Section R. 408.41466 - Electrical requirementsRule 1466.
(1) A power line shall be well separated or insulated from water lines, telephone lines, and air lines.(2) Lighting circuits shall be located so that the movement of personnel or equipment will not damage the circuits or disrupt service.(3) Electrical equipment and wiring shall be installed and maintained as prescribed in the provisions of subparts F to J of part 77 of the provisions of 30 C.F.R., Mineral Resources, Parts 1-199 "Mine Safety and Health Administration, Department of Labor," as adopted in R 408.41410. The provisions of subparts F to J are adopted with the following amendments: (a) Article 305-1(a) is amended to read as follows: Temporary electrical power and lighting installations shall be permitted during the period of construction, remodeling, maintenance, repair, or demolition of buildings, structures, equipment, or similar activities which are located at ground level and which are part of facilities used for the construction of tunnels, shafts, and cofferdams.(b) Article 310-15, is amended to read as follows: The maximum continuous ampacities for copper, aluminum, and copper-clad aluminum conductors shall be as specified in table 310-16 to 310-19 and accompanying notes 1 to 12. Power and lighting circuits may be loaded to the maximum design temperatures of the wire or cable insulation under the following conditions: (i) A means shall be provided to disconnect the load if the feeder cable exceeds design temperature by more than 10% for 1 minute.(ii) Power cable shall have a grounding and a pilot wire that conforms to the Insulated Power Cable Engineers Association (IPCEA) type G grounded cable (G-GC) or equivalent.(iii) Power cable shall have a loose connector emergency shutdown ability.(iv) Power cable shall have a ground fault emergency shutdown ability.(v) Power cable shall have an arc between phases emergency shutdown ability.(c) Oil filled transformers shall not be used underground unless they are located in a fire-resistant enclosure suitably vented to the outside and surrounded by a dike to retain the contents of the transformer in the event of rupture.(4) All electrical power circuits that supply portable or hand-held tools, lights, or equipment shall be protected by approved ground-fault interrupters as prescribed in Construction Safety Standard Part 17 "Electrical Installations," as referenced in R 408.41410.(5) The regular system of illumination shall be supplemented by lighting that can be activated upon the failure of the regular system. Supplemental lighting, such as approved flashlights or lanterns, shall be sufficient to allow all employees to evacuate the tunnel.(6) Electrical installation in underground areas where oil, grease, or diesel fuel are stored shall be used only for lighting fixtures.(7) Lighting fixtures in storage areas, or within 25 feet (7.62 meters) of underground areas where oil, grease, or diesel fuel are stored, shall be approved for class I, division 2 locations, as prescribed in Construction Safety Standard Part 17 "Electrical Installations," as referenced in R 408.41410.Mich. Admin. Code R. 408.41466
1993 AACS; 2003 AACS; 2013 AACS; 2014 AACS