What must be true of a single clamp used for grounding electrode conductors?

A single clamp used for grounding electrode conductors must be labeled for use with multiple conductors to ensure that it can effectively accommodate different configurations and sizes of conductors. This labeling indicates that the clamp has been tested and approved for use with multiple grounding conductors, which is essential for maintaining safe and effective grounding systems. Such clamps are designed to provide secure connections that allow for proper grounding continuity and ensure that the grounding system functions effectively.

Other choices may relate to different aspects of grounding practices, but the specification for using multiple conductors demonstrates a necessary feature for versatility and compliance with standards in grounding installations. This aspect is critical for ensuring that the grounding system can adapt to various setups while maintaining safety.