What is the minimum depth at which a ground ring consisting of No. 2 bare copper must be buried?

The correct minimum depth for burying a ground ring consisting of No. 2 bare copper is 2.5 feet. This requirement is established to ensure effective grounding and bonding practices, which are crucial for both safety and performance in electrical systems. Burying the ground ring at this depth helps maintain a good connection to the earth, which is essential for dissipating electrical faults and preventing electrical shock hazards.

Grounding conductors are typically required to be buried at sufficient depths to avoid physical damage and to ensure that they maintain proper electrical contact with the ground. The thickness of the conductor, in this case, No. 2 bare copper, is also a factor; larger conductors generally require a deeper burial to reach appropriate earth resistance levels and to comply with safety regulations. This depth also considers potential disturbance from surface activities, preventing any interference that could compromise the effectiveness of the grounding system.

Thus, the depth of 2.5 feet is specified as a standard to enhance safety and reliability in electrical installations.