1.1 A self-contained emergency source of electrical
power shall be provided.
1.2 The emergency source of electrical power,
associated transforming equipment, if any, transitional source of
emergency power, emergency switchboard and emergency lighting switchboard
shall be located above the uppermost continuous deck and shall be
readily accessible from the open deck. They shall not be located forward
of the collision bulkhead, except where permitted by the Administration
in exceptional circumstances.
1.3 The location of the emergency source of electrical
power, associated transforming equipment, if any, the transitional
source of emergency power, the emergency switchboard and the emergency
lighting switchboard in relation to the main source of electrical
power, associated transforming equipment, if any, and the main switchboard
shall be such as to ensure to the satisfaction of the Administration
that a fire or other casualty in the space containing the main source
of electrical power, associated transforming equipment, if any, and
the main switchboard, or in any machinery space of category A will
not interfere with the supply, control and distribution of emergency
electrical power. As far as practicable the space containing the emergency
source of electrical power, associated transforming equipment, if
any, the transitional source of emergency electrical power and the
emergency switchboard shall not be contiguous to the boundaries of
machinery spaces of category A or those spaces containing the main
source of electrical power, associated transforming equipment, if
any, and the main switchboard.
1.4 Provided that suitable measures are taken
for safeguarding independent emergency operation under all circumstances,
the emergency generator may be used, exceptionally, and for short
periods, to supply non-emergency circuits.
2 The electrical power available shall be sufficient
to supply all those services that are essential for safety in an emergency,
due regard being paid to such services as may have to be operated
simultaneously. The emergency source of electrical power shall be
capable, having regard to starting currents and the transitory nature
of certain loads, of supplying simultaneously at least the following
services for the periods specified hereinafter, if they depend upon
an electrical source for their operation:
2.1 For a period of 3 h, emergency lighting at
every muster and embarkation station and over the sides as required
by regulations III/11.4 and III/16.7.
2.2 For a period of 18 h, emergency lighting:
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.1 in all service and accommodation alleyways,
stairways and exits, personnel lift cars and personnel lift trunks;
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.2 in the machinery spaces and main generating
stations including their control positions;
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.3 in all control stations, machinery control
rooms, and at each main and emergency switchboard;
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.4 at all stowage positions for firemen's outfits;
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.5 at the steering gear;
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.6 at the fire pump referred to in paragraph 2.5,
at the sprinkler pump, if any, and at the emergency bilge pump, if
any, and at the starting positions of their motors; and
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.7 in all cargo pump-rooms of tankers constructed
on or after 1 July 2002
2.3 For a period of 18 h:
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.1 the navigation lights and other lights required
by the International Regulations for Preventing Collisions at Sea
in force;
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.2 on ships constructed on or after 1 February
1995 the VHF radio installation required by regulation
IV/7.1.1 and IV/7.1.2 ; and, if applicable:
2.4 For a period of 18 h:
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.1 all internal communication equipment as required
in an emergency;
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.2 the shipborne navigational equipment as required
by regulation V/12
footnote; where such provision is unreasonable or impracticable
the Administration may waive this requirement for ships of less than
5,000 gross tonnage;
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.3 the fire detection and fire alarm system; and
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.4 intermittent operation of the daylight signalling
lamp, the ship's whistle, the manually operated call points and all
internal signals that are required in an emergency;
unless such services have an independent supply for the period
of 18 h from an accumulator battery suitably located for use in an
emergency.
2.6.1 For the period of time required by regulation 29.14 the steering gear
where it is required to be so supplied by that regulation.
2.6.2 In a ship engaged regularly in voyages of
short duration, the Administration if satisfied that an adequate standard
of safety would be attained may accept a lesser period than the 18
h period specified in paragraphs 2.2 to 2.5 but not less than 12 h.
3 The emergency source of electrical power may
be either a generator or an accumulator battery, which shall comply
with the following:
3.1 Where the emergency source of electrical power
is a generator, it shall be:
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.1 driven by a suitable prime mover with an independent
supply of fuel, having a flashpoint (closed cup test) of not less
than 43°C;
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.2 started automatically upon failure of the main
source of electrical power supply unless a transitional source of
emergency electrical power in accordance with paragraph 3.1.3 is provided;
where the emergency generator is automatically started, it shall be
automatically connected to the emergency switchboard; those services
referred to in paragraph 4 shall then be connected automatically to
the emergency generator; and unless a second independent means of
starting the emergency generator is provided the single source of
stored energy shall be protected to preclude its complete depletion
by the automatic starting system; and
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.3 provided with a transitional source of emergency
electrical power as specified in paragraph 4 unless an emergency generator
is provided capable both of supplying the services mentioned in that
paragraph and of being automatically started and supplying the required
load as quickly as is safe and practicable subject to a maximum of
45 s.
3.2 Where the emergency source of electrical power
is an accumulator battery it shall be capable of:
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.1 carrying the emergency electrical load without
recharging while maintaining the voltage of the battery throughout
the discharge period within 12% above or below its nominal voltage;
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.2 automatically connecting to the emergency switchboard
in the event of failure of the main source of electrical power; and
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.3 immediately supplying at least those services
specified in paragraph 4.
3.3 The following provision in paragraph 3.1.2
shall not apply to ships constructed on or after 1 October 1994:
Unless a second independent means of starting the emergency
generating set is provided, the single source of stored energy shall
be protected to preclude its complete depletion by the automatic starting
system.
3.4 For ships constructed on or after 1 July 1998,
where electrical power is necessary to restore propulsion, the capacity
shall be sufficient to restore propulsion to the ship in conjunction
with other machinery, as appropriate, from a dead ship condition within
30 min after blackout.
4 The transitional source of emergency electrical
power where required by paragraph 3.1.3 shall consist of an accumulator
battery suitably located for use in an emergency which shall operate
without recharging while maintaining the voltage of the battery throughout
the discharge period within 12% above or below its nominal voltage
and be of sufficient capacity and shall be so arranged as to supply
automatically in the event of failure of either the main or the emergency
source of electrical power for half an hour at least the following
services if they depend upon an electrical source for their operation:
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.1 the lighting required by paragraphs 2.1, 2.2
and 2.3.1. For this transitional phase, the required emergency electric
lighting, in respect of the machinery space and accommodation and
service spaces may be provided by permanently fixed, individual, automatically
charged, relay operated accumulator lamps; and
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.2 all services required by paragraphs 2.4.1,
2.4.3 and 2.4.4 unless such services have an independent supply for
the period specified from an accumulator battery suitably located
for use in an emergency.
5.1 The emergency switchboard shall be installed
as near as is practicable to the emergency source of electrical power.
5.2 Where the emergency source of electrical power
is a generator, the emergency switchboard shall be located in the
same space unless the operation of the emergency switchboard would
thereby be impaired.
5.3 No accumulator battery fitted in accordance
with this regulation shall be installed in the same space as the emergency
switchboard. An indicator shall be mounted in a suitable place on
the main switchboard or in the machinery control room to indicate
when the batteries constituting either the emergency source of electrical
power or the transitional source of electrical power referred to in
paragraph 3.2 or 4 are being discharged.
5.4 The emergency switchboard shall be supplied
during normal operation from the main switchboard by an interconnector
feeder which is to be adequately protected at the main switchboard
against overload and short circuit and which is to be disconnected
automatically at the emergency switchboard upon failure of the main
source of electrical power. Where the system is arranged for feedback
operation, the interconnector feeder is also to be protected at the
emergency switchboard at least against short circuit.
5.5 In order to ensure ready availability of the
emergency source of electrical power, arrangements shall be made where
necessary to disconnect automatically non-emergency circuits from
the emergency switchboard to ensure that electrical power shall be
available automatically to the emergency circuits.
6 The emergency generator and its prime mover
and any emergency accumulator battery shall be so designed and arranged
as to ensure that they will function at full rated power when the
ship is upright and when inclined at any angle of list up to 22.5°
or when inclined up to 10° either in the fore or aft direction,
or is in any combination of angles within those limits.
7 Provision shall be made for the periodic testing
of the complete emergency system and shall include the testing of
automatic starting arrangements.