What is the minimum clearance required for voltages between 46,100 to 72,500 volts?

The minimum clearance required for electrical voltages between 46,100 to 72,500 volts is indeed 3 feet. This clearance requirement is crucial for ensuring safety in utility operations, as it helps prevent accidental contact and enhances the overall safety of both workers and the public.

This standard is established based on electrical safety guidelines that outline the necessary distances to prevent electrical hazards, including electrical shock and arc flash incidents. Such standards take into account factors like voltage levels and the physical environment around electrical installations, ultimately promoting a safe operational environment.

The other options do not align with the established safety standards for this range of voltage. Clearances that are either too short or too extreme can either increase the risk of accidents or are excessively cautious without grounding in practical risk assessments. The requirement for 3 feet strikes a balance, ensuring enough distance is maintained while not unnecessarily complicating the installation or maintenance of electrical systems.