Under normal circumstances, static electricity may seem harmless. However, in the presence of flammable vapors, even a tiny spark can trigger ignition. Gasoline vapors are particularly volatile, and it takes very little energy to ignite them.
The Chain’s Purpose: Grounding the Vehicle
The hanging chain acts as a grounding mechanism. By maintaining contact with the road surface, it allows static electricity to safely discharge into the ground rather than accumulating on the truck’s body.
This process is known as “earthing” or “grounding.” The principle is simple: electricity naturally seeks the path of least resistance. When the metal chain touches the ground, it provides a direct pathway for excess electrical charge to dissipate harmlessly.
Without proper grounding, a spark could occur when:
The truck stops at a fuel station or depot.