Section 512.1549 - Main shafts and raises; operator of underground mine to prepare written plan to provide secondary power supply source1. All main shafts and raises equipped with hoisting machinery for personnel must be:(a) Equipped with one compartment that is partitioned off and set aside as a ladderway;(b) Equipped with secondary or emergency hoisting machinery in the main shaft that is supplied by a secondary power supply source which supplies power to the primary hoisting machinery;(c) Supplemented with hoisting machinery in an additional shaft that is supplied by a secondary power supply source which does not supply power to the main shaft and is connected by not fewer than two underground passageways to the main shaft or ventilation shaft; or(d) Connected by a drift or decline to the surface that does not require hoisting machinery for movement.2. An operator of an underground mine shall prepare a written plan to provide a secondary power supply source to a primary hoisting machine within not more than 8 hours after the failure of a primary power supply source. The operator shall submit the plan to the Enforcement Section for approval. Any proposed modification to the plan must be submitted to and approved by the Enforcement Section before the modification becomes effective.3. As used in this section, "secondary power supply source" means a source of power which is separate from the primary power supply source and which is constructed and installed or designed for emergency installation and use in the event of failure of the primary power supply source.Nev. Admin. Code § 512.1549
Added to NAC by Div. of Industrial Relations by R125-08, eff. 5-30-2012