Professional Answer: The construction of a reliable overhead transmission line system requires several key components, all of which we specialize in at Ningbo Changshi:

1. Conductors: These are the wires that carry the electric current. They are typically made of materials like ACSR (Aluminum Conductor Steel Reinforced) for its high strength-to-weight ratio and excellent conductivity.

2. Supporting Structures: These are the towers or poles that elevate the conductors to a safe height above the ground. The type of structure (e.g., lattice steel tower, single-pole) depends on the voltage level and the terrain.

3. Insulators: Made from materials like porcelain or glass, insulators prevent the electric current from flowing from the conductors to the supporting structures. The number and type of insulators used are determined by the voltage of the line.

4. Hardware and Accessories: This category includes a wide range of essential equipment such as cross-arms, clamps, vibration dampers, and lightning arresters, all designed to ensure the mechanical and electrical integrity of the line.