Final answer:
The statement is false; high-voltage wires on metal-frame towers use insulating connectors but are not wrapped in insulating material, utilizing air as the insulator instead.
Step-by-step explanation:
The statement is false. High-voltage wires, like those connected to tall metal-frame towers, indeed use insulating connectors to keep them attached to the towers. However, these wires are not wrapped in insulating material. The air around the wires serves as natural insulation, and since the high-voltage wires are high above the ground, there is less need for additional insulating materials compared to wires found in residential or commercial buildings where they could be within reach. The design of power transmission lines ensures both the safety of the public and the efficient transmission of electricity over long distances.