§§ 75.900-3 and 77.900-1, circuit breakers, including those that have been repaired or rebuilt, must be examined and tested monthly and properly maintained by a qualified person to assure that they are in safe operating condition. It also emphasizes that the mine operator must keep a record of such examinations. §§ 75.900-3 and 77.900-1 regarding potentially dangerous conditions involving circuit breakers, including those that have been repaired or rebuilt. This PPL provides guidance on the examination, testing and maintenance requirements of circuit breakers under 30 C.F.R. This program policy letter (PPL) is intended for Coal Mine Safety and Health Administration (MSHA) enforcement and Technical Support audit personnel, equipment manufacturers, repair facilities, coal mine operators, independent contractors, miners' representatives, and other interested parties. SUBJECT: Suitability, Safety and Performance of Circuit Breakers
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