Part A Passenger ships and cargo ships of 500GT or more with a length of 24 meter or more
Applying all passenger ships and cargo ships of 500GT or more with a length of 24 meter
or more.
Contents :
NSI interpretations, additional legal regulations and notes regarding
Solas 1974 Consolidated edition 2001.
I Chapter II-1: Part D, Electrical installations;
II Chapter II-1: Part C, Machinery installations;
III Chapter II-2: Fire protection, fire detection and fire extinction:
IV Chapter IV : Radiocommunications.
V Chapter V : Safety of navigation.
I Chapter II-1: Part D, Electrical installations
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER II-1, PART D,
ELECTRICAL INSTALLATIONS WITH ADDITIONAL LEGAL REGULATIONS AND NSI NOTES, WITH REGARD
TO DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS.
SOLAS Chapter II-1, Part D, Electrical installations.
Regulation 40, GENERAL.
Regulation 40.2.
In order to ensure uniformity in the implementation and application of the provisions in respect of electrical
installations the Netherlands Administrations has included the IEC PUBLICATION 92
in the national
legislation by means of issuing the Notice to the shipping no. 204/1986 , which means that the electrical
installations have to comply with the relevant standards of:
a) SOLAS;
b) in relation to its design and construction: to the relevant standards/regulation of the classification society;
c) when these standards/regulations do not offer a solution, are too vague or in contradiction with the
objectives and standards of general safety, IEC PUBLICATION 92 is employed as an objective criterion.
Regulation 41, Main source of electrical power.
Regulation 41.1.2
It is allowed to trip the services for cooking, heating, domestic refrigeration, mechanical ventilation, sanitary
and fresh water if the total power consumption is calculated to the approved load balance calculation
maintained by one or by no more than two generating sets in parallel.
Regulation 42, Emergency source of electrical power in passenger ships.
Regulation 42.1.3
To fulfil the satisfaction of this Administration linkages, couplings, interfaces between the main switchboard
and the emergency switchboard, remote controls of their prime movers may not interfere the emergency
generator with switchboard, if the main electrical installation is destroyed by fire or other calamity.
For example: The disconnecting or shorting must be obtained automatically by means of using auxiliary
contacts of the bustie breaker in the emergency switchboard or manually by using contacts of a change over
switch in the emergency switchboard for the mode ”emergency standby/harbour service off”, both
automatically or manually providing the safe situation of disconnecting and shorting in the emergency mode
Other solutions which guarantee the same integrity of the emergency switchboard, are acceptable as well.
Regulation 42.1.4:
According to NSIthe suitable measures to be taken for safeguarding independent
emergency operation under all circumstances in case of using the emergency generator to supply nonemergency
circuits, e.g. as harbour generator during lay time in port consist for example: where the
emergency switchboard is arranged for feed-back operation, before the provisions of regulation 42.5.5 come
into operation caused by overload, the interconnector feeder between emergency switchboard and main
switchboard shall be disconnected as preference tripping breaker upon overload of the emergency
generator.
Regulation 42.2.1. Emergency lighting.
In addition to SOLAS 2001, requirements also the following places:
Regulation 42.2.1.9. galleys, mess rooms, lounges, movie theatres, movie operator spaces and other
public spaces, and
Regulation 42.2.1.10 at the centralised operating stations for fixed fire extinguishing installations.
Regulation 43, Emergency source of electrical power in cargo ships.
Regulation 43.1.3
To fulfil the satisfaction of this Administration linkages, couplings, interfaces between the main switchboard
and the emergency switchboard, remote controls of their prime movers may not interfere the emergency
generator with switchboard, if the main electrical installation is destroyed by fire or other calamity.
For example: The disconnecting or shorting must be obtained automatically by means of using auxiliary
contacts of the bustie breaker in the emergency switchboard or manually by using contacts of a change over
switch in the emergency switchboard for ”emergency stand by/harbour service,off”, both automatically or
manually providing the safe situation of disconnecting and shorting in the emergency mode.
Other solutions which guarantee the same integrity of the emergency switchboard, are acceptable as well.
Regulation 43.1.4:
According to NSI the suitable measures to be taken for safeguarding independent
emergency operation under all circumstances in case of using the emergency generator to supply nonemergency
circuits, e.g. as harbour generator during lay time in port consist for example: where the
emergency switchboard is arranged for feed-back operation, before the provisions of regulation 42.5.5 come
into operation caused by overload, the interconnector feeder between emergency switchboard and main
switchboard shall be disconnected as preference tripping breaker upon overload of the emergency
generator.
Regulation 43.2.2 Emergency lighting.
In addition to SOLAS 2001 requirements also the following places:
Regulation 43.2.2.7 in galleys, mess rooms and other public spaces.
Regulation 43.2.2.8 at the centralised operating stations for fixed fire extinguishing installations.
IEC 60092-302.
Article 7.6.102:Synchronising devices.
In contravention of the IEC-rules, it is allowed, in the case of automation, to omit the required manual
control, if the degree of automation is carried out redundant or multiple.
If manual synchronising, according classification or IEC-rules is required, at least one synchronosscope or
three synchronising lamps or other equivalent means shall be provided.
Regulation 45.5.3:
This Administration does not allow cables, even not, cables of a fire resisting type,
connecting fire pumps to the emergency switchboard to pass machinery spaces of category A or spaces
containing the main source of electrical power and associated equipment. In addition, all cables or wiring as
a part of emergency equipment such as emergency power, emergency lighting, internal communications or
signal shall routed clear of galleys, laundries, machinery spaces of category A and their casings and other
high fire risk areas.
Regulation 45.9.
”Valve regulated batteries” are not accepted or recognized as gas free batteries.
In connection with the high short current of batteries, the battery fuses shall be installed
as near as practicable to the battery. (Maximum distance 3 meters measured from the
battery).
45a2 Deck equipment
1 electrically powered deck equipment for cargo handling equipment of ships registered in the
Netherlands or Netherlands Antilles comply with the requirements stated by or on behalf of
the Arbeidsomstandigheden wet. Electrically powered deck equipment for cargo handling
equipment of ships registered in Aruba comply with the requirements stated by or on behalf
of the Stuwadoorsverordening.
2 electrically powered deck equipment for other purposes as aforementioned in paragraph 2.1
must be constructed in such a way that:
a. starting the driving electric motor is only possible directly from the zero
position of the control handles;
b. upon failure of the electric power supply or interruption of the supply current to
the driving electric motor the brake must automatically come into action and keep the load.
This regulation is not applicable for deck equipment where the brake has to be manually
operated in order to lower the load;
c. in case of application of control current, the occurrence of an earth short in the
control current circuit shall not cause the starting or remaining of running of the driving
electric motor, nor the brake of the winch remaining in the released position;
d. that the position of the control handle for hoisting and lowering of electrically
powered deck equipment is indicated in a clear and durable way close to that handle; and
e. a switch or auxiliary switch is fitted at the deck equipment”s control station,
enabling to switch off the electric power supply to the deck equipment concerned
regardless of the position of the control handle.
Equivalent classification rules may replace the aforementioned regulations (45a2).
Regulation 45e :Vocal communication systems.
1.1 The means of communication as mentioned in regulation 29 and 37 (Part C) of which the N.S.I.
interpretation is ”efficient direct vocal communication” shall be independent from the ships main
electrical distribution system. For example: A feeding arrangement conducted from the emergency
switchboard is allowed.
1.2 If a centralised telephone exchange system or equivalent vocal communication system is applied, the
extensions in wheelhouse, engine room and accommodations of captain and chief engineer shall be
provided with priority provision, enabling a direct mutual connection.
Regulation45f, Lock-in alarm for refrigeration and freezer spaces.
Where the doors cannot be opened from the inside under all conditions, an alarm system shall be installed,
enabling to activate an audible alarm in a suitable location from the inside of the concerned refrigeration or
freezer space.
II Chapter II-1: Part C, Machinery installations
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER II-1, PART C,
MACHINERY INSTALLATIONS, WITH ADDITIONAL LEGAL REGULATIONS AND N.S.I. NOTES WITH
REGARD TO DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS MENTIONED IN
THAT PART C.
Regulation 37, further legal additions:
A. An efficient direct vocal communication system shall be provided between the navigating bridge
and the captains accommodation
B. An efficient direct vocal communication system shall be provided between the positions from which
the propulsion installation can be controlled and the chief engineers accommodation.
C. The efficient direct vocal communication systems mentioned in the foregoing paragraphs shall meet
the requirements of regulation 45e.
III Chapter II-2: Fire protection, fire detection and fire extinction
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER II-2 FIRE
PROTECTION, FIRE DETECTION AND FIRE EXTINCTION, WITH N.S.I. NOTES WITH REGARD TO DESIGN
AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS MENTIONED IN THAT CHAPTER II-2.
Part A, General, Regulation 5.1.6 (new:FSS-Code, chapter 5, paragraph 2.1), Fixed gas fire-extinguishing
systems: audible warning.
According to Notice to the Shipping No. 278/1992, Regulation 6.2 the automatic audible alarm shall be
generated by an electrical driven device. In order to obtain good audibility in all spaces concerned (without
visible signals) under full operational conditions, klaxons or sirens shall be used producing an alarm sound
with variable pitch.
IV Chapter IV: Radiocommunications
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER IV,
RADIOCOMMUNICATIONS , WITH ADDITIONAL LEGAL REGULATIONS AND N.S.I. NOTES WITH
REGARD TO DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS MENTIONED IN
THAT CHAPTER IV.
Regulation 13, Sources of energy.
For schematic details and further information see also CIRCULAR 25.
Rulation 13.1: At all times availability of electric supply while the ship is at sea.
N.S.I. interpretation :
In order to fulfil the requirements of this regulation the entire GMDSS and ECDIS installation shall
be supplied by means of a change-over switch on the navigating bridge (preferably automatic),
through which direct electrical supply is possible from the main switchboard and from the
emergency switchboard. Where a ship is not provided with an emergency source of electric power
complying fully with all relevant provisions of regulation II-1/42 or 43 (which is generally the case
with ships built before the 1st of July 1986), electric supply from the emergency switchboard is not
required (but the reserve source of energy shall have a capacity for a period of at least 6 hours).
Regulation 13.2, Reserve source of energy
N.S.I. interpretations:
* The reserve battery shall be used in the event of failure of the ship•s main and emergency
sources of electrical power. Therefore in normal service conditions electric energy is
supplied by the main switchboard, and the reserve battery is only stand-by or being
charged by its automatic battery charger.
* If the main and emergency supply or (in case only) the main supply fail(s), the connected
GMDSS equipment shall be able to be switched over to the reserve battery. So the reserve
battery shall not be used in buffer connected service.
* Supply from the reserve source of energy
# In case of 13.2.1 the most important supply in an emergency is coming from the
emergency source of electrical power, which is designed to maintain during at least 18
hours; therefore the individual GMDSS equipment shall be designed for operation with
the supply voltage and frequency (if applicable) delivered by the emergency
switchboard, and if a voltage converter is necessary for this purpose, every individual
GMDSS equipment shall be provided with its own converter.
In this case the reserve source acts only as a transitional source of power.
# In case of 13.2.2 the most important supply in an emergency is coming from the reserve
source of power, which is designed to maintain during at least 6 hours; therefore the
individual GMDSS equipment shall be designed for operation with the supply voltage
and frequency (usually not applicable) delivered by the reserve source of energy which
is usually a battery, and if a voltage converter is necessary for this purpose, every
individual GMDSS equipment shall be provided with its own converter.
In this case the emergency source of electrical power of the ship, not complying with
the provisions of regulation II-1/42 of 43, is considered to be of insufficient reliability for
the emergency supply of the GMDSS equipment.
# In order to obtain the highest possible reliability of the electric supply system, every
connected part of the basic equipment as composed by the equipment required by the
regulations 7, 8, 9, 10 and 11, shall be provided with its own change-over switch in
order to change from normal supply to reserve supply.
NOTE: To determine the electrical load to be supplied by the reserve source of energy for each radio
installation required for distress conditions, the following formula should be applied: • of the
current consumption necessary for transmission (for MF/HF single side band transmission •) + the
current consumption necessary for reception + the current consumption of any additional loads.
Regulation 13.6, Reserve source of energy being a rechargeable accumulator battery
For the reserve source of energy being a rechargeable accumulator battery, the Notice to the Shipping No.
282/1992, Accumulator storage batteries used as reserve source of power for the radio-installatio ns, has
been issued.
In brief this notice provides the following regulations:
1 Only nickel-alkaline, lead-acid or complete maintenance-free storage accumulators may be
used;
2 At least one of the methods of checking mentioned in paragraph 5 shall be applied;
3 The system of the automatic battery charger shall be designed for operation with a
programmed Voltage/Current charging characteristic.
4 The minimum battery capacity is to be calculated with the following formula:
C = K(charge) × K(disch.) × I ,
where
C = Battery capacity in Ah,
K(charge) = 10/7 (or 1,43),
K(disch.) = 10/3, in case of 1 hour battery service
or 10, in case of 6 hours battery service,
and
K(charge) as result of the prescribed automatic charger and the requirement of
charging an empty battery within 10 hours,
K(disch.) as result of the requirement to consider the expected extreme
temperatures for the location of the battery and the reduction of battery capacity
during its lifetime.
5 The yearly battery check can be applied by:
a. measuring the specific gravity of the electrolyte as well as the no-load voltage of
each cell, and applying the formula: Cell voltage = specific gravity + 0,84; or
b. measuring the specific gravity at fully charged condition; or
c. carrying out a load duration test, by which the battery capacity shall be checked by
means of observing the declining course of voltage in relation to a determined
discharging time, using a determined load.
6 The reserve source(s) of energy shall be:
• situated in the highest part of the ship as practical is possible, and
• designed and arranged so that a fire or other casualty inside the spaces containing
the main source of electrical power and other spaces of category A will not
interfere with the good working order of the reserve source of energy.
Regulation 15, Maintenance requirements and availability
The maintenance that the Administration shall ensure according regulation 15.5, and the methods as may be
approved by the Administration according regulations 15.6 and 15.7 among others consist of the following:
* shore based maintenance is mandatory; at sea maintenance capability is no option; and
* duplication of equipment is mandatory for sea areas A3 and A4.
In connection with the aforementioned, legal additions have been issued, which -with regard to the electric
supply system and maintenance- contain the following items:
• The •basic equipment• is defined as composed by the prescribed equipment in compliance with the
regulations 7, 8, 9, 10 and 11;
• The •duplicated equipment• , being the required equipment in addition to the basic equipment, shall be
able of operating independently from the other radio equipment and shall be provided with its own
antenna-equipment. The control of this equipment shall be directly possible on the navigating bridge
near the normal navigation position.
• Like the basic equipment the duplicated equipment shall be able of connecting to the supply from the
reserve source(s) of energy by means of change-over switches.
• The capacity of the reserve source(s) of energy shall be sufficient of supplying those parts of the basic
equipment and the corresponding parts of the duplicated equipment with the greatest power
simultaneously during the period as required by regulation 13.2.1 or 13.2.2.
• The electric supply system for the basic equipment and the duplicated equipment shall be such that a
single failure of the reserve source of energy cannot cause a simultaneous breakdown of the basic equipment and the duplicated equipment, while the main source of electric power or the emergency
source of electric power is in normal operation.
NSI NOTE
- In order to obtain the highest possible reliability of the electric supply system, every connected
part, whether basic or duplicated equipment, shall be provided with its own change-over switch in
order to change from normal supply to reserve supply; e.g. in case the normal supply for the basic
equipment fails and one of the connected parts of the duplicated equipment is out of order, it will
be
possible to change-over the supply of the corresponding part of the basic equipment to the reserve
electric supply.
V Chapter V: Safety of navigation
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER V, SAFETY
OF NAVIGATION, WITH ADDITIONAL LEGAL REGULATIONS AND N.S.I. NOTES WITH REGARD TO
DESIGN AND PRACTICAL PERFORMANCE OF THE POWER SUPPLY INSTALLATION FOR THE ECDIS
The requirements regarding power supply of ECDIS systems (main and back up system) are the same as for
navigation equipment mentioned in regulation V/12 with the addition of the requirement that the ECDIS
and all equipment necessary for its function should not require the equipment to be re-initialized manually
by changing from one source of power supply to another, or any interruption of the supply for a period of
up to 45 s. (IMO Res. A 817(19))
As continuous position-fixing, heading and speed information is required by IMO Res. A 817(19) to ensure
its proper performance, means shall be provided to ensure the continuous supply of such information in the
event of failure of the ship's main source of electrical power by providing for the ECDIS and all equipment
necessary for its function with a transitional source of emergency electrical power as defined in SOLAS
Chapter II-1, regulation 42.4 for at least half an hour.
The existing transitional source of emergency as required in SOLAS regulation II-1/42.4 or 43.4 may be used
or a separated UPS is required.
NSI Interpretations:
° The transitional source for ECDIS and all equipment necessary for its function shall not interfere the
feeding arrangement from the main source of electrical power in the event of a breakdown of the traditional source;
° The transitional source for ECDIS and all equipment necessary for its function is not accepted as an
emergency source of electrical power;
° The transitional source of power for ECDIS and all equipment necessary for its function needs a yearly
battery check as mentioned in NOTICE TO THE SHIPPING NO. 282/1992 and shall be done by the
manufacturer or a person authorized by the manufacturer. According manufacturer his specifications and instructions.
° The transitional source for ECDIS and all equipment necessary for its function shall not be used in
buffer connected service.
° When the transitional source of power is in use, this shall be indicated on the bridge by an audible as
well a visual alarm signal.
Part B Cargo ships of less than 500GT and more than 24 meter and cargo ships of less than 500GT for which part C is not applicable
Applying all cargo ships of less than 500 GT and more than 24 meter
and cargo ships of less than 500 GT for which part C is not applicable.
Contents :
NSI interpretations, additional legal regulations and notes regarding
Solas 1974 Consolidated edition 2001.
I Chapter II-1, Part D, Electrical installations;
II Chapter II-1, Part C, Machinery installations;
III Chapter II-2, Fire protection, fire detection and fire extinction:
IV Chapter IV, Radiocommunications.
V Chapter V, Safety of navigation.
I Chapter II-1: Part D, Electrical installations
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER II-1, PART D,
ELECTRICAL INSTALLATIONS WITH ADDITIONAL LEGAL REGULATIONS AND NSI NOTES, WITH REGARD
TO DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS.
SOLAS Chapter II-1, Part D, Electrical installations.
Regulation 40, GENERAL.
Regulation 40.2.
In order to ensure uniformity in the implementation and application of the provisions in respect of electrical
installations the Netherlands Administrations has included the IEC PUBLICATION 92 in the national
legislation by means of issuing the Notice to the shipping no. 204/1986 , which means that the electrical
installations have to comply with the relevant standards of:
a) Observing the relevant regulation of SOLAS, so far SOLAS is relevant for the purpose of the ship.
b) in relation to its design and construction: to the relevant standards/regulation of the classification society;
c) when these standards/regulations do not offer a solution, are too vague or in contradiction with the
objectives and standards of general safety, IEC PUBLICATION 92 is employed as an objective criterion .
Regulation 41, Main source of electrical power.
Regulation 41.1.2
It is allowed to trip the services for cooking, heating, domestic refrigeration, mechanical ventilation, sanitary
and fresh water if the total power consumption is calculated to the approved load balance calculation
maintained by one or by no more than two generating sets in parallel.
Regulation 41.5
For ships less than 500 GT article 41.5.1.3 is not applicable
Regulation 43, Emergency source of electrical power in cargo ships.
Legal addition:
Regulation 43a, Emergency source of electrical power on board cargo ships of le ss than 500 GT
1.1 On board a cargo ship of less than 500 GT an emergency source of electrical power must be available
which is independent from the propulsion installation and from the main electrical source of power.
1.2 The emergency source of electrical power, including associated transforming equipment, if any, the
emergency switchboard and the emergency lighting switchboard must be located outside the
boundaries of machinery spaces of category A and outside the spaces containing the main source of
electrical power, including transforming equipment, if any, or the main switchboard.
Supply, control and distribution of emergency electrical power shall not be interfered by a fire or other
casualty inside the last mentioned spaces.
2 The emergency source of electrical power may be either a generator or an accumulator battery, which
shall comply with the following:
2.1 where the emergency source of electrical power is a generator, it shall be driven by a direct connected
prime mover with an independent supply of fuel, having a flashpoint of not less than 43°C (close cup
test);
2.2 where the emergency source of electrical power is an accumulator battery, it shall be capable of:
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;
2 automatically connecting to the emergency switchboard in the event of failure of the main source of
electrical power, and
3 immediately supplying at least those services specified in paragraph 3.
3 The electrical power available from the emergency source of power 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:
3.1 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/15.7;
3.2 for a period of 6 h, the emergency lighting at the concerning locations as required by regulation 43.2.2,
the services as required by regulation 43.2.3, the intermittent operation of the daylight signalling lamp,
the ships whistle if electrically powered or controlled, the general emergency alarm system required by
regulation III/6.4.2 and the means of communication as required by regulations II-1/29.10 and II-1/37;
3.3 the fire detection and fire alarm system as far as required and unless such services have an independent
supply, the audible warning of release of fire-extinguishing medium as required by regulation II-2/5.1.6
and the pump of the fixed pressure water-spraying fire-extinguishing system in machinery spaces as
required by regulation II-2/10.6, if dependent upon the emergency generator for its source of power;
and
3.4 for a period of 6 hours the ECDIS system and all equipment necessary for its normal functioning.
4 The arrangement and formation of the emergency generator and his prime mover or the emergency
accumulator battery as well as the emergency switchboard shall meet the requirements mentioned in
the regulations 43.5.1 up to and including 43.5.5 and 43.6.
5 Provision shall be made for the periodic testing of the complete emergency system.
Regulation 43.a.4. (SOLAS 43.5.4).
To fulfil the satisfaction of this Administration linkages, couplings, interfaces between the main switchboard
and the emergency switchboard, remote controls of their prime movers may not interfere the emergency
generator with switchboard, if the main electrical installation is destroyed by fire or other calamity.
For example: The disconnecting or shorting must be obtained automatically by means of using auxiliary
contacts of the bustie breaker in the emergency switchboard or manually by using contacts of a change over
switch in the emergency switchboard for ”emergency stand by/harbour service off”, both automatically or
manually providing the safe situation of disconnecting and shorting in the emergency mode.
Other solutions which guarantee the same integrity of the emergency switchboard, are acceptable as well.
Regulation 43.1.4:
According to NSI the suitable measures to be taken for safeguarding independent
emergency operation under all circumstances in case of using the emergency generator to supply nonemergency
circuits, e.g. as harbour generator during lay time in port consist for example: where the
emergency switchboard is arranged for feed-back operation, before the provisions of regulation 42.5.5 come
into operation caused by overload, the interconnector feeder between emergency switchboard and main
switchboard shall be disconnected as preference tripping breaker upon overload of the emergency
generator.
Regulation 43.2.2 Emergency lighting.
In addition to SOLAS 2001 requirements also the following places:
Regulation 43.2.2.7 in galleys, mess rooms and other public spaces.
Regulation 43.2.2.8 at the centralised operating stations for fixed fire extinguishing installations.
IEC 60092-302.
Article 7.6.104L: Synchronising devices.
In contravention of the IEC-rules, it is allowed, in the case of automation, to omit the required manual
control, if the degree of automation is carried out redundant or multiple.
If manual synchronising, according classification or IEC-rules is required, at least one synchronosscope or
three synchronising lamps or other equivalent means shall be provided.
Regulation 45.5.3: Cable routing
This Administration does not allow cables, even not, cables of a fire resisting type, connecting fire pumps to
the emergency switchboard to pass machinery spaces of category A or spaces containing the main source of
electrical power and associated equipment. In addition, all cables or wiring as a part of emergency
equipment such as emergency power, emergency lighting, internal communications or signal shall routed
clear of galleys, laundries, machinery spaces of category A and their casings and other high fire risk areas.
Regulation 45.9.
”Valve regulated batteries” are not accepted or recognized as gas free batteries.
In connection with the high short current of batteries, the battery fuses shall be installed as near as
practicable to the battery. (Maximum distance 3 meters measured from the battery).
45a2 Deck equipment
1 electrically powered deck equipment for cargo handling equipment of ships registered in the
Netherlands or Netherlands Antilles comply with the requirements stated by or on behalf of the
Arbeidsomstandigheden wet. Electrically powered deck equipment for cargo handling equipment of
ships registered in Aruba comply with the requirements stated by or on behalf of the
Stuwadoorsverordening.
2 electrically powered deck equipment for other purposes as aforementioned in paragraph 2.1 must
be constructed in such a way that:
a. starting the driving electric motor is only possible directly from the zero position of the
control handles;
b. upon failure of the electric power supply or interruption of the supply current to the driving
electric motor the brake must automatically come into action and keep the load.
This regulation is
not applicable for deck equipment where the brake has to be manually operated in order to lower
the load;
c. in case of application of control current, the occurrence of an earth short in the control
current circuit shall not cause the starting or remaining of running of the driving electric motor, nor
the brake of the winch remaining in the released position;
d. that the position of the control handle for hoisting and lowering of electrically powered
deck equipment is indicated in a clear and durable way close to that handle; and
e. a switch or auxiliary switch is fitted at the deck equipment”s control station, enabling to
switch off the electric power supply to the deck equipment concerned regardless of the position of
the control handle.
Equivalent classification rules may replace the aforementioned regulations (45a2).
Regulation 45e :Vocal communication systems.
1.1 The means of communication as mentioned in regulation 29 and 37 (Part C) of which the N.S.I.
interpretation is ”efficient direct vocal communication” shall be independent from the ships main
electrical distribution system. For example: A feeding arrangement conducted from the emergency
switchboard is allowed.
1.2 If a centralised telephone exchange system or equivalent vocal communication system is applied, the
extensions in wheelhouse, engine room and accommodations of captain and chief engineer shall be
provided with priority provision, enabling a direct mutual connection.
Regulation 45f, Lock-in alarm for refrigeration and freezer spaces.
Where the doors cannot be opened from the inside under all conditions, an alarm system shall be installed,
enabling to activate an audible alarm in a suitable location from the inside of the concerned refrigeration or
freezer space.
II Chapter II-1: Part C, Machinery installations
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER II-1, PART C,
MACHINERY INSTALLATIONS, WITH ADDITIONAL LEGAL REGULATIONS AND N.S.I. NOTES WITH
REGARD TO DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS MENTIONED IN
THAT PART C.
Regulation 37, Communication between navigation bridge and machinery spaces.
Regulation 37.1 and 37.2. Legal edition.
The engine-room telegraph is not required on board of a cargo ship of less than 500 GT.
Regulation 37, further legal additions:
13.1 An efficient direct vocal communication system shall be provided between the navigating bridge
and the captains accommodation.
13.2 An efficient direct vocal communication system shall be provided between the positions from which the
propulsion installation can be controlled and the chief engineers accommodation.
13.3 The efficient direct vocal communication systems mentioned in the foregoing paragraphs shall meet
the requirements of regulation 45e.
III Chapter II-2: Fire protection, fire detection and fire extinction
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER II-2 FIRE
PROTECTION, FIRE DETECTION AND FIRE EXTINCTION, WITH N.S.I./DV NOTES WITH REGARD TO
DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS MENTIONED IN THAT
CHAPTER II-2.
Part A, General, Regulation 5.1.6 (new:FSS-Code, chapter 5, paragraph 2.1), Fixed gas fire-extinguishing
systems: audible warning.
According to Notice to the Shipping No. 278/1992, Regulation 6.2 the automatic audible alarm shall be
generated by an electrical driven device. In order to obtain good audibility in all spaces concerned (without
visible signals) under full operational conditions, klaxons or sirens shall be used producing an alarm sound
with variable pitch.
IV Chapter IV: Radiocommunications
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER IV,
RADIOCOMMUNICATIONS , WITH ADDITIONAL LEGAL REGULATIONS AND N.S.I. NOTES WITH
REGARD TO DESIGN AND PRACTICAL PERFORMANCE OF ELECTRICAL INSTALLATIONS MENTIONED IN
THAT CHAPTER IV.
Regulation 13, Sources of energy.
For schematic details and further information see also CIRCULAR 25.
Regulation 13.1: At all times availability of electric supply while the ship is at sea.
N.S.I. interpretation :
In order to fulfil the requirements of this regulation the entire GMDSS installation shall be supplied by
means of a change-over switch on the navigating bridge (preferably automatic), through which direct
electrical supply is possible from the main switchboard and from the emergency switchboard. Where
a ship is not provided with an emergency source of electric power complying fully with all relevant
provisions of regulation II-1/42 or 43 (which is generally the case with ships less than 500 GT),
electric supply from the emergency switchboard is not required (but the reserve source of energy shall
have a capacity for a period of at least 6 hours).
Regulation 13.2, Reserve source of energy
NSI . interpretations:
* The reserve battery shall be used in the event of failure of the ship•s main and emergency
sources of electrical power. Therefore in normal service conditions electric energy is
supplied by the main switchboard, and the reserve battery is only stand-by or being
charged by its automatic battery charger.
* If the main and emergency supply or (in case only) the main supply fail(s), the connected
GMDSS equipment shall be able to be switched over to the reserve battery. So the reserve
battery shall not be used in buffer connected service.
* Supply from the reserve source of energy.
# In case of 13.2.1 the most important supply in an emergency is coming from the
emergency source of electrical power, which is designed to maintain during at least 6
hours; therefore the individual GMDSS equipment shall be designed for operation with
the supply voltage and frequency (if applicable) delivered by the emergency
switchboard, and if a voltage converter is necessary for the purpose, every individual
GMDSS equipment shall be provided with its own converter.
In this case the reserve source acts only as a transitional source of power.
# In case of 13.2.2 the most important supply in an emergency is coming from the reserve
source of power, which is designed to maintain during at least 6 hours; therefore the
individual GMDSS equipment shall be designed for operation with the supply voltage
and frequency (usually not applicable) delivered by the reserve source of energy which
is usually a battery, and if a voltage converter is necessary for this purpose, every
individual GMDSS equipment shall be provided with its own converter.
In this case the emergency source of electrical power of the ship, not complying with
the provisions of regulation II-1/42 of 43, is considered to be of insufficient reliability for
the emergency supply of the GMDSS equipment.
# In order to obtain the highest possible reliability of the electric supply system, every
connected part of the basic equipment as composed by the equipment required by the
regulations 7, 8, 9, 10 and 11, shall be provided with its own change-over switch in
order to change from normal supply to reserve supply.
NOTE: To determine the electrical load to be supplied by the reserve source of energy for each radio
installation required for distress conditions, the following formula should be applied: • of
the current consumption necessary for transmission (for MF/HF single side band transmission •) +
the current consumption necessary for reception + the current consumption of any additional
loads.
Regulation 13.6, Reserve source of energy being a rechargeable accumulator battery
For the reserve source of energy being a rechargeable accumulator battery, the Notice to the Shipping No.
282/1992, Accumulator storage batteries used as reserve source of power for he radio-installations , has
been issued. In brief this notice provides the following regulations:
1 Only nickel-alkaline, lead-acid or complete maintenance-free storage accumulators may be
used;
2 At least one of the methods of checking mentioned in paragraph 5 shall be applied;
3 The system of the automatic battery charger shall be designed for operation with a
programmed Voltage/Current charging characteristic.
4 The minimum battery capacity is to be calculated with the following formula:
C = K(charge) × K(disch.) × I ,
where
C = Battery capacity in Ah,
K(charge) = 10/7 (or 1,43),
K(disch.) = 10/3, in case of 1 hour battery service
or 10, in case of 6 hours battery service,
and
K(charge) as result of the prescribed automatic charger and the requirement of
charging an empty battery within 10 hours,
K(disch.) as result of the requirement to consider the expected extreme
temperatures for the location of the battery and the reduction of battery capacity
during its lifetime.
5 The yearly battery check can be applied by:
a. measuring the specific gravity of the electrolyte as well as the no-load voltage of
each cell, and applying the formula: Cell voltage = specific gravity + 0,84; or
b. measuring the specific gravity at fully charged condition; or
c. carrying out a load duration test, by which the battery capacity shall be checked by
means of observing the declining course of voltage in relation to a determined
discharging time, using a determined load.
6 The reserve source(s) of energy shall be:
• situated in the highest part of the ship as practical is possible, and
• designed and arranged so that a fire or other casualty inside the spaces containing
the main source of electrical power and other spaces of category A will not
interfere with the good working order of the reserve source of energy.
Regulation 15, Maintenance requirements and availability
The maintenance that the Administration shall ensure according regulation 15.5, and the methods as may be
approved by the Administration according regulations 15.6 and 15.7 among others consist of the following:
* shore based maintenance is mandatory; at sea maintenance capability is no option; and
* duplication of equipment is mandatory for sea areas A3 and A4.
In connection with the aforementioned, legal additions have been issued, which -with regard to the electric
supply system and maintenance- contain the following items:
• The •basic equipment• is defined as composed by the prescribed equipment in compliance with the
regulations 7, 8, 9, 10 and 11;
• The •duplicated equipment• , being the required equipment iin addition to the basic equipment, shall be
able of operating independently from the other radio equipment and shall be provided with its own antenna-equipment. The control of this equipment shall be directly possible on the navigating bridge
near the normal navigation position.
• Like the basic equipment the duplicated equipment shall be able of connecting to the supply from the
reserve source(s) of energy by means of change-over switches.
• The capacity of the reserve source(s) of energy shall be sufficient of supplying those parts of the basic
equipment and the corresponding parts of the duplicated equipment with the greatest power
simultaneously during the period as required by regulation 13.2.1 or 13.2.2.
• The electric supply system for the basic equipment and the duplicated equipment shall be such that a
single failure of the reserve source of energy cannot cause a simultaneous breakdown of the basic
equipment and the duplicated equipment, while the main source of electric power or the emergency
source of electric power is in normal operation.
NSI NOTE
- In order to obtain the highest possible reliability of the electric supply system, every connected part,
whether basic or duplicated equipment, shall be provided with its own change-over switch in order
to change from normal supply to reserve supply; e.g. in case the normal supply for the basic
equipment fails and one of the connected parts of the duplicated equipment is out of order, it will
be
possible to change-over the supply of the corresponding part of the basic equipment to the reserve
electric supply.
V Chapter V: Safety of navigation
NSI INTERPRETATIONS OF SOLAS 1974 CONSOLIDATED EDITION 2001, CHAPTER V, SAFETY
OF NAVIGATION, WITH ADDITIONAL LEGAL REGULATIONS AND N.S.I. NOTES WITH REGARD TO
DESIGN AND PRACTICAL PERFORMANCE OF THE POWER SUPPLY INSTALLATION FOR THE ECDIS
SYSTEM.
The requirements regarding power supply of ECDIS systems (main and back up system) are the same as for
navigation equipment mentioned in regulation V/12 with the addition of the requirement that the ECDIS
and all equipment necessary for its function should not require the equipment to be re-initialized manually
by changing from one source of power supply to another, or any interruption of the supply for a period of
up to 45 s. (IMO Res. A 817(19))
As continuous position-fixing, heading and speed information is required by IMO Res. A 817(19) to ensure
its proper performance, means shall be provided to ensure the continuous supply of such information in the
event of failure of the ship's main source of electrical power by providing for the ECDIS and all equipment
necessary for its function with a transitional source of emergency electrical power as defined in SOLAS
Chapter II-1, regulation 42.4 for at least half an hour.
The existing transitional source of emergency as required in SOLAS regulation II-1/42.4 or 43.4 may be used
or a separated UPS is required.
NSI interpretations:
The transitional source for ECDIS and all equipment necessary for its function shall not interfere the
feeding arrangement from the main source of electrical power in the event of a breakdown of the
transitional source;
* The transitional source for ECDIS and all equipment necessary for its function is not accepted as an
emergency source of electrical power;
* The transitional source of power for ECDIS and all equipment necessary for its function needs a yearly
battery check as mentioned in NOTICE TO THE SHIPPING NO. 282/1992 and shall be done by the
manufacturer or a person authorized by the manufacturer. According manufacturer his specifications
and instructions.
* The transitional source for ECDIS and all equipment necessary for its function shall not be used in
buffer connected service.
* When the transitional source of power is in use, this shall be indicated on the bridge by an audible as
well a visual alarm signal.
Part C Small Vessels
Applying all ships:
a) less than 24 meter
b) less than 500 GT.
c) is used for or destined to be used for a restricted sailing area
of not more than 30 sea miles from the coast.
d) is not a passenger ship engaged in international voyages.
e) is not a passenger ship equipped for voyages of more than
one day.
Contents :
NSI interpretations, additional legal regulations and notes regarding
REGULATION SMALL VESSELS .
GENERAL.
In order to ensure uniformity in the implementation and application of the provisions in respect of electrical
installations the Netherlands Administrations has included the IEC PUBLICATION 92
in the national
legislation by means of issuing the Notice to the shipping no. 204/1986, which means that the electrical
installations have to comply with the relevant standards of:
a) REGULATION SMALL VESSELS;
b) in relation to its design and construction: to the relevant standards/regulation of the classification society;
c) when these standards/regulations do not offer a solution, are too vague or in contradiction with the
objectives and standards of general safety, IEC PUBLICATION 92 is employed as an objective criterion.
CHAPTER IV. REGULATION 37. Main source of electrical power.
It is allowed to trip the services for cooking, heating, domestic refrigeration, mechanical ventilation, sanitary
and fresh water if the total power consumption is calculated to the approved load balance calculation
maintained by one or by no more than two generating sets in parallel.
CHAPTER IV. REGULATION 38. Emergency source of electrical power in passenger and cargo ships.
To fulfil the satisfaction of this Administration linkages, couplings, interfaces between the main switchboard
and the emergency switchboard, remote controls of their prime movers may not interfere the emergency
generator with switchboard, if the main electrical installation is destroyed by fire or other calamity.
For example: The disconnecting or shorting must be obtained automatically by means of using auxiliary
contacts of the bustie breaker in the emergency switchboard or manually by using contacts of a change over
switch in the emergency switchboard for mode •emergency, standby/harbour service off•, both
automatically or manually providing the safe situation of disconnecting and shorting in the emergency
mode.
Other solutions which guarantee the same integrity of the emergency switchboard, are acceptable as well.
According to N.S.I./D.S. the suitable measures to be taken for safeguarding independent emergency
operation under all circumstances in case of using the emergency generator to supply non-emergency
circuits, e.g. as harbour generator during lay time in port consist for example: where the emergency
switchboard is arranged for feed-back operation, before the provisions come into operation caused by
overload, the interconnector feeder between emergency switchboard and main switchboard shall be
disconnected as preference tripping breaker upon overload of the emergency generator.
IEC 60092-302
Clause 7.6.104: Synchronising devices.
In contravention of the IEC-rules, it is allowed, in the case of automation, to omit the required manual
control, if the degree of automation is carried out redundant or multiple.
If manual synchronising, according classification or IEC-rules is required, at least one synchronosscope or
three synchronising lamps or other equivalent means shall be provided.
CHAPTER IV. REGULATION 38-1.2 CABLE ROUTNGS.
This Administration does not allow cables, even not, cables of a fire resisting type, connecting fire pumps to
the emergency switchboard to pass machinery spaces of category A or spaces containing the main source of
electrical power and associated equipment. In addition, all cables or wiring as a part of emergency
equipment such as emergency power, emergency lighting, internal communications or signal shall routed
clear of galleys, laundries, machinery spaces of category A and their casings and other high fire risk areas.
CHAPTER IV. REGULATION 38-3 ECDIS.
It shall be possible to supply power during three hours from the emergency source for operating ECDIS and
all equipment necessary for its normal functioning.
CHAPTER IV. Regulation 41-8.1 BATTERIES:
•Valve regulated batteries• are not accepted or recognized as gas free batteries..
In connection with the high short current of batteries, the battery fuses shall be installed as
near as practicable to the battery. (Maximum distance 3 meters measured from the battery).
CHAPTER IV. REGULATION 42. DECK EQUIPMENT.
1. electrically powered deck equipment for cargo handling equipment of ships registered in 4he
Netherlands or Netherlands Antilles comply with the requirements stated by or on behalf of the
Arbeidsomstandigheden wet. Electrically powered deck equipment for cargo handling equipment of
ships registered in Aruba comply with the requirements stated by or on behalf of the
Stuwadoorsverordening.
2. electrically powered deck equipment for other purposes as aforementioned in paragraph 2.1 must
be constructed in such a way that:
a . starting the driving electric motor is only possible directly from the zero position of the
control handles;
b . upon failure of the electric power supply or interruption of the supply current to the driving
electric motor the brake must automatically come into action and keep the
load. This regulation is not applicable for deck equipment where the brake
has to be manually operated in order to lower the load;
c. in case of application of control current, the occurrence of an earth short in the control
current circuit shall not cause the starting or remaining of running of the
driving electric motor, nor the brake of the winch remaining in the released
position;
d . that the position of the control handle for hoisting and lowering of electrically powered
deck equipment is indicated in a clear and durable way close to that handle;
and
e . a switch or auxiliary switch is fitted at the deck equipment•s control station, enabling to
switch off the electric power supply to the deck equipment concerned
regardless of the position of the control handle.
Equivalent classification rules may replace the aforementioned regulations.
CHAPTER IV. REGULATION 46. LOCK-IN ALARM FOR REFRIGERATION AND FREEZER SPACES.
Where the doors cannot be opened from the inside under all conditions, an alarm system shall be installed,
enabling to activate an audible alarm in a suitable location from the inside of the concerned refrigeration or
freezer space.
FIRE PROTECTION, FIRE DETECTION AND FIRE EXTINCTION .
CHAPTER II. REGULATION 26. FIXED GAS FIRE-EXTINGUISHING SYSTEMS: AUDIBLE WARNING.
According to Notice to the Shipping No. 278/1992, Regulation 6.2 the automatic audible alarm shall be
generated by an electrical driven device. In order to obtain good audibility in all spaces concerned (without
visible signals) under full operational conditions, klaxons or sirens shall be used producing an alarm sound
with variable pitch.
RADIOCOMMUNICATIONS.
CHAPTER II/APPENDIX V. SOURCES OF ENERGY.
For schematic details diagrams and further information see also CIRCULAR 25.
At all times availability of electric supply while the ship is at sea.
NSI interpretation :
In order to fulfil the requirements of this regulation the entire GMDSS installation shall be supplied
by means of a change-over switch on the navigating bridge (preferably automatic), through which
direct electrical supply is possible from the main switchboard and from the emergency switchboard.
Where a ship is not provided with an emergency source of electric power complying fully with all
relevant provisions of SOLAS regulation II-1/42 or 43 (which is generally the case with ships less
than 500 gt and ships built before the 1st of July 1986), electric supply from the emergency
switchboard is not required and the reserve source of energy shall have a capacity for a period of at
least 6 hours.
SOLAS Chapter IV, Radiocommunications
- Regulation 13.2, Reserve source of energy
N.S.I. interpretations:
* The reserve battery shall be used in the event of failure of the ship•s main and emergency
sources of electrical power. Therefore in normal service conditions electric energy is supplied by
the main switchboard, and the reserve battery is only stand-by or being charged by its automatic
battery charger.
* If the main and emergency supply or (in case only) the main supply fail(s), the connected
GMDSS equipment shall be able to be switched over to the reserve battery. So the reserve
battery shall not be used in buffer connected service.
* Supply from the reserve source of energy.
# In case of 13.2.1 the most important supply in an emergency is coming from the emergency
source of electrical power, which is designed to maintain during at least 3 hours; therefore
the individual GMDSS equipment shall be designed for operation with the supply voltage and
frequency (if applicable) delivered by the emergency switchboard, and if a voltage converter
is necessary for this purpose, every individual GMDSS equipment shall be provided with its
own converter.
In this case the reserve source acts only as a transitional source of power.
# In case of 13.2.2 the most important supply in an emergency is coming from the reserve
source of power, which is designed to maintain during at least 6 hours; therefore the
individual GMDSS equipment shall be designed for operation with the supply voltage and
frequency (usually not applicable) delivered by the reserve source of energy which is usually a
battery, and if a voltage converter is necessary for this purpose, every individual GMDSS
equipment shall be provided with its own converter.
In this case the emergency source of electrical power of the ship, not complying with the
provisions of regulation II-1/42 of 43, is considered to be of insufficient reliability for the
emergency supply of the GMDSS equipment.
# In order to obtain the highest possible reliability of the electric supply system, every
connected part of the basic equipment as composed by the equipment required by the
regulations 7, 8, 9, 10 and 11, shall be provided with its own change-over switch in order to
change from normal supply to reserve supply.
NOTE:
To determine the electrical load to be supplied by the reserve source of energy for each radio
installation required for distress conditions, the following formula should be applied: • of the
current consumption necessary for transmission (for MF/HF single side band transmission •) + the
current consumption necessary for reception + the current consumption of any additional loads.
- Regulation 13.6, Reserve source of energy being a rechargeable accumulator battery
For the reserve source of energy being a rechargeable accumulator battery, the Notice to the Shipping No.
282/1992, Accumulator storage batteries used as reserve source of power for the radio-installations , has
been issued. In brief this notice provides the following regulations:
1 Only nickel-alkaline, lead-acid or complete maintenance-free storage accumulators may be
used;
2 At least one of the methods of checking mentioned in paragraph 5 shall be applied;
3 The system of the automatic battery charger shall be designed for operation with a
programmed Voltage/Current charging characteristic.
4 The minimum battery capacity is to be calculated with the following formula:
C = Kcharge × Kdisch. × I ,
where
C = Battery capacity in Ah,
K(charge) = 10/7 (or 1,43),
K(disch.) = 10/3, in case of 1 hour battery service
or 10, in case of 6 hours battery service,
and
K(charge) as result of the prescribed automatic charger and the requirement of
charging an empty battery within 10 hours,
K(disch.) as result of the requirement to consider the expected extreme
temperatures for the location of the battery and the reduction of battery capacity
during its lifetime.
5 The yearly battery check can be applied by:
a. measuring the specific gravity of the electrolyte as well as the no-load voltage of
each cell, and applying the formula: Cell voltage = specific gravity + 0,84; or
b. measuring the specific gravity at fully charged condition; or
c. carrying out a load duration test, by which the battery capacity shall be checked by
means of observing the declining course of voltage in relation to a determined
discharging time, using a determined load.
6 The reserve source(s) of energy shall be:
• situated in the highest part of the ship as practical is possible, and
• designed and arranged so that a fire or other casualty inside the spaces containing
the main source of electrical power and other spaces of category A will not
interfere with the good working order of the reserve source of energy.
- Regulation 15, Maintenance requirements and availability
The maintenance that the Administration shall ensure according regulation 15.5, and the methods as may be
approved by the Administration according regulations 15.6 and 15.7 among others consist of the following:
* shore based maintenance is mandatory; at sea maintenance capability is no option; and
* duplication of equipment is mandatory for sea areas A3 and A4.
In connection with the aforementioned, legal additions have been issued, which -with regard to the electric
supply system and maintenance- contain the following items:
• The •basic equipment• is defined as composed by the prescribed equipment in compliance with the
regulations 7, 8, 9, 10 and 11;
• The •duplicated equipment• , being the required equipment in addition to the basic equipment, shall be
able of operating independently from the other radio equipment and shall be provided with its own
antenna-equipment. The control of this equipment shall be directly possible on the navigating bridge
near the normal navigation position.
• Like the basic equipment the duplicated equipment shall be able of connecting to the supply from the
reserve source(s) of energy by means of change-over switches.
• The capacity of the reserve source(s) of energy shall be sufficient of supplying those parts of the basic
equipment and the corresponding parts of the duplicated equipment with the greatest power
simultaneously during the period as required by regulation 13.2.1 or 13.2.2.
• The electric supply system for the basic equipment and the duplicated equipment shall be such that a
single failure of the reserve source of energy cannot cause a simultaneous breakdown of the basic
equipment and the duplicated equipment, while the main source of electric power or the emergency
source of electric power is in normal operation.
NSI NOTE
- In order to obtain the highest possible reliability of the electric supply system, every connected
part, whether basic or duplicated equipment, shall be provided with its own change-over switch in
order to change from normal supply to reserve supply; e.g. in case the normal supply for the basic
equipment fails and one of the connected parts of the duplicated equipment is out of order, it will be possible to change -over the supply of the corresponding part of the basic equipment to the
reserve electric supply.
CHAPTER III. REGULATION 10 / NAVIGATIONAL AIDS.
ECDIS:
The requirements regarding power supply of ECDIS systems (main and back up system) are the same as for
navigation equipment mentioned in regulation V/12 with the addition of the requirement that the ECDIS
and all equipment necessary for its function should not require the equipment to be re-initialized manually
by changing from one source of power supply to another, or any interruption of the supply for a period of
up to 45 s. (IMO Res. A 817(19))
As continuous position-fixing, heading and speed information is required by IMO Res. A817(19) to ensure
its proper performance, means shall be provided to ensure the continuous supply of such information in the
event of failure of the ship's main source of electrical power by providing for the ECDIS and all equipment
necessary for its function with a transitional source of emergency electrical power as defined in SOLAS
Chapter II-1, regulation 42.4 for at least half an hour.
The existing transitional source of emergency as required in SOLAS regulation II-1/42.4 or 43.4 may be used
or a separated UPS is required.
NSI interpretations:
* The transitional source for ECDIS and all equipment necessary for its function shall not interfere the
feeding arrangement from the main source of electrical power in the event of a breakdown of the
transitional source;
* The transitional source for ECDIS and all equipment necessary for its function is not accepted as an
emergency source of electrical power;
* The transitional source of power for ECDIS and all equipment necessary for its function needs a yearly
battery check as mentioned in NOTICE TO THE SHIPPING NO. 282/1992 and shall be done by the
manufacturer or a person authorized by the manufacturer. According manufacturer his specifications
and instructions.
* The transitional source for ECDIS and all equipment necessary for its function shall not be used in
buffer connected service.
* When the transitional source of power is in use, this shall be indicated on the bridge by an audible as
well a visual alarm signal.