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Oceangoing Cargo Ships Safety & Operational Matters
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Work on electrical systems and safety guideline for cargo ships

Work on electrical systems and equipment onboard a cargo ship is considered a specialized work. It must be undertaken only by qualified personnel from the ship's staff or shore contractors. Work on electrical equipment in an area where an explosive atmosphere may be present requires special precautions and the Master's permission. He should ensure that qualified persons are doing the work, in compliance with regulations in force and with adequate safety precautions in place. The Master shall ensure that personnel is supervised and all measures are taken to avoid any fatalities. Reference is to be made to the relevant sections of the Safety and Environmental Procedures.

Electrical equipment and installation: Surveyors should ensure that the details and arrangements of the electrical equipment and its installation comply with the statutory regulations. Generators, motors, and transforming equipment intended for services in connection with the propulsion and safety of the ship should be inspected during construction. The works and shipboard tests should also be personally supervised. Machines and transforming equipment of less than 100kW could be accepted without a survey at the manufacturing works if satisfactory maker's test certificates are supplied, detailing the tests' results to determine the operating characteristics, temperature rise, insulation resistance, and dielectric strength.



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Where reasonably practicable, installations and equipment should be designed and located such that services that are essential for the propulsion and safety of the ship will not fail in the event of partial flooding of the ship's machinery space. Due consideration should be given to space limitations and the intended service of the ship. The load shedding, or other arrangements provided, should not interfere with the supply to electrical services, which are essential for the propulsion and safety of the ship and which must be maintained after shedding non-essential loads. The essential services include those auxiliaries necessary for propulsion, bilge, and fire pumping, navigation lights, essential lighting, steering gear, navigational aids required by the Merchant Shipping Regulations, communication and alarm systems required for safety, watertight doors and engine and boiler room ventilation.

Explained below a brief guideline on the electrical system and work requirement: Summarized below are some essential check items before doing any electrical maintenance job. These procedures are only indicative, not exhaustive, and must always be guided by practices of good seamanship.
  1. Checklist for Electrical work on High Voltage Equipment (over 1000V) (to be completed by responsible person)

  2. Has pre-meeting been held and personnel clearly instructed of work scope, procedure, and precautions?

  3. Our working personnel aware that some circuits in the equipment may be on even if the power supply is off?

  4. Is the integrity of cords of portable lamps and electrical tools confirmed and are they properly grounded?

  5. Are personnel carrying out the work, aware of the measures to be taken to treat electrical shock?

  6. If handling electrolytic liquid, are anti-acid gloves, apron, protective eyeware etc available?

  7. Have other permit to work systems been followed as necessary?

  8. Is the concerned equipment dead and isolated from the system?

  9. Isolation points: Have circuit main earths been applied to the equipment?

  10. Application points: Have safety locks been fitted?

  11. Locations/Lockset identities: Have caution/danger notices been applied to all isolation points and safety signs appropriately positioned?

TREAT ALL OTHER APPARATUS AND AREAS AS DANGEROUS!


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