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

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MSHA PROGRAM POLICY MANUAL VOLUME V mining machines, it is, at times, impossible to install a light fixture exactly as specified in the STE. In other instances, if a light fixture is installed in the specified location, the light source is in direct view of the operator or helper and objectionable glare is created. Therefore, it has become necessary to establish procedures which will permit coal mine operators to make application to the district manager in the district in which the mine is located for approval of a modification of an STE. The term "a miner's normal field of vision," as contained in paragraph (e), means surfaces that can be readily seen by a miner from any position in the working place that his/her duties require him/her to be while self-propelled mining equipment is being operated. Not included are floor surfaces under the machine or surfaces behind line curtains or ventilation tubing. Paragraph (g) requires that light fixtures be designed and installed to minimize discomfort glare. There are some locations on board certain mining machines in thin coal seams in which it is impossible to install presently available fixtures without creating discomfort glare to miners. Extremely bright lights are required to light the area from rib to rib in thin coal seams (less than 42 inches in thickness), and these light fixtures of necessity are installed at the miner's eye level which compounds the glare problem. To combat this glare problem in seams with mining heights less than 42 inches, it is necessary to reduce the area in which light measurements are made to not more than 5 feet from the machine and to specify other locations in which light measurements are not to be taken. The intent of this policy is not to allow a reduction in the number of light fixtures used, but to permit better locations, diffusing, and guarding of light fixtures as a method of reducing or eliminating discomfort glare. This policy recognizes the technical problems involved in reducing glare and defines locations within the area specified in paragraph (e)(1) through paragraph (e)(6) in which light measurements are to be taken. When the mining height is less than 42 inches, light measurements shall be made within an area the perimeter of which is 5 feet from any part of continuous-mining machines, loading machines, coal drills, and cutting machines when measured parallel to the mine floor. Headlights on continuous-mining machines and loading machines should be oriented so that the maximum amount of light is provided on the coal face. This improves the ability of the machine operator to see February 2003 (Release V-33) 150
MSHA PROGRAM POLICY MANUAL VOLUME V the location of the cutting bits or gathering arms. Therefore, to allow the most efficient utilization of the available light, light measurements shall not be taken of the floor area between the cutter boom hinge pin or gathering head hinge pin and the coal face. Scoops used as load/haul/dump vehicles, clean-up, or supply vehicles shall be illuminated in accordance with paragraph (e)(6) while such vehicles are being operated in the working place. Auger-Type Continuous Miners Most auger-type continuous-mining machines are operated with jack setters and timbermen working inby the miner operator in close proximity to rotating cutting bits or the machine. These miners must be able to communicate with the miner operator by means of signaling with their cap lamps and even small amounts of glare can be extremely hazardous. Present technology will not permit installation of light fixtures on rope-propelled, auger-type continuous-mining machines in which miners are required to be inby the machines to set jacks or timbers without creating discomfort glare to the jack setters or timbermen. Therefore, illumination will not be required in working places in which rope-propelled, auger-type continuous-mining machines are operated if jack setters or timbermen are required to work inby the machine operator pending the development of glare-free illumination systems for these machines. Illumination is not required in a working place in which a roof bolting machine is being operated if a rope-propelled, auger-type continuous-mining machine is also being operated in the same working place. Remotely-Controlled Continuous Miner When the mining height is less than 42 inches and remotely-controlled continuous-mining machines are operated in the working place, light measurements shall not be made of the area on the right side of the machine and outby the center of the main frame. Shortwall Mining Equipment 1. When either chain conveyors or extensible belt conveyors are used to transport the coal from the continuous miner to the section loading point, the following areas shall be illuminated: a. The face; b. The area for the length of the self-advancing roof support system and all surfaces within the miner's normal field of vision between the gob-side of the February 2003 (Release V-33) 151
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