ELECTRICAL INSTALLATIONS
General
(1) In every ship the electrical
installation shall be such that –
(a) all electrical auxiliary services necessary
for maintaining the ship in normal operational and habitable conditions will be
ensured without recourse to the emergency source of electrical power; and
(b) the electrical services essential for safety
will be ensured under emergency conditions.
(2) 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.
Main
source of electrical power and main switchboard
(1) Every ship in which electrical power is
the only power for maintaining auxiliary services essential for the propulsion
or safety of the ship shall be provided with two or more generating sets of
such power that these services can be operated when any one of the sets is out
of service.
(2) Load
shedding or other equivalent arrangements shall be provided to protect the
generators required by subregulation (1) against sustained overload.
Additional
requirements for ships constructed on or after 1 September 1984
(3) (a) A main source of electrical power shall be
provided in every such ship with sufficient capacity to supply all the services
required by regulation 48(1)(a) and (b) and this main source of electrical
power shall consist of at least two generating sets.
(b) The main source of electrical power shall be
arranged so that such services can be maintained regardless of the speed and
direction of rotation of the propulsion machinery or shafting.
(4) The
arrangement of the generating sets required by subregulation (3) shall be such
that with any one of the sets out of service –
(a) normal operational conditions of propulsion
and safety of the ship and minimum comfortable conditions of habitability
including those for cooking, heating, domestic refrigeration, mechanical
ventilation, sanitary and fresh water can be maintained; and
(b) from a dead ship condition, the remaining
sets are capable of providing the electrical services necessary to start the
main propulsion plant and the emergency source of electrical power may be used
for this purpose if it is capable of simultaneously supplying the emergency
supplies required by Part 3 in the Twelfth Schedule, or it is capable of
supplying such services when combined with any other source of electrical
power.
(5) Any
transforming equipment supplying an electrical system referred to in this regulation
shall be arranged to ensure the same continuity of supply as that required for
generating sets by this regulation.
(6) (a) The main switchboard shall be located in the
same main fire zone and watertight compartment as the main generating sets in
any ship with only one generating station.
(b) Where there is more than one generating
station and only one main switchboard, that switchboard shall be located in the
same main fire zone and watertight compartment as one of the generating
stations.
(c) The Administration may permit other
arrangements where other essential features of the ship render the application
of this requirement impracticable subject to such alternative provisions as it
may require.
(d) For the purposes of this subregulation an
environmental enclosure for the main switchboard such as a machinery control
room within the main boundary of the space, does not provide separation between
the generating sets and switchboards.
(7) (a) The main busbars shall be subdivided in every
ship in which the total installed electrical power of the main generating sets
exceeds 3 megawatt.
(b) Each section of the busbars shall be
interconnected by removable links or other suitable means such that the main
generating sets and any supplies to duplicated services which are directly
connected to the busbars are, so far as it is practicable, equally divided
between the sections.
(c) The Administration may permit other
arrangements which provide equivalent system redundancy.
Additional requirements for
ships constructed on or after 1 July 1998
(8) (a) Where the main source of electrical power is
necessary for propulsion and steering of the ship, the system shall be so
arranged that the electrical supply to equipment necessary for propulsion and
steering and to ensure safety of the ship will be maintained or immediately
restored in the case of loss of any one of the generators in service.
(b) Where the main source of electrical power is
necessary for propulsion of the ship, the main busbar shall be subdivided into
at least two parts which shall normally be connected by circuit breakers or
other approved means and so far as is practicable, the connection of generating
sets and other duplicated equipment shall be equally divided between the parts.
(9) A
ship complying with subregulation (8) need not comply with subregulation (7).
Requirements for ships
constructed on or after 1st September 1984
Lighting
systems
(1) The main source of electrical power in
every ship shall be capable of illuminating any part of the ship normally
accessible to and used by the passengers or the crew.
(2) The
emergency electric lighting shall be arranged so that a fire or other casualty
in spaces containing the emergency source of electrical power, the associated
transformers, if any, the emergency switchboard and the emergency lighting
switchboard will not render inoperative the main electric lighting system as
required by subregulation (1).
(3) Lighting
fittings shall be arranged to prevent rises in temperature which would be
damaging to the fitting or the electric wiring or which would result in a risk
of fire.
Emergency
and transitional sources of electrical power and emergency switchboards
53. (1) Every ship shall be provided, in a
position above the uppermost continuous deck and outside the machinery casings,
with a self-contained emergency source of electrical power so arranged as to
ensure its functioning in the event of fire or other casualty causing failure
of the main electrical installation.
(2) The
emergency and transitional source of electrical power and emergency
switchboards shall be in accordance with the provisions of the Twelfth
Schedule.
Additional requirements for
ships constructed on or after 1 July 1998
(3) Where
electrical power is necessary to restore propulsion, the capacity shall be
sufficient to restore propulsion to the ship in conjunction with other
machinery, as appropriate, from a dead ship condition within 30 minutes after
blackout.
Requirements for ships constructed on or
after 1 September 1984
Location
and construction of cables
54. (1) (a) All
electrical cables external to equipment shall be flame retardant and shall be
installed so that their flame retarding or equivalent properties are not
impaired.
(b) The Administration may permit installation of
cables which do not comply with the foregoing for particular purposes, such as
radio frequency cables, where compliance would be impracticable.
(2) Cables
shall be installed and supported in such a manner as to avoid chafing and other
damage and all metal sheaths and metal armour of electric cables shall be
electrically continuous and shall be earthed except that the Administration may
permit such earthing to be omitted for particular purposes.
(3) Cables
serving emergency services shall not, so far as is practicable, be routed
through galleys, laundries, machinery spaces of Category A and their casings or
other high risk areas except insofar as it is necessary to provide emergency
services in such areas and cables connecting fire pumps to the emergency
switchboard shall be of a fire resistant type where they pass through high fire
risk areas.
(4) Cables
serving emergency services shall, where practicable, be installed in such a
manner as to preclude them being rendered unserviceable by the effect of a fire
in an adjacent space and subsequent heating of the dividing bulkhead.
(5) The
electrical, mechanical, flame retarding and, where applicable, fire resisting
properties of the terminations and joints in any conductor shall be at least
equivalent to those of the conductor.
Requirements for ships
constructed on or after 26 May 1965
General
precautions against shock, fire and other hazards
. In
every ship all electrical equipment shall be constructed and installed so that
it will not cause injury when handled or touched in a proper manner. The
precautions to be taken shall at least be in accordance with those set out in
the Thirteenth Schedule.
Requirements for ships
constructed on or after 1st September 1984
Electrical
equipment in hazardous areas and spaces
Electrical
equipment shall not be installed in any hazardous area except in accordance
with the requirements set out in the Fourteenth Schedule.
1 comments:
Electricity needs a little care. So, we have to hire licensed commercial & domestic electricians, local industrial electricians for electricity. Along with of that, we have to use good Quality of products of electricity, as well.
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