What is the minimum distance a substation metal fence must be bonded to the grounding electrode system from exposed conductors?

The minimum distance a substation metal fence must be bonded to the grounding electrode system is specified to ensure safety and prevent electrical hazards. Bonding the fence to the grounding system creates a path for fault currents, which helps to minimize the risk of electric shock in the event of a fault condition involving exposed conductors.

The correct answer reflects the requirement of 16 feet from exposed conductors. This distance is established to reduce the chance of an electrical potential difference developing between the fence and the grounding system. By bonding the fence at this specified distance, it ensures that anyone who might come into contact with the fence is less likely to experience dangerous voltages.

In many electrical safety standards, maintaining a safe distance is critical to provide a barrier between high-voltage areas and equipment or structures, thus protecting both individuals and infrastructure. The choice of 16 feet aligns with national electrical codes and safety practices that seek to mitigate electrical hazards associated with substations.