Which equipment types require automatic methane detectors under the regulation?

• A. Mobile bolters
• B. Explosion-protected electrically powered loaders
• C. Explosion-protected LHD vehicles powered by a battery or internal combustion engine
• D. All of the above

Answer: (D)

Automatic methane detectors are required on equipment that operates in zones where methane may accumulate, so there is an automatic warning and protective action if gas levels rise. In underground coal mining, each of these machines can enter methane-bearing areas and has the potential to become an ignition source. Mobile bolters work along the face where gas pockets can exist. Explosion-protected electrically powered loaders and explosion-protected LHDs, whether battery-powered or using internal combustion engines, also operate in confined, gas-prone environments. The regulation extends AMDs to all of these types to ensure a rapid, automatic response—like alarms or shutdowns or ventilation changes—whenever methane is detected. Therefore, all of the above are covered by the requirement.