Regarding ground ring installations, which statement is true?

• A. The bare copper conductor must be buried at least 2.5 feet below grade
• B. It must be buried at least 1 foot below grade
• C. It must be installed above grade
• D. It must be insulated along its entire length

Answer: (D)

Ground rings are used as part of the grounding electrode system to create a continuous path to earth around a structure. The key point here is that the ring conductor should be insulated along its entire length. Insulating the ring prevents it from forming unintended electrical bonds with buried metals and moisture in the soil, helps protect the conductor from corrosion, and keeps its connection to the grounding system defined and reliable. The other ideas imply specific burial depths or placing the conductor above grade or bare, which are not the installation requirement described here.