At what heights is grounding not required if the equipment is not subject to contact by persons?

Grounding is not required for equipment when it is at a height that minimizes the likelihood of contact by persons. In the case of option B, which specifies heights of 8 feet and 5 feet, this aligns with common safety regulations that dictate where grounding can be relaxed. Generally, equipment mounted above a certain height, such as 8 feet, is less accessible and therefore less likely to pose a shock hazard if not grounded, assuming it is not otherwise accessible or within reach of individuals.

Furthermore, the lower height of 5 feet is significant because it considers situations where equipment might be positioned in a way that could still expose it to accidental contact if it's close enough to ground level, or reachable by people. Therefore, grounding may not be mandated at these heights if there is adequate protection against accidental contact with the equipment.

Understanding the significance of these distances helps clarify the reasoning behind grounding requirements, emphasizing safety based on accessibility rather than mere regulatory compliance.