Which of the following must be true about the grounding electrode conductor?

The grounding electrode conductor must be listed for its purpose, which ensures it meets the necessary standards and specifications for safety and reliability in electrical installations. This requirement is crucial for maintaining the integrity of the grounding system, as a listed conductor has been tested and approved by recognized testing laboratories to provide adequate protection against electrical faults.

A grounding electrode conductor that is not listed may not perform effectively under fault conditions, which could lead to unsafe scenarios such as electrical shock or fire hazards. Therefore, using a component that is specifically rated for its intended application is central to ensuring compliance with electrical codes and providing a safe electrical environment.

The other aspects concerning grounding electrode conductors, such as insulation, material type, and specific connection types, are not universally mandated. While insulation may be required in certain applications, it is not a blanket requirement for all grounding electrodes. Similarly, grounding electrode conductors can be made of various materials, not just copper, based on the requirements of the installation. Finally, grounding electrode conductors can connect to various grounding systems, not limited to just ground rods.