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39. Sounding pipes
In every ship to which Part II applies all tanks forming part of the structure of the ship and all watertight compartments, not being part of the machinery space, shall be provided with efficient sounding arrangements which shall be protected where necessary against damage. Where such arrangements consist of sounding pipes, a thick steel doubling plate shall be securely fixed below each sounding pipe for the sounding rod to strike upon. All such sounding pipes shall extend to positions above the ship’s bulkhead deck which shall at all times be readily accessible. Sounding pipes for bilges, cofferdams and double bottom tanks, being bilges, cofferdams and tanks situated in the machinery space, shall so extend unless the upper ends of the pipes are accessible in ordinary circumstances and are furnished with cocks having parallel plugs with permanently secured handles so loaded that on being released they automatically close the cocks. Sounding pipes for the bilges of insulated holds shall be insulated and not less than 63 millimetres in diameter.

40. Application of Part IV
This Part applies to every new passenger ship to which these regulations apply.

41. General
(1) In every ship to which this Part applies the electrical equipment and installations, other than the electrical means of propulsion, if any, shall be such that the electrically operated services essential for the safety of the ship and of persons on board can be maintained under emergency conditions.
(2) In every ship to which this Part applies, the electrical equipment and installations, including any electrical means of propulsion, shall be such that the ship and all persons on board are protected against electrical hazards. The electrical equipment and installations shall comply with the requirements specified in Merchant Shipping Notice No. M932 (U.K.) and shall include a reference to any document amending these requirements which is considered by the Director to be relevant from time to time and is specified in a Merchant Shipping Notice issued in Hong Kong.

42. Main generating sets
(1) Every ship, being a ship in which electrical power is the only power for maintaining the auxiliary services essential for the propulsion or safety of the ship, shall be provided with 2 or more main generating sets of such power that the aforesaid services can be operated when any one of the sets is out of service. Arrangements shall be made which will safeguard such sets from being rendered inoperative in the event of the partial flooding of the ship’s machinery space through leakage from a damaged compartment or otherwise.
(2) In every such ship where there is only one main generating station, such main generating station and the main switchboard shall be situated in the same main fire zone. Where there is more than one main generating station, and only one main switchboard, such switchboard shall be situated in the same main fire zone as one of the generating stations.

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44. No provision.

45. Emergency switchboards
In every ship of Class I, Class II or Class II(A) in which the provision of an emergency source of electric power is required by these regulations—
(a) the emergency switchboard shall be situated as near as practicable to the emergency source of power;
(b) if the emergency source of power is a generator, the emergency switchboard shall be situated in the same space as the generator unless the operation of the switchboard would thereby be impaired;
(c) if the emergency source of power is a generator, an inter-connecting feeder, adequately protected at each end, connecting the main and emergency switchboards shall be fitted; and
(d) no accumulator (storage) battery fitted in accordance with regulation 43 shall be situated in the same space as the emergency switchboard.

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46. Distribution systems
(1) In every ship to which this Part applies every main and emergency switchboard shall be so arranged as to give easy access to the back and the front thereof without danger to any person and shall be suitably guarded. A non-conducting mat or grating shall be provided at the back and front where necessary. No exposed parts which may have a voltage between conductors or to earth exceeding 250 volts direct current or 55 volts alternating current shall be installed on the face of any switchboard or control panel.
(2) Hull return shall not be used in any such ship for the power, heat and light distribution systems thereof.
(3) If in any such ship 2 or more generating sets may be in operation at the same time for maintaining the auxiliary services essential for the propulsion or safety of the ship, provision shall be made for the sets to operate in parallel and means shall be provided to trip automatically sufficient non-essential load when the total current exceeds the connected generator capacity.
(4) (a) In every such ship electric and electro-hydraulic steering gear shall be served by 2 circuits fed from the main switchboard, one of which may pass through the emergency switchboard, if one is provided. Each circuit shall have adequate capacity for supplying all the motors which are normally connected to it and which operate simultaneously and if transfer arrangements are provided in the steering gear room to permit either circuit to supply any motor or combination of motors, the capacity of each circuit shall be adequate for the most severe load condition. The circuits shall be separated as widely as is practicable throughout their length.
(b) Short circuit protection only shall be provided for such circuits and motors.
(c) Every such ship which is fitted with electric or electro-hydraulic steering gear shall be provided with indicators which will show when the power units of such steering gear are running. These indicators shall be situated in suitable positions on the navigating bridge and in the machinery space or the machinery control room.
(5) The electrical arrangements for any automatic sprinkler and fire alarm and fire detection system shall comply with the requirements specified in Schedule 11 to the Merchant Shipping (Safety) (Fire Appliances) (Ships Built On or After 25 May 1980 but Before 1 September 1984) Regulations (Cap. 369 sub. leg. X). (E.R. 3 of 2022)
(6) In every such ship to which these regulations apply distribution systems shall be so arranged that a fire in any main fire zone will not interfere with essential services in any other main fire zone. Main and emergency feeders passing through any main fire zone shall be separated as widely as is practicable both horizontally and vertically.

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48. Spare parts and tools
Every ship shall be provided with an adequate quantity of replacements for those parts of the ship’s electrical equipment and installations which, having regard to the intended service of the ship, it would be essential for the safety of the ship and of persons on board to replace in the event of failure while the ship is at sea, together with such tools as are necessary for the fitting of these replacements.

49. Application of Part IVA
This Part applies to every existing passenger ship to which these regulations apply.

50. General
(1) Every ship to which this Part applies shall comply with regulations 41(1), 42, 45, 46(1), (2), (3), (4) and (6), 47 and 48.
(2) In every such ship, the electrical equipment and installations (including any electrical means of propulsion) shall be such that the ship and all persons on board are protected against electrical hazards and shall conform with the relevant provisions of the I.E.E. Regulations for the Electrical Equipment of Ships except in so far as such Regulations are inconsistent with this Part.
(3) If in any such ship the power supply for an automatic sprinkler system, requiring not less than 2 sources of power supply for sea-water pumps, air compressors and automatic alarms, is electrical, such power supplies shall be taken from the main generating sets and from an emergency source of electric power. One supply shall be taken from the main switchboard and another from the emergency switchboard, by separate feeders reserved solely for that purpose. Such feeders shall be run to a change-over switch situated near to the sprinkler unit and the switch shall normally be kept closed to the feeder from the emergency switchboard. The change-over switch shall be clearly labelled and no other switch shall be permitted in these feeders.

51. Application of Part V
This Part applies to new passenger ships of Class I, Class II or Class II(A) and carrying more than 36 passengers.