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1. Every cargo ship of Group 4 shall be provided with a self-contained emergency source of electrical power;
2. 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 shall be located above the upper-most continuous deck and shall be readily accessible from an open deck; they shall not be forward of the collision bulkhead;
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(s) of electrical power, associated transforming equipment, if any, and the main switchboard shall be such that a fire or other casualty in the space containing the main source(s) of electrical power, the 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 power; as far as practicable the space containing the emergency sources of power, the associated transforming equipment, if any, the transitional source of emergency 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(s) of electrical power, associated transforming equipment, if any, and the main switchboard; and
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.

1. for a period of 3 hours, emergency lighting at every muster and embarkation station on deck and over sides;
2. for a period of 18 hours, emergency lighting:
1. in all service and accommodation alleyways, stairways and exits, personnel elevators and personnel elevator trunks;
2. in the machinery spaces and main generating stations including their control positions;
3. in all control stations, radio rooms/stations, machinery control rooms and at each main and emergency switchboard;
4. at the stowage position(s) for firemen's outfits;
5. at the steering gear;
6. at the sprinkler pump if any, at the fire pump referred to in paragraph S1.5.2 (e) of this subsection, at the emergency bilge pump if any, and at their starting positions; and
7. navigating bridge and chart room;
3. for a period of 18 hours:
1. the alternate system of navigation lights and other lights required by the Collision Regulations; and
2. the VHF, MF, MF/HF radio installations and the ship earth station required by the Ship Station Radio Regulations;
4. for a period of 18 hours:
1. all internal communication equipment that is required in an emergency;
2. shipborne navigational equipment as required by the Navigating Appliances and Equipment Regulations;
3. fire detection and its alarm systems; and
4. intermittent operation of the daylight signalling lamp, the ship's whistle, the general alarm, the manual fire alarms, and all internal signals that are required in an emergency;
unless, in respect of (i) (ii) (iii) and (iv) above, they have an independent supply from an accumulator battery suitably located for use in an emergency and sufficient for the period of 18 hours.
5. for a period of 18 hours one of the fire pumps required by Regulation 4 of Chapter II-2 of the International Convention for the Safety of Life at Sea, 1974 if dependent upon the emergency generator for its source of power; and
6. the operation of the steering gear for a period of time required by Schedule VII of the Marine Machinery regulations.

1. in no case is it less than 12 hours;
2. the level of safety is maintained and;
3. information in respect of the vessel, its voyage, and the life saving and fire fighting equipment it carries is submitted to the Board for inspection.

1. where the emergency source of power is a generator it shall be:
1. driven by a suitable prime mover with an independent supply of fuel, having a flashpoint of not less than 43°C and equipped with a starting arrangement as per Part 1 Section 1 (1.6 to 1.10) of this standard;
2. started automatically upon failure of the normal electrical supply unless a transitional source of emergency power in accordance with (iii) hereafter is provided; where the emergency generator is automatically started, it shall be automatically connected to the emergency switchboard; those services referred to in subsection S1.5.5 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
3. provided with a transitional source of emergency power as specified in subsection S1.5.5 unless there is provided an emergency generator capable of supplying the services mentioned in subsection S1.5.5 and which is capable of being automatically started and supplying the required load as quickly as is safe and practicable but in not more than 45 seconds; and
2. where the emergency source of power is an accumulator battery it shall be capable of:
1. carrying the emergency load without recharging whilst maintaining the voltage of the battery throughout the discharge period within plus or minus 12 per cent of its nominal voltage;
2. automatically connecting to the emergency switchboard in the event of failure of the main power supply; and
3. immediately supplying at least those services specified in subsection (5).

1. the lighting required by paragraphs S1.5.2 (a), (b) and (c); for this transitional phase, the required emergency lighting, in respect of the machinery space and accommodation and service areas, may be provided by permanently fixed, individual, automatically charged, relay operated battery lamps;
2. all essential internal communication equipment, fire detection and its alarm equipment required by sub-paragraph S1.5.2 (d) (i); and
3. intermittent operation of the services referred to in sub-paragraph S1.5.2 (d) (iv);

1. the emergency switchboard shall be installed as near as is practicable to the emergency source of power;
2. where the emergency source of 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;
3. no accumulator battery fitted in accordance with this Standard 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 power or the transitional source of power referred to in subsections S1.5.4 or S1.5.5 are being discharged;
4. the emergency switchboard is to be supplied in normal operation from the main switchboard by an inter-connector feeder which is to be adequately protected at the main switchboard against overload and short circuit; the arrangement at the emergency switchboard shall be such that the interconnector feeder is disconnected automatically at the emergency switchboard upon failure of the main power supply; 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; and
5. in order to ensure ready availability of emergency supplies, arrangements shall be made where necessary to disconnect automatically non-emergency circuits from the emergency switchboard to ensure that power shall be available automatically to the emergency circuits.

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