What is the principal cause of ignition of explosive mixtures?

The principal cause of ignition of explosive mixtures is often attributed to electric arcs. Electric arcs can occur when there is a sudden discharge of electricity across a gap between conductive materials, producing a high-temperature spark. This spark has the potential to ignite explosive gases or dust present in the environment, making it a significant hazard in industrial settings where explosive mixtures may be present.

While heat from machinery, static electricity, and friction can also lead to ignition, electric arcs are particularly dangerous because they can occur unexpectedly and produce sufficient energy to ignite volatile substances. The nature of electric arcs means they can bypass insulation and other safety measures, leading to a higher risk of ignition compared to other sources. Understanding the role of electric arcs helps emphasize the importance of electrical safety and proper equipment maintenance in preventing explosions in environments with explosive atmospheres.