Emulsion means an explosive material containing substantial amounts of oxidizers dissolved in water droplets, surrounded by an immiscible fuel. 57.11041 Landings for inclined ladderways. A passage, walk, or haulageway regularly used or designated for persons to go from one place to another. Electrical conductors exposed to mechanical damage shall be protected. (b) A fire suppression system may be used as an alternative to fire extinguishers if the system can be manually activated. When equipment must be moved or operated near energized high-voltage powerlines (other than trolley lines) and the clearance is less than 10 feet, the lines shall be deenergized or other precautionary measures shall be taken. The IME is located at 1120 19th Street NW., Suite 310, Washington, DC 200363605; 2024299280; https://www.ime.org. Areas containing major electrical installations shall be entered only by authorized persons. Manual material handling (MMH) is the process of routinely moving and handling objects by carrying, holding, lifting, pulling, pushing, and stooping. (b) Whenever a change is made in escape and evacuation plans and procedures for any area of the mine, all persons affected shall be instructed in the new plans or procedures. Control door that serves as a barrier to the effects of fire and air leakage. 57.12048 Communication conductors on power poles. (b) The train operator, when present, is notified and the notice acknowledged. Hoists: . (2) The mine operator must certify on the application that the operator has posted one copy of the application at the mine site for at least 30 days prior to the date of application, and has provided another copy to the authorized representative of miners. Distribution box means a portable apparatus with an enclosure through which an electric circuit is carried to one or more cables from a single incoming feed line; each cable circuit being connected through individual overcurrent protective devices. Blasting circuits shall be protected from any contact between firing lines and overhead powerlines which could result from the force of a blast. (a) Compressed-air receivers and other unfired pressure vessels shall be inspected by inspectors holding a valid National Board Commission and in accordance with the applicable chapters of the National Board Inspection Code, a Manual for Boiler and Pressure Vessel Inspectors, 1979. (b) If the monitoring system indicates that methane in the mine is less than 1.0 percent, persons may enter the mine, and all places blasted shall be tested for methane by a competent person before work is started. 57.6101 Areas around explosive material storage facilities. Service of the Administrator's determination is complete upon mailing by registered or certified mail, return receipt requested. A switch that provides shunt protection in blasting circuits between the blast site and the switch used to connect a power source to the blasting circuit. If a device stops working properly during such operations, the operator must safely stop operations. Laminated partition means a partition composed of the following material and minimum nominal dimensions: 12-inch-thick plywood, 12-inch-thick gypsum wallboard, 18-inch-thick low carbon steel, and 14-inch-thick plywood, bonded together in that order (IME22 Box). (b) Routing air to exhaust system. All headframes shall be constructed with suitable design considerations to allow for all dead loads, live loads, and wind loads. This standard does not apply to diesel-powered equipment. Travelways steeper than 35 degrees from the horizontal shall be provided with ladders or stairways. (c) Coated with fire-retardant paint or other material to reduce its flame spread rating to 25 or less and maintained in that condition. A blasting galvanometer or other instrument designed for testing blasting circuits shall be used to test the following: (1) Continuity of each electric detonator in the blasthole prior to stemming and connection to the blasting line; (2) Resistance of individual series or the resistance of multiple balanced series to be connected in parallel prior to their connection to the blasting line; (3) Continuity of blasting lines prior to the connection of electric or electronic detonator series; and. (a) The mixing of ingredients to produce explosive material shall not be conducted underground unless prior approval of the MSHA district manager is obtained. Secondary blasting shall not be done when 0.5 percent or more methane is present. Copies of these publications may be examined at any Metal and Nonmetal Mine Safety and Health District Office; at MSHA's Office of Standards, Regulations, and Variances, 201 12th Street South, Arlington, VA 222025452; 2026939440; or at the National Archives and Records Administration (NARA). (2) Brakemen and trainmen are prohibited from riding between cars of moving trains but may ride on the leading end of trains or other locations when necessary to perform their duties; (f) To and from work areas in overcrowded mobile equipment; (g) In mobile equipment with materials or equipment unless the items are secured or are small and can be carried safely by hand without creating a hazard to persons; or. When such energized cables are moved manually, insulated hooks, tongs, ropes, or slings shall be used unless suitable protection for persons is provided by other means. Every person underground shall carry a positive means of being identified. However, this standard does not apply where physical limitations would prevent the safe installation or use of such trolley and trolley feeder wire. Upon abandonment of a mine, the owner or operator shall effectively close or fence off all surface openings down which persons could fall or through which persons could enter. 57.22310 Electrical cables (I-C mines). In such cases, the inspector will rely upon other available evidence to determine whether the service brake system meets the performance requirements of this standard. Surplus trailing cables to shovels, cranes and similar equipment shall be, (b) Stored on reels mounted on the equipment; or. Identity of PLHCP and most recent written determination of miner's ability to wear a respirator. [61 FR 36801, July 12, 1996, as amended at 67 FR 38385, June 4, 2002; 80 FR 52988, Sept. 2, 2015], (a) Main facilities used to store explosive material underground shall be located. A method of refuge shall be provided while a second opening to the surface is being developed. 1926.753 (c) (1) (iv) The operator shall be responsible for those operations under the operator's direct control. The hoist operator's independent ventilation system shall be provided by one of the following methods: (a) A suitable enclosure equipped with a positive pressure ventilation system which may be operated continuously or be capable of immediate activation from within the enclosure during an emergency evacuation. 57.22606 Explosive materials and blasting units (III mines). When ground support is necessary, the support system shall be designed, installed, and maintained to control the ground in places where persons work or travel in performing their assigned tasks. (4) Category IV applies to mines in which noncombustible ore is extracted and which liberate a concentration of methane that is not explosive nor capable of forming explosive mixtures with air based on the history of the mine or the geological area in which the mine is located. 57.16014 Operator-carrying overhead cranes. Bins, hoppers, silos, tanks, and surge piles. (6) Unlighted or lighted only with devices that do not create a fire or explosion hazard and which are specifically designed for use in magazines. Headframes shall be high enough to provide clearance for overtravel and safe stopping of the conveyance. The wood construction shall be covered on all sides and edges with no less than 24-gauge sheet steel. A flexible cord containing a center core of high explosives which may be used to initiate other explosives. (f) A statement of the availability of emergency communication and transportation facilities, emergency power and ventilation and location of rescue personnel and equipment. Fire extinguishers shall be recharged or replaced with a fully charged extinguisher promptly after any discharge. 57.4604 Preparation of pipelines or containers. (b) Underground belt conveyors shall be equipped with a detection system capable of automatically stopping the drive pulley if slippage could cause ignition of the belt. This back-up system shall provide and maintain a respirable atmosphere in the enclosure for a period of time equal to at least twice the time necessary to complete the evacuation of all persons designated to use that hoist as prescribed in the mine escape and evacuation plan required under standard 57.11053; or. (3) All information upon which the Administrator's determination was based. (a) Switches used to connect the power source to a blasting circuit shall be locked in the open position except when closed to fire the blast.
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