Certified Fire Protection Specialist (CFPS) Practice

The correct choice is mechanical sparks, which have historically been a significant ignition source for dust explosions in various industrial settings, including Germany. Mechanical sparks can be generated by equipment such as grinding machines, mixers, or other machinery used in the processing of combustible dusts. When particles of dust are disturbed or come into contact with metal surfaces, they can create sparks that ignite the combustible dust cloud, leading to explosive conditions.

Understanding the nature of ignition sources is crucial in industrial environments where combustible dust is present. While electrical sparks, static electricity, and even cigarettes can pose risks, mechanical sparks have frequently been identified as a more prevalent and critical source of ignition in many cases, particularly where heavy machinery is involved in operations that generate or disturb dust.

Recognizing the prevalence of mechanical sparks allows for more effective risk assessments and the implementation of targeted safety measures, such as improved dust collection systems, regular maintenance of machinery, and the incorporation of explosion-proof equipment to mitigate these hazards.