10.2.1 An
electrical insulation resistance test is to be made on the electrical
equipment and cables. The installation may be sub-divided, or equipment
which may be damaged disconnected, for the purpose of this test.
10.2.2 The
fittings on the main and emergency switchboards, section boards and
distribution boards are to be examined and over-current protective
devices and fuses inspected to verify that they provide suitable protection
for their respective circuits.
10.2.3 Generator
circuit-breakers are to be tested, so far as is practicable, to verify
that protective devices including preference tripping relays, if fitted,
operate satisfactorily.
10.2.4 Air
circuit-breakers for essential or emergency services and rated at
800 A and above are to be inspected to ensure that the manufacturer’s
recommended number of switching options has not been exceeded. See
Vol 2, Pt 9, Ch 3, 5.3 Circuit-breakers 5.3.6. Where
a breaker is not fitted with an automatic counter, a written record
is to be kept.
10.2.5 The
electric cables and their securing arrangements are to be examined,
so far as is practicable, without undue disturbance of fixtures or
casings unless opening up is considered necessary as a result of observation
or of the tests required by Vol 1, Pt 1, Ch 3, 10.2 Complete Surveys 10.2.1 The
Surveyor is also to be satisfied regarding the condition of glands
at watertight and gastight bulkheads.
10.2.6 The
generator prime movers are to be surveyed as required by Vol 1, Pt 1, Ch 3, 8 Turbines – Detailed requirements and Vol 1, Pt 1, Ch 3, 9 Reciprocating internal combustion engines – Detailed requirements and the governing of the engines tested. The motors concerned
with essential services together with associated control and switch
gear are to be examined and if considered necessary, are to be operated,
so far as is practicable, under working conditions. All generators
and steering gear motors are to be examined and are to be operated
under working conditions, though not necessarily under full load or
simultaneously.
10.2.7 Where
transformers associated with supplies to essential services are liquid
immersed, the Owner is to arrange for samples of the liquid to be
taken and tested for dissolved gases, breakdown voltage, acidity and
moisture, by a competent authority, in accordance with the equipment
manufacturer’s requirements, and a certificate giving the test
results is to be made available to the Surveyor on request.
10.2.8 Navigation
light indicators are to be tried under working conditions, and correct
operation on the failure of supply or failure of navigation lights
verified.
10.2.9 The
emergency sources of electrical power, where fitted, together with
their automatic arrangements and associated circuits are to be tested.
10.2.10 Emergency
lighting, transitional emergency lighting, supplementary emergency
lighting, general emergency alarm and public address systems are to
be tested as far as practicable.
10.2.11 Where
the ship is electrically propelled, the propulsion motors, generators,
propulsion transformers, propulsion conversion equipment, cables,
harmonic filters, neutral earthing resistors, dynamic braking resistors
and all ancillary electrical equipment that forms part of the propulsion
drive and control system, exciters and ventilating plant (including
coolers) associated therewith are to be surveyed, and the insulation
resistance to earth is to be tested. Special attention is to be given
to windings, commutators and sliprings. Where practicable, the low
voltage and high voltage windings of cast resin propulsion transformers
are to be subjected to boroscopic inspection, to assess the physical
condition of their insulation and for signs of mechanical and thermal
damage. The operation of protective gear and alarm devices is to be
checked, so far as is practicable. Insulating oil, if used, is to
be tested in accordance with Vol 1, Pt 1, Ch 3, 10.2 Complete Surveys 10.2.7.
Interlocks intended to prevent unsafe operations or unauthorised access
are to be checked to verify that they are functioning correctly. Emergency
overspeed governors are to be tested.
10.2.12 Where the ship has high voltage electrical equipment and associated cables used for Ship
Type and Mobility systems, the Surveyor is to visually examine the condition of their
insulation systems for signs of deterioration, including partial discharge activity.
Where deemed necessary by the Surveyor, boroscopic and/or endoscopic inspections are to
be conducted. Areas to be considered for examination are to include, but are not limited
to:
- winding ends of all high voltage electrical machines;
- electrical motor core laminations; stator wedges; stator bars; space blocks; and
connection rings;
- terminal connections of high voltage equipment; and
- high voltage cable connections.
10.2.14 A
General Examination of the electrical equipment in areas which may
contain flammable gas or vapour and/or combustible dust is to be made
to ensure that the integrity of the safe type electrical equipment
has not been impaired owing to corrosion, missing bolts, etc. and
that there is not an excessive build-up of dust on or in dust protected
electrical equipment. Cable runs are to be examined for sheath and
armouring defects, where practicable, and to ensure that the means
of supporting the cables are in good order. Tests are to be carried
out to demonstrate the effectiveness of bonding straps for the control
of static electricity. Alarms and interlocks associated with pressurised
equipment or spaces are to be tested for correct operation.
10.2.15 Where batteries with a connected charging device exceeding 2kW provide the source of
power for any Mobility or Ship Type systems their installation, including charging and
ventilation arrangements, is to be examined.
10.2.16 Sufficient battery capacity shall be verified for Lithium-Ion battery system
installations used as the primary power source for emergency systems.
10.2.17 Where Lithium-Ion batteries with total system capacity exceeding 20 kWh are
used as the primary power source for Mobility or Ship Type systems a test of all
required monitoring and safety functions shall be carried out.
10.2.18 A test of the safety functions in spaces or compartments containing
Lithium-Ion batteries with total system capacity exceeding 20 kWh shall be carried out,
i.e. fire detection and extinguishing, gas detection, ventilation etc. as applicable to
the installation.
10.2.19 The safety aspects of spaces or compartments containing Lithium-Ion
batteries used as a power source are to be examined as applicable to the installation.
This should include examinations of the following, as relevant:
- structural fire protection;
- fixed fire detection;
- fixed fire-fighting system(s);
- ventilation and associated dampers;
- off-gas detection, exhaust and/or extraction arrangement;
- integrity of battery crates, trays, boxes, shelves and other structural parts;
- battery cooling arrangement;
- electrical power cabling, switchgear and converters; and
- EEBDs (emergency escape breathing devices) and means of escape.