What is used to sag a conductor uniformly?

The ruling span is a critical concept used in the design and installation of overhead electrical lines. It refers to the span length between two adjacent poles or supports where the conductor's sag and tension can be assumed to be uniform. By using the ruling span, engineers can calculate how much a conductor will sag under its weight and under varying temperature conditions, ensuring that the conductor has enough clearance from the ground and other structures. This method provides a standardized way to gather data for calculating sag, which is vital for the safety and reliability of the electrical system.

Other choices, while they may refer to components involved in the installation or maintenance of conductors, do not directly relate to the method of ensuring uniform sag. The sagging agent, balancing weight, and tensioning cable may play a role in specific adjustments or applications, but the ruling span is specifically utilized for establishing a consistent understanding of how sag is measured and applied across multiple spans in a power distribution network.