If more than one electrode is used, each electrode of the grounding system must not be less than what distance from any other electrode of another grounding system?

The correct option is based on requirements established by grounding and bonding standards, particularly in relation to fire alarm systems and electrical safety. In grounding systems, maintaining adequate spacing between electrodes is crucial for several reasons, including minimizing electrical interference and ensuring proper fault current distribution.

When multiple electrodes are used in a grounding system, spacing them at least 6 feet apart helps to ensure that they operate effectively without impacting each other's performance. This distance is based on electrical and physical principles that prevent the interactions between nearby grounding systems that could lead to issues like unwanted current paths or harmonics, which can affect both the safety and effectiveness of the grounding system.

Adhering to this spacing requirement is critical in fire alarm systems to reduce potential hazards linked to electrical faults and to ensure compliance with relevant codes and standards that govern electrical installations. These factors underscore the importance of proper grounding practices in maintaining system integrity and safety in electrical installations, especially in critical environments like those protected by fire alarm systems.