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

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MSHA PROGRAM POLICY MANUAL VOLUME V Subpart S Trolley Wires and Trolley Feeder Wires 77.1800 Cutout Switches It is the intent of this Section to require that cutout switches be installed in both trolley wires and parallel trolley feeder wires at the same point. Where it is necessary to use a cutout switch in each circuit, they shall be installed reasonably close to facilitate the opening of both circuits. The practice of using a jumper to bridge a removed section of trolley wire as a means of disconnecting power shall not be accepted. 77.1802 Insulation of Trolley Wires, Trolley Feeder Wires; and Bare Signal Wires; Guarding of Trolley Wires and Trolley Feeder Wires It is the intent of this Section that guarding shall be done with wood, plastic or other substantial nonconductive material, and be firmly secured. The mine inspector shall require additional guarding of trolley wires at all locations where a potential shock hazard exists. February 2003 (Release V-33) 211
MSHA PROGRAM POLICY MANUAL VOLUME V Subpart T Slope and Shaft Sinking In addition to the requirements of Subpart T, all applicable requirements of Part 77 shall apply to slope and shaft sinking operations unless specifically excepted by Subpart T. 77.1900 Slopes and Shafts; Approval of Plans When inspecting shaft and slope sinking operations, Part 77 will apply for inspection purposes until such time as mining is started in the coalbed to be mined. At that time, all of the applicable provisions of Part 75 shall be met by the responsible organization that commences the mining cycle in the coalbed that is to be mined. Excavation of a newly commenced slope or shaft progresses from the surface, through the overlying strata, to the coalbed to be mined. When an existing slope or shaft is extended that is open to the surface, excavation progresses from the existing slope or shaft bottom on down through underlying strata to the next coalbed to be mined. Part 77 standards will apply in these instances. When excavation of a new slope or shaft reaches the coalbed to be mined, additional excavation or construction is often required before the mining cycle can commence. Frequently, horizontal excavations in the coalbed and surrounding strata must be advanced from the shaft or slope bottom to a point that permits installation or setup of mining equipment needed for the mining cycle to begin. Similarly, a skip loading pocket, a sump area, or similar vertical excavation may need to be developed above or below the coalbed before the mining cycle can begin. In order for Part 77 standards to apply, the plans for the development and construction at the coalbed level or above or below the coalbed from the slope or shaft bottom must be submitted and addressed under the approved slope or shaft construction plan. Sufficient excavation and construction work will be permitted under the approved slope or shaft construction plan to allow installation and set up of the mining and ventilation equipment necessary to begin the mining cycle. In some cases, this excavation and construction work may include driving a connection between slopes and/or shafts. The extent of slope or shaft excavation and development work permitted under the Part 77 slope or shaft construction plan is to be kept to a minimum consistent with this policy, detailed in the approved plan, appropriate for the conditions at the mine and approved by the District Manager. After completing the work as detailed in the approved plan, application of §77.1900 will cease, and application of Part 75 standards will commence. Part 77 standards will continue to apply to all activities on the surface. In cases where a new slope or shaft is constructed from the surface into an existing mine or is raised from an existing mine January 2009 (Release V-41) 212
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Program Policy Manual - VOLUME V - Mine Safety and Health ...

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