Final answer:
The claim that high-voltage wires are insulated is false; they are bare and supported by insulating connectors that prevent electrical current from reaching the metal towers.
Step-by-step explanation:
The statement that the high-voltage wires connected to metal-frame towers are held aloft by insulating connectors and are wrapped in an insulating material is false. High-voltage power lines are typically made of aluminum or copper without any insulation around them because the air acts as an insulator, and they are too high up to pose a direct risk to people.
The wires are supported by insulators that prevent the current from reaching the towers, which are normally grounded. These insulators are made of materials like ceramic or glass, and they are crucial for maintaining the safety and functionality of the power transmission system.