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PREVIOUS | TABLE OF CONTENTS | NEXT 33. Initial Testing and Inspection Onboard Ship33.1 The initial inspection, which may consist of a series of inspections during the construction of the vessel, shall include a complete inspection of the electrical installation and electrical equipment or apparatus. The inspection shall be such as to ensure that the arrangement, materials and installations thereof, fully comply with the applicable section of this Standard and are in accordance with approved plans. The inspection shall also be such as to ensure that the workmanship of all equipment and apparatus and the installation thereof is, in all respects, satisfactory. 33.2 The insulation resistance shall be measured by self-contained instruments such as a direct reading ohmmeter of the generator type, applying a voltage of at least 500 volts. When an insulation test is made on a circuit incorporating capacitors of a total capacitance exceeding 2 microfarads, an insulation tester of the constant-voltage type should be used. 33.3 Before switchboards, motor control centres and distribution panels are put into service, their insulation resistance shall be not less than 1 megohm when measured between each bus-bar and ground and between each insulated bus-bar and the bus-bar connected to the other pole or poles; this test shall be made with all circuit breakers and switches open and all fuse-links for pilot lamps, ground indicating lamps, voltmeters, etc. removed and voltage coils temporarily disconnected. 33.4 On all lighting and power circuits, a test for insulation resistance between all insulated poles and ground and, where practicable, between poles shall be applied to all permanent wiring. 33.5 Each circuit should have an insulation resistance between conductors and between each conductor and ground of not less than the following:
33.6 All generating sets shall be run until constant temperature has been reached, after which commutation, electrical characteristics, overspeed trips, governing, range of excitation control, lubrication and absence of vibration shall be satisfactorily demonstrated. 33.7 The insulation resistance of all generators shall be measured both in the cold condition and in the warm condition immediately before and after running at normal full load. 33.8 All switchgear shall be loaded as nearly as practicable to its full load and no overheating shall take place due to faulty connections or incorrect rating. Those vessels with an aggregate connected load of 500 kW or more shall conduct a thermal scan of the switchboard main connections and bus work together with the generator connections and transformers above 10 kVA. 33.9 Switches and circuit breakers shall be operated on load and, where practicable, operation of their over-current, under-voltage and auxiliary trip units satisfactorily demonstrated. 33.10 Reverse power relays, reverse current relays, preferential tripping relays and all electrical and electro/mechanical interlocks shall be satisfactorily operated. 33.11 Each motor with all its associated control equipment shall be run under operating conditions for a sufficient length of time to demonstrate correct alignment, wiring, capacity, speed, and satisfactory operation; motors driving pumps, ventilation fans, and similar loads shall be operated as nearly as practicable under their individual service conditions; motors driving cargo winches shall hoist and lower their specified loads; motors driving warping capstans, machine tools, and other similar machines, shall be run to demonstrate suitability. 33.12 The remote control units for stopping ventilation fans, oil pumps and pumps discharging overboard in way of survival craft shall be satisfactorily operated. 33.13 Tests shall be carried out on power and lighting circuits to verify that the allowable voltage drop, as specified in Section 5.1 (b) of this standard has not been exceeded; circuits shall be operated as nearly as is practicable, at their full load rating during these tests. 33.14 Where the power developed by the main propulsion units is transmitted to the propeller by means of generators and motors:
33.18 Electric cable shall be checked during installation for size and type as shown on the approved plans; the adequacy of cable supports shall be checked and it shall be ascertained that no cable is installed in the proximity of steam pipes or other hot objects and that the cables have not been damaged during the installation due to excessive pulling force having been applied, or due to bends or sharp or rough edges of cable supports or bulkhead penetrations or similar abrasions; cable penetrations required to be watertight shall be checked for proper packing of the terminal or stuffing tubes. 33.19 Rotating electrical machinery shall be checked to assure that rotating and/or un-insulated parts are adequately shielded from accidental contact by personnel. 33.20 Switchboards shall be checked for hand-rails, guard-rails, working spaces, insulating floor covering, drip covers and enclosures for backs and ends; switchboard mounted apparatus shall be checked for identifying nameplates; circuit nameplates shall be compared with the rating or setting of the overcurrent devices and with the approved plans; the accessibility of items requiring maintenance or adjustment shall be checked; meters shall be checked for proper operation; the operation of automatic switchgear and mechanical and electrical interlocks shall be observed. 33.21 Motor starters shall be checked to ensure proper starting of the motor under service conditions and that properly rated overcurrent devices are installed; each motor starter not completely disconnected from all sources of potential when the disconnect switch is opened (due to electrically interlocked circuits necessary for proper operation of the apparatus or for other valid reasons) shall be checked to ensure that attention is directed to such conditions by a suitable warning. 33.22 The accessibility of electrical apparatus for normal inspection and maintenance shall be observed; the accessibility of junction boxes and the like in way of panelling shall be noted during construction of a vessel; hinged doors of motor starters and similar apparatus shall be checked for interference with adjacent structural parts or apparatus. 33.23 It shall be determined that metal enclosures for electrical equipment are grounded, either by the method of mounting or by ground leads; portable equipment shall be checked for grounding through one conductor of the supply cable. 33.24 All propulsion and auxiliary machinery control and safety systems installed to comply with the requirements for an automated machinery system or an unmanned machinery space shall be checked for material condition and operation. 33.25 Storage batteries used for ship's service and emergency diesel driven generator starting and diesel driven main engine starting shall be checked for capacity; the batteries shall have sufficient capacity without recharging to provide not less than twelve consecutive starts of each main engine if of the reversible type and not less than six consecutive starts if of the non?reversible type; for diesel driven generators, not less than six consecutive starts. 33.26 Electric re-heat systems are to be checked for normal operation; overheat cut-outs are to be checked for proper operation and temperature rating; electrical connections are to be checked to ensure that they are tight; the interior of re-heat boxes is to be checked to ensure that they are free from excessive amounts of combustible dust. 34. Periodic Inspections ^ 34.1 The inspection of electrical installations at the periodic inspection incident to re?issuance of a safety certificate of inspection shall include an inspection of all items enumerated in Section 33.1 and 33.6 to 33.25 inclusive to the extent necessary to determine mechanical and electrical condition and performance and as per the applicable subsection of this chapter; particular note shall be made of circuits added or modified after the initial inspection. 34.2 All repairs, additions alterations are undertaken; shall comply with the approved plans. 34.3 Where the control of the propulsion machinery or the propeller is effected by electric or electronic means a complete inspection of the control system shall be conducted annually. 34.4 Where appropriate, in the interest of safety, more frequent inspections should be carried out. 34.5 Where the main source of electrical power is used for supplying power for lighting purposes only:
34.10 The operation of electric and electro/hydraulic steering gear shall be tested with particular attention paid to the functioning of the motor overload alarm, motor stopped indication and supply circuit breaker tripped alarm, also the setting of switches or links on the transfer panel where applicable. 34.11 Generator circuit breakers for generators rated 100 kW and above shall be tested every five years to verify initial trip settings and satisfactory operation; the tests may be conducted using either primary or secondary injection methods; if the test is performed by secondary injection the integrity of all the circuit breaker's associated current transformers is to be verified on a ten year periodicity. The actual generator circuit breaker settings shall be permanently indicated in an accessible position within each circuit breaker compartment |
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