Which approach is recommended to control ignition sources during hot-work in methane-prone environments?

• A. Proceed with standard electrical equipment but monitor gas levels.
• B. Eliminate or control ignition sources, use spark-free tools and electrical equipment rated for hazardous areas, and enforce hot-work controls.
• C. Rely solely on personal protective equipment to mitigate ignition risk.
• D. Delay all work until the mine is completely methane-free.

Answer: (B)

In methane-prone mine areas, the main approach to hot-work safety is to remove or tightly control anything that could ignite a gas-air mixture, and to use equipment that cannot ignite sparks or heat the environment. This means using spark-free tools and electrical equipment that is specifically rated for hazardous locations, along with a formal hot-work control process (permits, isolation of the work area, gas testing, fire watch, and stop-work criteria). This combination directly targets the ignition sources and ensures the work is carried out only under safe conditions, rather than relying on PPE alone or on monitoring gas levels without reducing ignition risk. Waiting for methane to disappear is not practical, and relying solely on PPE or standard equipment that could spark or arc in a volatile atmosphere does not provide adequate protection.