The principle behind the chain is the same as that which governs the grounding of any electrical installation. Its operation can be summarized in two steps:
Load handling: being made of a highly conductive material, the chain captures the static electricity accumulated in the chassis and structure of the truck.
Discharge to the ground: As it crawls across the pavement, the chain continuously transfers those loads to the ground, dissipating them before they can reach dangerous levels.
We could describe it as an “inverted lightning rod”: instead of channeling a discharge from the sky, it guides the electricity generated inside
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