Program Policy Manual - VOLUME V - Mine Safety and Health ...

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MSHA PROGRAM POLICY MANUAL VOLUME V separately for hazards related to that particular job or work area. If the machine's operation poses a hazard to the employee performing the work, the machine shall be shut down until the work is completed or the hazard no longer exists. General maintenance and housekeeping can normally be performed while the machine is in motion except around unguarded energized electric or moving mechanical equipment. 77.405 Performing Work From a Raised Position; Safeguards Mechanical means that are manufactured as an integral part of the machine for the purpose of securing a portion of the machine in a raised position are acceptable as meeting the requirements of this section. Paragraph (b) of this Section requires that raised, elevated, and unsecured equipment must be securely blocked to prevent movement before miners position themselves under or between moveable components of the equipment. Occasionally, more than one component location on a machine must be blocked. Blocking material must be capable of supporting the weight of the equipment or component. Wood used for blocking material must be solid and should be flat sided. Most equipment can be safely blocked with a wooden crib. The crib should be installed on a solid footing and wedged tightly to the machine to prevent any initial movement that could dislodge the blocking. 77.408 Welding Operations Welding operations within enclosed areas where excessive smoke and fumes accumulate should be ventilated by mechanical means. 77.410 Mobile Equipment; Automatic Warning Devices The warning device required by this Section need not be provided for automobiles, jeeps, pickup trucks, and similar vehicles where the operator's view directly behind the vehicle is not obstructed. Service vehicles making visits to surface mines or surface work areas of underground mines are not required to be equipped with such warning devices. 77.413 Boilers It is not the intent of this regulation to cause electric hot water heaters to meet the requirements of this Section, even though the name "boiler" appears on the name plate. The regulation applies only to steam boilers. February 2003 (Release V-33) 173
MSHA PROGRAM POLICY MANUAL VOLUME V Subpart F Electric Equipment - General 77.500 Electric Power Circuits and Electric Equipment; Deenergization When electrical work is being performed on equipment, it is not necessary to completely deenergize the power system if means are provided on the equipment to deenergize the particular part or circuit on which repair work is to be done. When work is performed in close physical proximity to exposed electric circuits or parts, they shall be deenergized. Highvoltage circuits that are not equipped with metallic shielding are considered to be exposed. Sections 110-16 and 710-34 of the 1968 National Electrical Code pertaining to working clearances can be used as a guide in determining "close physical proximity." All circuits within an electrical enclosure shall be deenergized before work is performed within the enclosure unless such energized circuits are guarded by suitable physical guards or adequate physical separation. "Troubleshooting or testing", for the purpose of this Section, would include the work of locating an electrical problem in the electric circuits on an energized machine, but would not include the actual repair with the machine energized. Sections 75.1720(c) and 77.1710(c) require that protective gloves be worn by miners when they are performing work "which might cause injury to the hands," unless the gloves would create a greater hazard by becoming entangled in the moving parts of equipment. As the accident and injury data associated with working on energized circuits and equipment clearly indicates, this type of work presents a significant risk of hand injury. Therefore, gloves worn in accordance with 75.1720(c) and 77.1710(c) will be required whenever miners troubleshoot or test energized electric power circuits or electric equipment. Work gloves in good condition are acceptable for troubleshooting or testing energized low- and medium-voltage circuits or equipment. 77.501 Electric Distribution Circuits and Equipment; Repair "Electrical work," as referred to in this Section, includes the design, installation, maintenance or repair of electric equipment and circuits. Splices and terminations made in electric cables, installation of couplers on the ends of cables, electric machine repairs, electric wiring, pole and line work, work performed inside electrical substations or other areas in proximity to exposed energized electrical parts, work performed inside transformers, switchboxes, switch houses, February 2003 (Release V-33) 174
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