What is the maximum distance increments for placing 3-phase grounds on conductors, subconductors, or pulling lines?

The maximum distance increment of 4 miles for placing 3-phase grounds on conductors, subconductors, or pulling lines is based on established safety standards and operational practices in electrical power systems. This distance ensures that grounding is effective and minimizes the risk of electrical hazards during maintenance or fault conditions.

Grounding is vital for safety in overhead power systems, as it helps clear faults by providing a low-resistance path for fault currents. By having a maximum distance of 4 miles, utility operators can ensure that grounds are placed at adequate intervals to maintain system reliability and safety, especially in the event of a fault or outage. This distance allows crews to effectively manage potential hazards while adhering to regulatory guidelines.

Other distances like 2, 6, or 8 miles do not align with standard practices for grounding; they either provide insufficient grounding for effective fault protection or exceed practical limits for handling maintenance operations safely. Thus, the 4-mile specification strikes a balance between operational efficiency and safety.