How often should bonding be provided between supply conductors and communication shields?

The requirement for bonding between supply conductors and communication shields at intervals not to exceed 1000 feet reflects the need for maintaining safety and preventing electromagnetic interference within electrical systems. Proper bonding helps ensure that any fault currents are safely managed, reducing the risk of equipment damage, fire hazards, or electrical shock.

In this context, following the 1000-foot interval guideline ensures that the connections remain effective across the distance of the installation. This approach provides a consistent and reliable method for managing potential differences in ground potential, which can lead to performance issues in communication systems and safety risks if not properly bonded.

Other options suggest shorter intervals or bonding only at specific points, which may not sufficiently address the potential for interference or safety concerns over longer distances. The selected answer aligns with industry standards and best practices for installations, ensuring that systems remain safely and effectively bonded over the entire length of the conductors involved.