What is the minimum safe working distance for an unqualified worker in a 500kV yard?

The minimum safe working distance for an unqualified worker in a 500kV yard is specifically set to ensure safety from high-voltage risks. The correct answer reflects regulations that have been established based on industry standards and practices designed to protect workers from electric shock and arc flash hazards.

At 500kV, the potential for high-voltage electrical hazards necessitates a significant distance to mitigate the risk of accidental contact with energized parts or objects that may become energized through various means, such as induction or static charge. The distance of 11'11" aligns with the guidelines provided by organizations like the National Electrical Safety Code (NESC) and the Occupational Safety and Health Administration (OSHA).

Choosing a shorter distance would not adequately protect unqualified workers, as the electric field strength in a 500kV yard can pose serious threats even from a distance closer than specified. Adherence to this minimum safe working distance is crucial for ensuring the safety of personnel who may be in the vicinity of high-voltage equipment without the necessary qualifications or training to handle it safely.