Section 2 Electrical Equipment

201. Earthing of non-metallic craft

1. To minimize the risk of fire, structural damage, electrical shock and radio interference due to light- ning strike or electrostatic discharge, all metal parts of the craft are to be bonded together, in so far as possible in consideration of galvanic corrosion between dissimilar metals, to form a con- tinuous electrical system, suitable for the earth return of electrical equipment and to connect the craft to the water when water-borne. The bonding of isolated components inside the structure is not generally necessary, except in fuel tanks.

2. Each pressure fueling point is to be provided with a means of bonding the fueling equipment to the craft.

3. Metallic pipes capable of generating electrostatic discharges, due to the flow of liquids and gases, are to be bonded so as to be electrically continuous throughout their length and they are to be ad- equately earthed.

4. Primary conductors for lightning discharge currents are to have a minimum cross section of 70

mm in copper, or an equivalent surge carrying capacity in

5. aluminium.

Secondary conductors provided for the equalization of static discharges, bonding of equipment, etc.,

but not for carrying lightning discharges, are to have a minimum cross section of 5 mm copper

6. or an equivalent surge current carrying capacity in aluminium.

The electrical resistance between bonded objects and the basic structure is not to exceed 0.02 ohms

except where it can be demonstrated that a higher resistance will not cause a hazard. The bonding part is to have sufficient cross-sectional area to carry the maximum current likely to be imposed on

202. Emergency electrical equipment

1. The emergency source of electrical power in cargo craft is to be capable of supplying simulta- neously at least the following services for the periods specified, having regard for starting currents and the transitory nature of certain loads, if they depend upon an electrical source for their oper- ation and this requirement substitutes for Pt 6, Ch 1, 1402. 2 of Rules for the Classification of Steel Ships.

(1) For a period of 12 hours, emergency lighting

(A) At the stowage positions of life-saving appliances.

(B) At all escape routes such as alleyways, stairways, exits from accommodation and spaces, embarkation points, etc.

(C) In the public spaces, if any.

(D) In the machinery spaces and main emergency generating spaces including their positions.

service control

Pt 6 Electrical Equipment and Control Systems

Ch 1 Electrical Equipment Pt 6, Ch 1

(E) In control stations.

(F) At the stowage positions for fireman's outfits, and

(G) At the steering gear.

(2) For a period of 12 hours

(A) The navigation lights and other lights required by the International Regulations for Preventing Collisions at Sea in force.

(B) Electrical internal communication equipment for announcements during evacuation.

(C) Fire detection and general alarm system and manual fire alarms, and

(D) Remote control devices of fire-extinguishing system, if electrical.

(3) For a period of 4 hours of intermittent operation

(A) The daylight signalling lamps, if they have no independent supply from their own accumu- lator battery, and

(B) The craft‘s whistle, if electrically driven.

(4) For a period of 12 hours

(A) The navigational equipment as required by chapter 13 of HSC code. Where such provision

is unreasonable or impracticable, the Society may waive this requirement for craft of less than 5,000 tons gross tonnage,

(B) Essential electrically powered instruments and controls for propulsion machinery, if alternate

sources of power are not available for such devices,

(C) One of the fire pumps required by Pt 7, Ch 2, 201. 8,

(D) The sprinkler pump and drencher pump, if fitted,

(E) The emergency bilge pump required by Pt 5 and all the equipment essential for the oper- ation of electrically powered remote controlled bilge valves, and

(F) Craft radio facilities and other loads as set out in 14.12.2 of HSC code.

(5) For a period of 10 minutes

Power drives for directional control devices including those required to direct thrust forward and astern, unless there is a manual alternative acceptable to the Society.

2. The emergency source of electrical power in passenger craft is to be capable, having regard to

starting currents and the transitory nature of certain loads, of following services for the periods specified hereinafter, if they

supplying simultaneously at least the demand upon an electrical source for

their operation and this requirement substitutes for Pt 6, Ch 1, 1402. 2 of Rules for the Classification of Steel Ships.

(1) For category A craft, the emergency source of power is to be capable of supplying the follow- ing services simultaneously. 【See Guidance】

(A) For a period of 5 hours, emergency lighting

(a)

At the stowage positions of life-saving appliances,

(b) At all escape routes such as alleyways, stairways, exits from accommodation and service spaces, embarkation points, etc.

(c)

In the public spaces,

(d) In the machinery spaces and main emergency generating spaces including their control positions,

(e)

(f)

In control stations,

At the stowage positions for firemen's outfits, and

(g) At the steering gear.

(B) For a period of 5 hours

(a)

Main navigation lights, except for "not under command" lights,

(b) Electrical internal communication equipment required for announcements for passengers and crew during evacuation,

(c)

Fire detection and general alarm system, and manual fire alarms, and

(d) Remote control devices of fire-extinguishing systems, if electrical.

(C) For a period of 4 hours of intermittent operation

(a)

Daylight signalling lamps, if they have no independent supply from their own accumu- lator battery, and

(b) The craft whistle, if electrically driven.

(D) For a period of 5 hours

(a)

Craft radio facilities and other loads as set out in 14.12.2 of HSC code, and

(b) Essential electrically powered instruments and controls for propulsion machinery, if alter- nate sources of power are not available for such devices.

(E) For a period of 12 hours

Pt 6 Electrical Equipment and Control Systems

Ch 1 Electrical Equipment Pt 6, Ch 1

The "not under command" lights.

(F) For a period of 10 minutes

Power drives for directional control devices including those required to direct thrust forward and astern, unless there is a manual alternative acceptable to the Society complying with

5.2.3 of HSC code.

(2) For category B craft, the emergency source of power is to be capable of supplying the follow- ing services simultaneously

(A) For a period of 12 hours, emergency lighting

(a)

At the stowage positions of life-saving appliances,

(b) At all escape routes such as alleyways, stairways, exits from accommodation and service spaces, embarkation points, etc,

(c)

In the passenger compartments,

(d) In the machinery spaces and main emergency generating spaces including their control positions,

(e)

(f)

In control stations,

At the stowage positions for firemen's outfits, and

(g) At the steering gear.

(B) For a period of 12 hours

(a)

The navigation lights and other lights required by the International Regulations for Preventing Collisions at Sea,

(b) Electrical internal communication equipment for announcements for passengers and crew

required during evacuation,

(c)

Fire detection and general alarm system and manual fire alarms, and

(d) Remote control devices of fire-extinguishing systems, if electrical.

(C) For a period of 4 hours of intermittent operation

(a)

Daylight signalling lamps, if they have no independent supply from their own accumu- lator battery, and

(b) The craft whistle, if electrically driven

(D) For a period of 12 hours

(a)

The navigational equipment as required by chapter 13 of HSC code. Where such provi- sion is unreasonable or impracticable, the Society may waive this requirement for craft

of less than 5,000 tons gross tonnage,

(b) Essential electrically powered instruments and controls for propulsion machinery, if alter- nate sources of power are not available for such devices,

(c)

One of the fire pumps required by Pt 7, Ch 2, 201. 8,

(d) The sprinkler pump and drencher pump, if fitted,

(e)

(f)

The emergency bilge pump required by Pt 5 and all the equipment essential for the op- eration of electrically powered remote controlled bilge valves, and

Craft radio facilities and other loads as set out in 14.12.2 of HSC code.

(E) For a period of 30 minutes

Any watertight doors, required by chapter 2 of HSC code to be power operated, together with indicators and warning signals.

(F) For a period of 10 minutes

Power drives for directional control devices including those required to direct thrust forward and astern, unless there is a manual alternative acceptable to the Society complying with

5.2.3 of HSC code.

3. In addition to the emergency lighting required by 2 (1) (A) and (2) (A) above on every passenger craft with special category spaces

(1) All passenger public spaces and ing that can operate for at least electric power have failed. The means of escape can be readily

alleyways are to be provided with supplementary electric light- 3 hours under any condition of heel when all other sources of illumination provided is to be such that the approach to the seen. The source of power for the supplementary lighting is to

consist of accumulator batteries located within the lighting units that are continuously charged,

where practicable, from the emergency switchboard. Alternatively, any other means of effective lighting may be accepted. Supplementary lighting is to be such that any lamp failure will be immediately apparent. Accumulator batteries are to be replaced at intervals having regard for the specified service life in the ambient service condition, and

(2) A portable rechargeable battery operated lamp is to be provided in every recreational space and every working space which is normally occupied

crew space alleyway, unless supplementary

Pt 6 Electrical Equipment and Control Systems

Ch 1 Electrical Equipment Pt 6, Ch 1

emergency lighting, as required by (1) above, is provided

4. Transitional sources of emergency electrical power are to comply with Pt 6, Ch 1, 1404. of Rules for the Classification of Steel Ships and the following requirements instead of Pt 6, Ch 1, 1404. (2) (B) of the Rules.

(1) Power to operate the watertight doors, but not necessarily simultaneously, unless an independent temporary source of stored energy is provided. The power source is to have sufficient capacity to operate each door at least three times; i.e., closed - open - closed, against an adverse list of 15°; and

(2) Power to the control, indication and alarm circuits for the watertight doors for 30 minutes.

5. The emergency generator and its prime mover and any emergency accumulator battery are to be so designed and arranged as to ensure that they will function at full rated power when the craft is upright and when the craft has an expected list or trimming including damage cases in chapter 2 of HSC code, or is in any combination of angles within those limits.

6. As the substitute requirement for Pt 6, Ch 1, 1401. 2 of Rules for the Classification of Steel Ships, the emergency source of electrical power, associated transforming equipment, if any, transi- tional source of electrical power, emergency switchboard and emergency lighting switchboard are to be located above the waterline in the final condition of damage as referred to in chapter 2 of HSC code, operable in that condition and readily accessible. 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 electrical lighting switchboards in relation to the main source of electrical power, associated transforming equipment, if any, and the main switchboard are to be such as to ensure that a fire or other casualty in spaces containing main source of electrical power, associated transforming equipment, if any, and the main switchboard or in any machinery space will not interfere with the supply, control and distribution of emergency electrical power.

7. Where the main source of electrical power is located in two or more compartments which are not contiguous, each of which has its own self-contained systems, including power distribution and con- trol systems, completely independent of each other and such that a fire or other casualty in any one of the spaces will not affect the power distribution from the others, or to the services required by Par 1 or 2 (1) or (2), the requirements of Par 6 and Pt 6, Ch 1, 1401. 1 and 4 of Rules for the Classification of Steel Ships may be considered as met without an additional emergency source of electrical power, provided that

(1) There is at least one generating set, meeting the requirements of Par 5 above and each with sufficient capacity to meet the requirements of Par 1 or 2 (1) or (2), in each of at least two non- contiguous spaces,

(2) The arrangements required by (1) above in each such space are equivalent to those required by

Pt 6, Ch 1, 1403. (1), 1405. and

Ships so that a source of electrical

1406. 1 to 3 of Rules for the Classification of Steel

power is available at all times to the services required by

Par 1 or 2 (1) or (2) and by

(3) The generator sets referred to cordance with Par 6.

Par 7 and

in (1) above and their self-contained systems are installed in ac-

203. Stabilization system of craft 【See Guidance】

1. Where stabilization system of a craft is essentially dependent on one device as with a single rudder or pylon, which is itself dependent on the continuous availability of electric power, it should be served by at least two independent circuits, one of which is to be fed either from the emergency source of electric power or from an independent power source located in such a position as to be unaffected by fire or flooding affecting the main source of power. Failure of either supply is not to cause any risk to the craft or passengers during switching to the alternative supply and such switching arrangements are to meet the requirements in 5.2.5 of HSC code. These circuits are to be provided with short circuit protection and an overload alarm.

2. Protection against excess current may be provided, in which case it is to be for not less than twice the full load current of the motor or circuit so protected, and is to be arranged to accept the ap- propriate starting current with a reasonable margin. Where three-phase supply is used, an alarm is to be provided in a readily observed position in the craft's operating compartment that will indicate failure of any one of the phases.

3. Where such systems are not essentially dependent on the continuous availability of electric power but at least one alternative system, not dependent on the electric supply is installed, then the elec- trically powered or controlled system may be fed by a single circuit protected in accordance with Par 2.

4. The requirements of chapters 5 and 16 of HSC code for power supply of the directional control system and stabilization system of the craft are to be met.