Professional Answer: As a leading manufacturer, we can confirm that the materials for these components are chosen for specific properties:

1. Conductors: Typically aluminum or aluminum-steel reinforced (ACSR) for a balance of conductivity and tensile strength.

2. Line Supports: Steel for high-voltage towers, or wood and concrete for lower-voltage poles, chosen for their durability and cost-effectiveness.

3. Insulators: Porcelain, toughened glass, or composite polymers are used for their high resistance to electrical current and environmental conditions.

4. Cross-Arms: Generally made of wood, fiberglass, or galvanized steel for structural support and corrosion resistance.

5. Ground Wires: Made of copper or aluminum to provide a low-resistance path to the ground for fault currents and lightning.