In hazardous (classified) locations, are specific methods of bonding for metal raceways required even when there is an EGC or bonding jumper installed?

In hazardous (classified) locations, the presence of specific methods of bonding for metal raceways is indeed required, regardless of whether an equipment grounding conductor (EGC) or bonding jumper is installed. This requirement is grounded in the need to ensure safety in environments where flammable gases, vapors, or combustible dust may be present.

The rationale behind this requirement stems from the critical nature of preventing static electricity buildup and ensuring that any faults or stray currents are effectively managed to minimize the risk of explosions or fires. Even with an EGC or bonding jumper in place, relying solely on these methods may not provide adequate protection against potential hazards, particularly in environments with volatile materials.

The codes and standards governing electrical installations in hazardous locations mandate that metal raceways be bonded in a specific manner to ensure maximum safety and compliance. This includes using methods that provide continuous metallic paths for grounding and equipment bonding to mitigate risks associated with electrical faults. Therefore, it is essential that bonding methods are not considered optional but rather a strict requirement to maintain safety standards in such environments.