Passive or Active Grounding that is the Question?
For years now simple passive grounding has been used throughout industry as a low-cost safety measure and protection against fires and explosions caused by static electricity but is it as safe as you think?
Passive grounding clamps and cables are only suitable if the metallic object to be grounded has a bright clean surface. This allows even a poorly designed passive grounding clamp to make a low resistance connection to the metal object.
However, not every industrial environment can use a bright clean metal surface, as mild steel usually needs painting to prevent rust and corrosion. This is clearly a physical barrier between the metal surface and the passive grounding clamp.
Paint is the number one enemy of successful and reliable passive grounding. The other main enemy is the product itself causing a barrier between the metal and the clamp with passive grounding, even bright clean stainless steel can be affected by product coatings.
Download Full Article (Approximate reading time 5 mins)