⁠GI wire/ Stay Wire/ Earth Wire

Overhead ground wires are installed above the phase conductors of power transmission lines. Their primary function is to protect the line from lightning strikes. These wires provide a low-resistance path for lightning current to flow directly to the ground, minimizing the risk of damage to the transmission line and its equipment.

Span wires are used to control the sag of overhead conductors between towers. Adjusting the tension in the span wires, engineers can ensure that the conductors maintain a safe distance from the ground and other obstacles. This helps to prevent power outages and safety hazards.