for connection to portable utilization equipment, including lamps operating at more than 8 volts between conductors, shall be of a type approved for extra hard usage in accordance with Table 400.4 and shall include an additional conductor for grounding.
(7) Flexible Cord Storage. A storage device for the flexible cord shall be provided and shall not subject the cord to bending at a radius of less than 75 mm (3 in.).
(B) Above Hazardous (Classified) Anesthetizing
Locations.
(1) Wiring Methods. Wiring above a hazardous (classified) location referred to in 517.60 shall be installed in rigid metal conduit, electrical metallic tubing, intermediate metal conduit, Type MI cable, or Type MC cable that employs a continuous, gas/vaportight metal sheath.
(2) Equipment Enclosure. Installed equipment that may produce arcs, sparks, or particles of hot metal, such as lamps and landholders for fixed lighting, cutouts, switches, generators, motors, or other equipment having make-and-break or sliding contacts, shall be of the totally enclosed type or be constructed so as to prevent escape of sparks or hot metal particles.
Exception: Wall-mounted receptacles installed above the hazardous (classified) location in flammable
anesthetizing locations shall not be required to be totally enclosed or have openings guarded or screened to prevent dispersion of particles.
(3) Luminaires. Surgical and other luminaires shall con form to 501.130(B).
Exception No. I: The surface temperature limitations set forth in 50J. 130(B)(1) shall not apply.
Exception No. 2: Integral or pendant switches that are located above and cannot be lowered into the hazardous (classified) locations) shall not be required to be explosionproof.
(4) Seals. Listed seals shall be provided in conformance with 501.15, and 501.15(A)(4) shall apply to horizontal as well as to vertical boundaries of the defined hazardous (classified) locations.
(5) Receptacles and Attachment Plugs. Receptacles and attachment plugs located above hazardous (classified) anesthetizing locations shall be listed for hospital use for services of prescribed voltage, frequency, rating, and number of conductors with provision for the connection of the grounding conductor. This requirement shall apply to attachment plugs and receptacles of the 2-pole, 3-wire grounding type for single-phase, 120-volt, nominal, ac service.
(6) 250-Volt Receptacles and Attachment Plugs Rated 50 and 60 Amperes. Receptacles and attachment plugs rated 250 volts, for connection of
50-ampere and 60-ampere ac medical equipment for use above hazardous (classified) locations, shall be arranged so that the 60- ampere receptacle will accept either the 50-ampere or the 60-ampere plug. Fifty-ampere receptacles shall be designed so as not to accept the 60-ampere attachment plug. The attachment plugs shall be of the 2-pole, 3-wire design with a third contact connecting to the insulated (green or green with yellow stripe) equipment grounding conductor of the electrical system.
(C) Other-Than-Hazardous (Classified) Anesthetizing
Locations.
(1) Wiring Methods. Wiring serving other-than- hazardous (classified) locations, as defined in 517.60, shall be in stalled in a metal raceway system or cable assembly. The metal raceway system or cable armor or sheath assembly shall qualify as an equipment grounding conductor in accordance with 250.118. Type MC and Type MI cable shall have an outer metal armor, sheath, or sheath assembly