announcing station must be
located adjacent to the general emergency alarm contact maker on the
navigating bridge.
(c) There must be a means to silence
all other audio distribution systems at
the announcing station.
(d) The system may be arranged to
allow broadcasting separately to, or to
any combination of, various areas on
the vessel. If the amplifier system is
used for the general emergency alarm
required by subpart 113.25 of this part,
the operation of a general emergency
alarm contact maker must activate all
speakers in the system, except that a
separate crew alarm may be used as allowed by § 113.25–5(e)(2).
(e) The amplifier, and any device
used to produce the general emergency
alarm signal, must be provided in duplicate.
(f) The power supply must be in accordance with the requirements of
§§ 113.25–6 and 113.25–7.
(g) Each electrical subsystem in a
weather location must be watertight or
in a watertight enclosure and must
meet Type 4 or 4X of NEMA 250 or IP 56
of IEC 60529 (both incorporated by reference; see 46 CFR 110.10–1) requirements.

§ 113.43–5

Power supply.

Each steering failure alarm system
must be supplied by a circuit that:
(a) Is independent of other steering
gear system and steering alarm circuits;
(b) Is fed from the final emergency
power source through the emergency
distribution panel in the wheelhouse, if
installed; and
(c) Has no overcurrent protection except short-circuit protection by an instantaneous fuse or circuit breaker
rated or set at 400 to 500 percent of:
(1) The current-carrying capacity of
the smallest alarm system interconnecting conductors; or
(2) The normal load of the system.

Subpart 113.45—Refrigerated
Spaces Alarm Systems
§ 113.45–5

General requirements.

wreier-aviles on DSK3TPTVN1PROD with CFR

(a) Each refrigerated space that is accessible to the vessel’s personnel and
that can be locked from the outside so
that it cannot be opened from the inside, must have an audible alarm system that can be operated from within
the refrigerated space.
(b) The alarm activator must be in
the refrigerated space at its exit.
(c) The audible signal must sound at
a manned location.
(d) If there is a common audible signal for more than one lockable refrigerated space, there must be an annunciator for locating the space from
which the signal was initiated.

Subpart 113.50—Public Address
Systems
§ 113.50–1

Applicability.

This subpart applies to each vessel
required to have a general emergency

in

accordance

[CGD 94–108, 61 FR 28290, June 4, 1996]

§ 113.50–5

General requirements.

[CGD 94–108, 61 FR 28290, June 4, 1996, as
amended at 62 FR 23910, May 1, 1997; USCG–
2003–16630, 73 FR 65202, Oct. 31, 2008]

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§ 113.50–10

46 CFR Ch. I (10–1–11 Edition)

§ 113.50–10 Additional
requirements
for passenger vessels.
Each passenger vessel must have a
public address system capable of broadcasting separately or collectively to
the following stations:
(a) Survival craft stations, port.
(b) Survival craft stations, starboard.
(c) Survival craft embarkation stations, port.
(d) Survival craft embarkation stations, starboard.
(e) Public spaces used for passenger
assembly points.
(f) Crew quarters.
(g) Accommodation spaces and service spaces.
[CGD 94–108, 61 FR 28290, June 4, 1996]

§ 113.50–15 Loudspeakers.
(a) Loudspeakers must be located to
eliminate feedback or other interference which would degrade communication.
(b) Loudspeakers must be located to
provide intelligible and audible oneway communication throughout the
vessel. Weatherdeck loudspeakers must
be watertight and suitably protected
from the effects of the wind and seas.
(c) There must be a sufficient number
of loudspeakers throughout the vessel.
The public address system must be installed with regard to acoustically
marginal conditions and not require
any action from the addressee. With
the vessel underway in normal conditions, the minimum sound pressure levels for broadcasting emergency announcements must be—
(1) In interior spaces, 75 dB(A) or, if
the background noise level exceeds 75
dB(A), then at least 20 dB(A) above
maximum background noise level; and
(2) In exterior spaces, 80 dB(A) or, if
the background noise level exceeds 80
dB(A), then at least 15 dB(A) above
maximum background noise level.
(d) Loudspeakers must not have external volume controls or local cutout
switches.

wreier-aviles on DSK3TPTVN1PROD with CFR

[CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as
amended by CGD 94–108, 61 FR 28291, June 4,
1996; 61 FR 36787, July 12, 1996]

§ 113.50–20

Distribution of cable runs.

(a) Each system must have a feeder
distribution panel to divide the system
into the necessary number of zone feeders. Where, because of the arrangement
of the vessel, only one zone feeder is
necessary, a branch circuit distribution
panel must be used.
(b) The feeder distribution panel
must be in an enclosed space next to
the public address system power supply.
(c) Each system must have at least
one feeder for each vertical fire zone.
(d) Each system must have one or
more branch circuit distribution panels
for each zone feeder, with at least one
branch circuit for each deck level. The
distribution panel must be above the
uppermost continuous deck, in the
zone served, and there must be no disconnect switches for the branch circuits.
(e) A branch circuit must not supply
speakers on more than one deck level,
except for a single branch circuit supplying all levels of a single space if all
other requirements of this section are
met.
(f) On a vessel not divided into
vertical fire zones by main vertical fire
bulkheads, the vessel must be divided
into vertical zones not more than 40
meters (131 feet) long. There must be a
feeder for each of these zones.
(g) Feeders and branch circuit cables
must be in passageways. They must not
be in staterooms, lockers, galleys, or
machinery spaces, unless it is necessary to supply public address speakers in those spaces.
[CGD 94–108, 61 FR 28291, June 4, 1996]

Subpart 113.65—Whistle Operators
§ 113.65–5

General requirements.

Each whistle operator must meet section 21.5 of IEEE Std 45–2002 (incorporated by reference; see 46 CFR 110.10–
1).
[USCG–2003–16630, 73 FR 65202, Oct. 31, 2008]

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