PROGRAM INFORMATION BULLETIN NO. P11-51
SUBJECT: De-energizing a Non-intrinsically Safe Automatic Fire Sensor and Warning Systems after a Main Mine Fan Stoppage
Scope
This Program Information Bulletin (PIB) applies to underground mine operators, miners’ representatives, mining equipment manufacturers, Mine Safety and Health Administration (MSHA) enforcement personnel and other interested parties.
http://www.msha.gov/regs/
