Blasting circuits shall be protected from any contact between firing lines and overhead powerlines which could result from the force of a blast. Stationary diesel equipment underground shall be, (a) Supported on a noncombustible base; and. If methane reaches 2.0 percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from the mine until methane is reduced to less than 0.5 percent. If inconsistent with the general definitions in this section, the definition in the subpart will apply in that subpart: Abandoned areas means areas in which work has been completed, no further work is planned, and travel is not permitted. Concrete, masonry block, brick, and steel are examples of noncombustible materials. The constant speed shall be maintained up to the point when the equipment operator receives the signal to apply the brakes. (2) If air samples are delivered to remote analytical devices through sampling tubes, such tubes shall be provided with in-line flame arrestors. When parked on a grade, the wheels or tracks of mobile equipment shall be either chocked or turned into a bank or rib. Excursions above the listed thresholds shall not be of a greater magnitude than is characterized as permissible by the Conference. (a) Welding operations shall be shielded when performed at locations where arc flash could be hazardous to persons. Eye protection when operating grinding wheels. Copies are available at MSHA's Office of Standards, Regulations, and Variances, 201 12th Street South, Arlington, VA 22202-5452; 202-693-9440; and at all Metal and Nonmetal Mine Safety and Health District Offices, or available for inspection at the National . [69 FR 38840, June 29, 2004, as amended at 80 FR 52987, Sept. 2, 2015]. Telephones or other two-way communication equipment with instructions for their use shall be provided for communication from underground operations to the surface. ANSI N13.81973 may be examined at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration, and may be obtained from the American National Standards Institute, Inc., at 25 W. 43rd Street, 4th Floor, New York, NY 10036; http://www.ansi.org. For rope lengths 4,000 feet or greater: Minimum Value = Static Load 5.0. (a) The Administrator's proposed notice of placement or change in placement shall be sent to the mine operator and the appropriate representative of miners and shall include. 57.12020 Protection of persons at switchgear. (b) Defects on any equipment, machinery, and tools that affect safety shall be corrected in a timely manner to prevent the creation of a hazard to persons. Where access is necessary, suitable clearance shall be provided at stationary electrical equipment or switchgear. If any part of a blast is connected in parallel and is to be initiated from powerlines or lighting circuits, the time of current flow shall be limited to a maximum of 25 milliseconds. No person shall smoke or use an open flame where flammable or combustible liquids, including greases, or flammable gases are, (a) Used or transported in a manner that could create a fire hazard; or. The requirements of this standard apply to underground areas only. For the protection of operators of hoists located underground which are part of the mine escape and evacuation plan required under standard 57.11053, the hoist operator shall be provided with a respirable atmosphere completely independent of the mine atmosphere. In shafts inclined over 45 degrees, the operator shall determine and post in the conveyance or at each shaft station the maximum number of persons permitted to ride in a hoisting conveyance at any one time. (c) Provided with damage protection as near as possible to that of the original, including good bonding to the outer jacket. (1) Stored in a manner to facilitate use of oldest stocks first; (2) Stored according to brand and grade in such a manner as to facilitate identification; and. 57.22240 Actions at 2.0 percent methane (V-A mines). Before welding or cutting on a hollow shaft, the shaft shall be thoroughly cleaned inside and out and vented with a minimum 12-inch diameter opening to allow for sufficient ventilation. Blasting agents are substances classified as blasting agents by the Department of Transportation in 173.114(a) of Title 49 of the Code of Federal Regulations (1986 Edition). Comments or questions about document content can not be answered by OFR staff. Each ungrounded conductor or telephone wire that leads underground and is directly exposed to lightning shall be equipped with suitable lightning arrestors of approved type within 100 feet of the point where the circuit enters the mine. Where it is impractical to install such protective devices, adequate warning signals shall be installed. [52 FR 24941, July 1, 1987, as amended at 54 FR 30508, July 20, 1989]. Ground conditions that create a hazard to persons shall be taken down or supported before other work or travel is permitted in the affected area. Section 75.1400 (e) requires that when persons are transported into or out of a mine by a hoist, a qualified hoisting engineer shall be on duty while any person is underground. 57.13010 Reciprocating-type air compressors. 57.18009 Designation of person in charge. Short circuit means an abnormal connection of relatively low resistance, whether made accidentally or intentionally, between two points of difference potential in a circuit. (b) Upon initial release of gas into the mine atmosphere from boreholes. (a) Berms or guardrails shall be provided and maintained on the banks of roadways where a drop-off exists of sufficient grade or depth to cause a vehicle to overturn or endanger persons in equipment. Box 371954, Pittsburgh, PA 152507954; Telephone: 8665121800 (toll free) or 2025121800; http://bookstore.gpo.gov, or may be examined in any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration. Safety Practices and Operational Procedures. Dry wooden platforms, insulating mats, or other electrically-nonconductive material shall be kept in place at all switchboards and power-control switches where shock hazards exist. (c) A raised component must be secured to prevent accidental lowering when persons are working on or around mobile equipment and are exposed to the hazard of accidental lowering of the component. This switch shall be located within reach of the hoistman in case the manual controls of the hoist fail. Guard nets or other suitable protection shall be provided where tramways pass over roadways, walkways, or buildings. (a) When moving mobile equipment between workplaces, booms, forks, buckets, beds, and similar movable parts of the equipment shall be positioned in the travel mode and, if required for safe travel, mechanically secured. At least 50 feet from: timbered areas, exposed combustible rock, and any other combustible material, Control door that meets the requirements for a ventilation door in conformance with, Within 50 feet but no closer than 20 feet of: timbered areas, exposed combustible rock, or other combustible material. (5) Locations of air regulators and stoppings and ventilation doors not shown in paragraph (d) of this standard; (6) Locations of overcasts, undercasts and other airway crossover devices not shown in paragraph (d) of this standard; (8) Locations of known underground mine openings adjacent to the mine; (9) Locations of permanent underground shops, diesel fuel storage depots, oil fuel storage depots, hoist rooms, compressors, battery charging stations and explosive storage facilities. (1) The operator shall promptly notify miners in any affected areas of any conditions found that may adversely affect safety or health and promptly initiate appropriate action to correct such conditions. 57.20014 Prohibited areas for food and beverages. 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). (d) Defects on self-propelled mobile equipment affecting safety, which are not corrected immediately, shall be reported to, and recorded by, the mine operator. 57.7013 Covering or guarding drill holes. 57.19017 Emergency braking for electric hoists. These records shall include the individual's time in each active working area and the concentrations of airborne radon daughters for each active working area. 57.14218 Movement of equipment on adjacent tracks. Receptacles or racks shall be provided for drill steel and tools stored or carried on drills. (2) The escape route shall bypass the shop area so that the route will not be affected by a fire in the shop area. 57.19069 Entering and leaving conveyances. Company name and address, U.S. Department of Labor Mine Safety and Health Administration OMB Number 1219-0127. (b) At the completion of each inspection or test required by this standard, the person making the inspection or test shall certify that the inspection or test has been made and the date on which it was made. (c) Inspected for smoldering fires at the end of each shift. (2) Hoisting in adjacent shaft compartments, except for empty conveyances or counterweights, shall be stopped until transportation of the explosive material is completed. The records shall be made available to the Secretary or his authorized representative. (a) Wire rope shall be attached to the load by a method that develops at least 80 percent of the nominal strength of the rope. Surface electric substations and liquid storage facilities. Certifications and records shall be retained for one year. 30 CFR Part 57 - LII / Legal Information Institute After initial rope stretch but before visible wear occurs, the rope diameter of newly installed wire ropes shall be measured at least once in every third interval of active length and the measurements averaged to establish a baseline for subsequent measurements. Circuits shall be protected against excessive overloads by fuses or circuit breakers of the correct type and capacity. Surface fire suppression systems are exempt from these inspection requirements if the systems are used solely for the protection of property and no persons would be affected by a fire. Subscribe to: Changes in Title 30 :: Chapter I :: Subchapter K :: Part 57. (b) To prevent injury from wheel rims during tire inflation, one of the following shall be used: (1) A wheel cage or other restraining device that will constrain all wheel rim components during an explosive separation of a multi-piece wheel rim, or during the sudden release of contained air in a single piece rim wheel; or. 57.4604 Preparation of pipelines or containers. (c) When broken rock or material is dumped into an empty chute, the chute shall be equipped with a guard or all persons shall be isolated from the hazard of flying rock or material. (g) Wearing seat belts. (d) Mine power transformers and stationary equipment not approved by MSHA under the applicable requirements of 30 CFR parts 18 through 36 shall be installed in fresh air or downwind from an atmospheric methane monitor sensor. This record shall be retained until the rope is retired from service. The eCFR is displayed with paragraphs split and indented to follow Capped fuse means a length of safety fuse to which a blasting cap has been attached. A record of any part that is not functioning properly shall be made and dated. When explosive material is hauled by trolley locomotive, covered, electrically insulated cars shall be used. This document is available in the following developer friendly formats: Information and documentation can be found in our (2) On the surfacecovered metal containers or equivalent containers with flame containment characteristics. Bonding metal pipelines to ground return circuits. For rope lengths 3,000 feet or greater: Minimum Value = Static Load 4.0. (1) Flame safety lamps shall not be used to test for methane except as supplementary devices. 57.5039 Maximum permissible concentration. (d) Records of all instruction shall be kept at the mine site or nearest mine office at least 2 years from the date of instruction. 57.22207 Booster fans (I-A, II-A, III, and V-A mines). (a) Manually-operated horns or other audible warning devices provided on self-propelled mobile equipment as a safety device shall be maintained in a functional condition. Categories and subcategories are defined as follows: (1) Category I applies to mines that operate within a combustible ore body and either liberate methane or have the potential to liberate methane based on the history of the mine or the geological area in which the mine is located. (d) Load-engaging device downgrade when traveling unloaded on all grades. Trolley wires shall be installed at least seven feet above rails where height permits, and aligned and supported to suitably control sway and sag. 57.22226 Testing for methane (IV mines). Procedures for inspection, testing, and maintenance. 57.19076 Maximum speeds for hoisting persons in buckets. A suitable communication system shall be provided at the mine to obtain assistance in the event of an emergency. Inspection of compressed-air receivers and other unfired pressure vessels. 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. Mantrips shall be covered if there is danger of persons contacting the trolley wire. (c) The affected area shall be inspected during the first hour after the operation is completed. All seals, and those stoppings that separate main intake from main return airways, shall be of substantial construction and constructed of noncombustible materials, except that stoppings constructed of brattice materials may be used in face areas. eCFR :: 30 CFR Part 57 -- Safety and Health Standards - eCFR :: Home 57.19110 Overhead protection for shaft deepening work. 57.12011 High-potential electrical conductors. 57.22223 Crosscuts before abandonment (III mines). This publication may be examined at any Metal and Nonmetal Mine Safety and Health Subdistrict Office of the Mine Safety and Health Administration, or may be obtained from the American National Standards Institute, Inc., 25 W. 43rd Street, 4th Floor, New York, NY 10036; http://www.ansi.org. Seals and stoppings (III, V-A, and V-B mines). [A copy of Title 49 is available at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration]. (3) Measurement of airborne asbestos fiber concentration. 3, 2006]. (b) While cutting or drilling is in progress, equipment not approved by MSHA under the applicable requirements of 30 CFR parts 18 through 36 shall remain at least 100 feet from the face or bench being mined. (b) Waste or rags containing flammable or combustible liquids that could create a fire hazard shall be placed in the following containers until disposed of properly: (1) Undergroundcovered metal containers. (a) For 30 minutes if safety fuse and blasting caps are used; (b) For 15 minutes if any other type detonators are used; or. 1926.1427 - Operator training, certification, and evaluation If the second fixture also turns, corrective action shall be taken. If used as an alternative, routing the mine shop exhaust air directly to an exhaust system shall be done so that no person would be exposed to toxic gases in the event of a shop fire. 57.12037 Fuses in high-potential circuits. (3) Any group of containers used for storage of more than 60 gallons of combustible liquids. (e) Damaged or deteriorated cartridges of grouting material shall not be used. This content is from the eCFR and may include recent changes applied to the CFR. 1291 (30 U.S.C. 57.22202 Main fans (I-A, I-B, I-C, II-A, III, V-A, and V-B mines). Where restricted clearance creates a hazard to persons on mobile equipment, warning devices shall be installed in advance of the restricted area and the restricted area shall be conspicuously marked. (b) On a regular lay rope, more than one broken wire in the valley between strands in one rope lay length. Actions at 2.0 percent methane (V-A mines). (1) The location of the stored material and the storage practices used; (2) The transportation and use of the explosive material; (3) The nature of the explosive material, including its sensitivity; (4) Any other factor deemed relevant to the safety of miners potentially exposed to the hazards associated with the mixing of the bulk explosive material underground.