Section R. 408.15725 - Electrical installationsRule 5725.
(1) Except as required in this rule, electrical installations and equipment shall be as prescribed in the national electrical code, NFPA 70-1981, which is adopted herein by reference and may be inspected at the Department of Licensing and Regulatory Affairs, MIOSHA Standards Section, 7150 Harris Drive, P.O. Box 30643, Lansing, Michigan, 48909-8143. This code may be purchased at the cost of $27.00 from the National Fire Protection Association, Batterymarch Park, P.O. Box 9101, Quincy, Massachusetts 02269-9101, or via the internet at web-site: www.nfpa.org.(2) Electrical equipment such as lighting, power tools, and other electrical motors used in hazardous locations shall be designed for such locations and where practicable, listed by a nationally recognized testing laboratory. All wiring components and electrical equipment shall be maintained in accordance with the original design. Because of exposure to vibration and frequent rig moves, maximum use shall be made of flexible electrical cord intended for hard usage and with inherent resistance to dampness and petroleum products.(3) On a land location, an engine-driven light plant or generator shall not be located closer to the wellbore than the nearest engine operating the rig.(4) A light plant generator shall have a overload safety device to provide protection from arcing in a hazardous area or from a burnout of the generator.(5) Rig lighting equipment, except that used in a cellar, shall be classified as class 1, division 2.(6) Cellar lighting equipment shall be classified class 1, division 1.(7) The following area classifications shall determine the type of maintenance requirements for electrical equipment on the rig under normal operating conditions. When special service operations are being performed, the requirements for electrical installations under the conditions of service listed in subdivisions (a) to (h) of this subrule shall be followed: (a) When the derrick or mast is not enclosed or is equipped with a windbreak (open top and V-door) and the substructure is open to ventilation, the areas shall be classified as shown in figure 1 and shall provide not less than 12 complete air changes per hour.(b) If the rig floor and substructure are enclosed and as such, provide not less than 12 complete air changes per hour, the areas shall be classified as shown in figure 2.(c) Where appropriate, the area surrounding a drilling fluid tank located outdoors shall be provided with ventilation of not less than 12 complete air changes per hour and shall be classified as shown in figure 3.(d) If the drilling fluid tank is enclosed or located so as to provide not less than 12 complete air changes per hour, the areas shall be classified as shown in figure 4.(e) The areas surrounding a shale shaker with ventilation of not less than 12 complete air changes per hour shall be classified as shown in figure 5.(f) When the shale shaker is enclosed, the area within the enclosure shall be classified as class 1, division 1.(g) If an open fluid ditch or trench is used to connect between drilling fluid tanks, or between the drilling fluid tank and shale shaker, or open drilling fluid pits, and if ventilation of not less than 12 complete air changes per hour is provided the areas shall be classified as shown in figure 3 for tanks.(h) The area surrounding the drilling fluid pump shall not be considered hazardous unless it is so classified due to the proximity of another hazardous component or facility.(8) Motors and other electrical equipment shall be classified as prescribed in figures 1 to 5 of this rule.(9) Direct current (DC) rotary, draw works, cathead, and pump motors in a classified area shall have an enclosed cooling system or shall be purged with air from a safe source. Air units supplying purged air shall be located at the input end of the system to provide positive pressure on the ducting and motors.(10) All electrical extension cords shall be properly insulated with both male and female plugs, and the cord shall be in good condition.(11) Lamps and reflectors shall be kept clean to provide illumination.Mich. Admin. Code R. 408.15725
1979 AC; 1989 AACS; 2013 AACSAn obvious error in R 408.15725 was corrected at the request of the promulgating agency, pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule containing the error was published in Annual Administrative Code Supplement, 2013 MR 10. The memorandum requesting the correction was published in Michigan Register, 2014 MR 4