In a multi-grounded neutral system of more than 1,000 volts, how often must the connections to ground from the neutral conductor be made?

The correct choice reflects the standards applicable to multi-grounded neutral systems, particularly those with voltages exceeding 1,000 volts. In such systems, the connections from the neutral conductor to the ground must be made at specific intervals to ensure safety and reliability. This is because grounding is crucial for the protection of equipment and personnel, providing paths for fault currents and stabilizing voltage levels.

The requirement for grounding connections at intervals not exceeding 1,300 feet ensures that any potential faults can be effectively managed. By specifying this distance, regulatory standards seek to limit the number of ground connections to prevent excessive resistance and maintain the conductive path's effectiveness.

The other options, although they suggest intervals that are less than the requirement of 1,300 feet, do not align with the established safety guidelines intended for neutral grounding in high-voltage systems. This emphasizes the importance of ensuring appropriate grounding practices to maintain system integrity and safety.