3 Emergency source of electrical power (R 42)
NEW CLASS B, C AND D AND EXISTING CLASS B SHIPS:
.1Every ship shall be provided with a self-contained emergency source of electrical power with emergency switchboard located above the bulkhead deck, in a readily accessible space which shall not be contiguous to the boundaries of machinery spaces of category A or of those spaces containing the main source of electrical power or main switchboard.
.2The emergency source of electric power may be either an accumulator battery capable of complying with the requirements of paragraph .5, without being recharged or suffering an excessive voltage drop, or a generator, capable of complying with the requirements of paragraph .5, driven by internal combustion type of machinery with an independent supply of fuel having a flashpoint of not less than 43 °C, with automatic starting arrangements for new ships and approved starting arrangements for existing ships, and provided with a transitional source of emergency electrical power according to paragraph .6, unless, in the case of new class C and D ships of less than 24 metres in length a suitably located independent battery arrangement is provided for that particular consumer for the period of time required for these regulations.
.3The emergency source of electric power shall be so arranged that it will operate efficiently when the ship is listed to 22,5 ° and when the trim of the ship is 10 ° from an even keel. Emergency generator set(s) shall be capable of being readily started in any cold condition likely to be encountered and, in new ships, capable of being started automatically.
.4The emergency switchboard shall be situated as near as practicable to the emergency source of power.
.5The emergency source of power required by paragraph .1 shall:
be capable of operating in general for a period of:
12 hours for class B ships (new and existing)
6 hours for class C ships (new)
3 hours for class D ships (new);
in particular, be capable to operate simultaneously the consumers as identified within the following services as required for the class of ships for the times indicated above:
the ship's emergency bilge pump and one of the fire pumps;
emergency lighting:
at every assembly or embarkation station and over the sides;
in all alleyways, stairways and exits giving access to the assembly or embarkation stations;
in the machinery spaces, and in the place where the emergency generator is situated;
in the control stations where radio and main navigating equipment are situated;
as required in Regulations II-2/B/16.1.3.7 and II-2/B/6.1.7;
at all stowage positions for firefighters' outfits;
at the emergency bilge pump and one of the fire pumps, referred to in subparagraph (a), and at the starting position of their motors;
the ship's navigation lights;
all communication equipment,
the general alarm system,
the fire detecting system, and
all signals which may be required in an emergency, if they are electrically operated from the ship's main generating sets;
the ship's sprinkler pump, if any and if it is electrically operated; and
the ship's daylight signalling lamp, if it is operated by the ship's main source of electric power;
be capable to operate, for a period of half an hour, the power-operated watertight doors together with the associated control, indication and alarm circuits.
.6The transitional source of emergency electrical power required by paragraph .2 shall consist of an accumulator battery suitably located for the use in an emergency which shall operate without recharging or suffering an excessive voltage drop for half an hour:
the lighting required by paragraph .2(b)1 of this regulation;
the watertight doors, as required by paragraphs .7.2 and .7.3 of Regulation II-1/B/13, but not necessarily all of them simultaneously, unless an independent temporary source of stored energy is provided; and
the control, indication and alarm circuits as required by paragraph .7.2 of Regulation II-1/B/13.
.7CLASS B, C AND D SHIPS CONSTRUCTED ON OR AFTER 1 JANUARY 2003:
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 minutes after blackout.