0, receptacles, attachment plugs, connectors, and similar devices

shall be of the grounding type, and the grounded conductor of the flexible cord shall be connected to the screw shell of any lampholder or to the grounded terminal of any utilization equipment supplied. Approved means shall be provided for maintaining continuity of the grounding conductor between the fixed wiring system and the noncurrent-carrying metal portions of pendant fixtures, portable lamps, and portable utilization equipment. 513-5. Equipment Not Within Class I Locations. (a) Arcing Equipment. In locations other than those described in Section 513-2, equipment that is less than 10 feet (3.05 m) above wings and engine enclosures of aircraft and that may produce arcs, sparks, or particles of hot metal, such as lamps and lampholders for fixed lighting, cutouts, switches, receptacles, charging panels, generators, motors, or other equipment having make-and-break or sliding contacts, shall be of the totally enclosed type or so constructed as to prevent escape of sparks or hot metal particles. Exception: Equipment in areas described in Section 513-2(d) shall be permitted to be of the general-purpose type. (b) Lampholders. Lampholders of metal-shell, fiber-lined types shall not be used for fixed incandescent lighting. (c) Portable Lighting Equipment. Portable lighting equipment that are used within a hangar shall be approved for the location in which they are used. (d) Portable Equipment. Portable utilization equipment that is or may be used within a hangar shall be of a type suitable for use in Class I, Division 2 locations. 513-6. Stanchions, Rostrums, and Docks. (a) In Class I Location. Electric wiring, outlets, and equipment (including lamps) on or attached to stanchions, rostrums, or docks that are located or likely to be located in a Class I location as defined in Section 513-2(c) shall comply with the requirements for Class I, Division 2 locations. (b) Not in Class I Location. Where stanchions, rostrums, or docks are not located or likely to be located in a Class I location as defined in Section 513-2(c), wiring and equipment shall comply with Sections 513-4 and 513-5, except that such wiring and equipment not more than 18 inches (457 mm) above the floor in any position shall comply with (a) above. Receptacles and attachment plugs shall be of a locking type that will not readily disconnect. 70-508 NATIONAL ELECTRICAL CODE (c) Mobile Type. Mobile stanchions with electric equipment complying with (b) above shall carry at least one permanently affixed warning sign to read: "WARNING - KEEP 5 FEET CLEAR OF AIRCRAFT ENGINES AND FUEL TANK AREAS." 513-7. Sealing. Approved seals shall be provided in accordance with