Under which condition can multiple conductors be connected to a grounding electrode with a single clamp or fitting?

A clamp or fitting used to connect multiple conductors to a grounding electrode must be specifically designed and listed for that purpose. When clamps are listed for multiple conductors, they are tested and approved for the load and environmental conditions they will encounter when used in grounding systems. This ensures that the connection is secure, reliable, and meets the necessary safety standards to effectively perform its grounding function.

Choosing the appropriate clamp is critical in grounding applications to ensure proper electrical continuity and to minimize the risk of electrical faults or failures. The listing for multiple conductors indicates that the clamp can safely accommodate the number of conductors specified without compromising the integrity of the connection, which is essential for the safety and reliability of the electrical system.

Other conditions regarding the material or type of clamps (like being plastic, copper, or aluminum) do not specifically address the critical requirement that the clamp must be listed for multiple conductors, which is paramount for ensuring compliance and safety in electrical installations.