Manufacturing Skill Standards Council (MSSC) Safety Assessment Practice Test

In environments where dust or other combustible materials are present, it is crucial to minimize the risk of fire or explosions. Removing all sources of ignition is the safest approach because it directly addresses the potential hazards that could ignite combustible dust. Ignition sources can include open flames, sparks from equipment, or even hot surfaces. By eliminating these risks, you can significantly reduce the likelihood of a fire, ensuring a safer work environment.

The context of the other options emphasizes the importance of safety protocols in combustible environments. Using kerosene heaters, for instance, introduces a potential ignition source, which is counterproductive in a setting where combustible dust is present. Similarly, allowing smoking or the use of flames would equally escalate the risk of ignition, contributing to a hazardous situation. Therefore, the action of removing all sources of ignition stands as the best practice for maintaining safety in areas with combustible materials.