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Except as provided by standard 57.5005, persons shall not be exposed to air containing concentrations of radon daughters exceeding 1.0 WL in active workings. Such locks or preventive devices shall be removed only by the persons who installed them or by authorized personnel. Blasting circuits shall be protected from any contact between firing lines and overhead powerlines which could result from the force of a blast. Escapeway means a passageway by which persons may leave a mine. (c) Tests for methane shall be conducted immediately before nonapproved equipment is taken to a face or bench after blasting. Explosive materials and blasting units (III mines). The mine operator may request that the required exhaust mine air sampling be done by the Mine Safety and Health Administration. (a) If electric blasting includes the use of branch circuits, each branch shall be equipped with a safety switch or equivalent method to isolate the circuits to be used. (c) If the monitoring system indicates that methane in the mine is 0.5 percent or more, the mine shall be ventilated and persons shall not enter the mine until the monitoring system indicates that methane in the mine is less than 0.5 percent. (b) The mine operator must provide affected miners and their representatives with an opportunity to observe exposure monitoring required by this section. If the second fixture also turns, corrective action shall be taken. The records shall be kept at the mine or nearest mine office from the date the defects are recorded, until the defects are corrected. Prior to secondary blasting, tests for methane shall be made in the mine atmosphere at blast sites by a competent person. (a) Surface belt conveyors within confined areas where evacuation would be restricted in the event of a fire resulting from belt-slippage shall be equipped with a detection system capable of automatically stopping the drive pulley. 57.22202 Main fans (I-A, I-B, I-C, II-A, III, V-A, and V-B mines). (1) Offset so that the fan and its associated components are not in direct line with possible explosive forces; (2) Equipped with explosion-doors, a weak-wall, or other equivalent devices located to relieve the pressure that would be created by an explosion underground. 57.22232 Actions at 0.5 percent methane (I-B, II-A, II-B, IV, V-B, and VI mines). Loading means placing explosive material either in a blasthole or against the material to be blasted. Respirable atmosphere for hoist operators underground. (2) Conditions noted by the person conducting the examination that may present an imminent danger shall be brought to the immediate attention of the operator who shall withdraw all persons from the area affected (except persons referred to in section 104(c) of the Federal Mine Safety and Health Act of 1977) until the danger is abated. The written examination is 30 questions pertaining to State laws/regulations and arc flash. This standard does not apply to devices designed to ignite safety fuse or to heating devices which do not create a fire or explosion hazard. 57.14130 Roll-over protective structures (ROPS) and seat belts for surface equipment. (ii) Increases in wages of the transferred miner must be based upon the new work classification. Microsoft Edge, Google Chrome, Mozilla Firefox, or Safari. (2) Drainage to a remote impoundment area that does not endanger persons. 57.5037 Radon daughter exposure monitoring. Where rope guides are used in shafts other than in shaft sinking operations, the rope guides shall be a type of lock coil construction. Also, copies of the plan and revisions thereof shall be posted at locations convenient to all persons on the surface and underground. (b) A minimum of three full turns of wire rope shall be on the drum when the rope is extended to its maximum working length. NFPA No. Protective clothing or equipment and face shields or goggles shall be worn when welding, cutting, or working with molten metal. Crosscuts before abandonment (III mines). Persons shall not perform maintenance work between machinery or equipment and ribs unless the area has been tested and, when necessary, secured. (a) Flammable liquids shall not be stored underground, except, (1) Small quantities stored in tightly closed cabinets away from any heat source. The notice shall also include the millisecond-delay interval between successive shots and between the first and last shot in a round. (2) Make this certification available to an authorized representative of the Secretary and to the representative of miners. (a) Welding operations shall be shielded when performed at locations where arc flash could be hazardous to persons. If a drill helper assists the drill operator during movement of a drill to a new location, the helper shall be in sight of, or in communication with, the operator at all times. (a) Any diesel engine introduced into an underground area of a mine covered by this part after July 5, 2001, other than an engine in an ambulance or fire fighting equipment which is utilized in accordance with mine fire fighting and evacuation plans, must either: (1) Have affixed a plate evidencing approval of the engine pursuant to subpart E of Part 7 of this title or pursuant to Part 36 of this title; or. (a) All blasting shall be initiated from the surface after all persons are out of the mine and any connecting mines. Misfire means the complete or partial failure of a blasting charge to explode as planned. 552(a) and 1 CFR part 51. Small quantities of flammable liquids drawn from storage shall be kept in safety cans labeled to indicate the contents. (h) At least two persons shall be present when lighting safety fuse, and no one shall light more than 15 individual fuses. (b) If concentrations of radon daughters less than 0.1 WL are found in an exhaust mine air sample, thereafter: (1) Where uranium is minedat least one sample shall be taken in the exhaust mine air monthly. (1) When the operator has an obstructed view to the rear, self-propelled mobile equipment shall have. (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. (1) Definitions. Components of the system shall be approved by MSHA under the applicable requirements of 30 CFR parts 18, 22, 23, and 27; or be determined by MSHA under 30 CFR part 18 to be intrinsically safe or explosion-proof. As a (b) Lead wires shall not be connected to the blasting switch until the shot is ready to be fired. Class IIIA liquidsthose having flash points at or above 140 F (60 C) and below 200 F (93.4 C). Appendix I to Subpart C of Part 57National Consensus Standards, Subpart DAir Quality, Radiation, Physical Agents, and Diesel Particulate Matter. (a) When the entire length of a conveyor is visible from the starting switch, the conveyor operator shall visually check to make certain that all persons are in the clear before starting the conveyor. (a) Prior to chute-pulling, persons who could be affected by the draw or otherwise exposed to danger shall be warned and given time to clear the hazardous area. developer resources. Roll-over protective structures (ROPS) and seat belts shall be installed on. The performance of the service brakes shall be considered acceptable if the equipment does not exceed the maximum stopping distance on at least three of the additional tests.

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