Infra-red photometry techniques may be employed to assist with this assessment. The measurement of the resistance of joints and contacts by volt drop methods with the injection of high current from a low voltage source is also recommended. Records should be taken of the readings for subsequent reference.
These techniques may be used at the initial examination and for periodic inspections.
Switches and circuit-breakers should be operated on load and the satisfactory operation of all interlocks is to be demonstrated：
Prior to commencing tests of protective devices, their size, type and ratings should be checked against the design. The operation of protective relays and devices should be effectively demonstrated, which may be by the use of suitable injection testing techniques. Direct acting overcurrent relays can only be tested by primary injection methods but secondary injection may be acceptable elsewhere when the associated current transformers and circuitry should also be tested.
(2) All generator sets should be run over a sufficient range of load, including full rated load, or as near as is practicable to full rated load, and for a duration sufficient to demonstrate that commutation, electrical characteristics, governing, range of excitation control, phase rotation, lubrication and absence of excessive vibration are satisfactory.
If sets are intended to operate in parallel, they should be tested over a range of loads to demonstrate their compliance with the specified requirements.
The voltage and speed regulation when a specified load is suddenly thrown on and off should be satisfactory to previously defined limits.
Overspeed trips together with all other devices relative to the protection of the generator sets should be demonstrated to show that they are satisfactory.
Synchronising equipment and any associated protective devices should be demonstrated to verify correct functioning between each generating set and all other generating sets intended to operate in parallel. Reverse current, reverse power and overcurrent trips and any other safety devices should be satisfactorily demonstrated.
(3) Each motor, together with its control gear, should be tested to prove the wiring and direction of rotation and then run as near as practicable to service conditions for a sufficient length of time to demonstrate that alignment, speed range, commutation, rated output and operating characteristics are satisfactory.
(4) All electrical devices and circuits, including lighting, heating and galley equipment, should be tested under operating conditions to verify that they are suitable and satisfactory for their purposes.
(5) Each communications system and alarm system should be thoroughly tested to determine its suitability and to verify its specified functioning.
(6) Equipment installed to implement relevant Statutory requirements should be tested to ensure that all such requirements have been met. Where operation is required to be maintained from emergency sources of power, including automatic transfer of circuits to such emergency sources, correct functioning from and by such emergency supplies should be tested and the duration of the emergency supplies, where specified, should also be verified.
(7) All equipment, including radio communication equipment, radio navigation aids, depth-sounding and broadcasting apparatus, should be tested for the purpose of detecting harmful interference. If objectionable interference is found, it should be reduced by suitable means to the level prescribed in the relevant standards.
(8) Batteries should be subjected to an initial test to demonstrate their ability to supply their design loads for the duration required. The associated charging system for each battery should also be verified.
NOTE： Regular testing to demonstrate this capability should be carried out in accordance with the manufacturer's recommended procedures.
(9) The ventilation arrangements of vented type battery installations should be inspected to ensure that they are in accordance with the relevant IEC Standard; the arrangements for valve regulated sealed battery installations should comply with the relevant IEC Standard. Ventilation air flow should be tested to confirm that at least the minimum quantity is obtained.
(10) Attention is drawn to the special tests for propulsion equipment which are detailed in the relevant IEC Standard.
8 The appropriate ratings of fuses and the settings of adjustable protection devices and the full load current of the generator or cables protected should be indicated.
