What does arc tracking refer to?

Arc tracking refers to the phenomenon where an electrical arc travels along a surface between conductive materials. This can occur in the presence of contaminants like salts, dust, or liquids, which can provide a conductive pathway, allowing the arc to "track" along the surface rather than traveling directly through the air. This process can lead to insulation damage, component failure, or even fires if the arc tracking goes unchecked.

Understanding this concept is crucial for fire investigations, especially in cases involving electric fires, as identifying evidence of arc tracking can help determine the cause of the fire and the conditions that allowed it to occur. Such an understanding assists investigators in assessing the safety and integrity of electrical systems.