Electrical troubleshooting and maintenance

46 CFR §111.01-3

§ 111.01-3 -3 Placement of equipment. (a) Electric equipment must be arranged, as far as practicable, to prevent mechanical damage to the equipment from the accumulation of dust, oil vapors, steam, or dripping liquids. (b) Apparatus that may arc must be ventilated or be in ventilated compartments in which flammable gases, acid fumes, and oil vapors cannot accumulate. Skylights and ventilators must be arranged to prevent flooding of the apparatus.

46 CFR §111.01-7

§ 111.01-7 -7 Accessibility and spacing. (a) The design and arrangement of electric apparatus must afford accessibility to each part as needed to facilitate proper inspection, adjustment, maintenance, or replacement. (b) Within an enclosure, the spacing between energized components (or between an energized component and ground) must be to the appropriate industry standard for the voltage and current utilized in the circuit. Additionally, spacing within any enclosure must be sufficient to facilitate servicing. [CGD 94-108, 61 FR 28275, June 4, 1996]

46 CFR §111.05-23

§ 111.05-23 -23 Location of ground indicators. Ground indicators must: (a) Be at the vessel's ship's service generator distribution switchboard for the normal power, normal lighting, and emergency lighting systems; (b) Be at the propulsion switchboard for propulsion systems; and (c) Be readily accessible. (d) Be provided (at the distribution switchboard or at another location, such as a centralized monitoring position for the circuit affected) for each feeder circuit that is isolated from the main source by a transformer or other device. Note to paragraph ():An alarm contact or indicating device returned to the main switchboard via a control cable, that allows the detecting equipment to remain near the transformer or other isolating device for local troubleshooting, is allowed. [CGD…

46 CFR §111.95-3

§ 111.95-3 -3 General requirements. (a) Each electrical component (e.g., enclosure, motor controller, or motor) must be constructed to the appropriate NEMA or IEC degree of protection requirement for the service and environment in which it is installed. (b) Each main line emergency disconnect switch, if accessible to an unauthorized person, must have a means to lock the switch in the open-circuit position with a padlock or its equivalent. The switch must not lock in the closed-circuit position. [CGD 94-108, 61 FR 28283, June 4, 1996]

46 CFR §183.200

§ 183.200 General design, installation, and maintenance requirements. Electrical equipment on a vessel must be installed and maintained to: (a) Provide services necessary for safety under normal and emergency conditions; (b) Protect passengers, crew, other persons, and the vessel from electrical hazards, including fire, caused by or originating in electrical equipment, and electrical shock; (c) Minimize accidental personnel contact with energized parts; and (d) Prevent electrical ignition of flammable vapors.

DOE-HDBK-1011 Vol.4 §15-3

DOE-HDBK-1011 Vol.4 §15-3 — System grounding and ground detection Grounding connects parts of the electrical system, or equipment enclosures, to the ship's hull/earth reference for safety and for controlled operation of protection. Two distinct concepts apply. Equipment grounding bonds all non-current-carrying metal (motor frames, enclosures, conduit) together and to ground so that a winding-to-frame fault cannot leave the frame energized at a dangerous voltage; the fault current instead returns through the ground path and trips protection, and the bonding also drains static charge. System grounding concerns whether a current-carrying conductor (typically the neutral) is intentionally connected to ground. Many shipboard power systems are operated ungrounded (an ungrounded delta), so that …