Final answer:
The statement about high-voltage wires being wrapped in insulating material is false. While they are held aloft by insulating connectors, the wires themselves are not insulated but are bare, using air as the natural insulator.
Step-by-step explanation:
The statement that high-voltage wires are wrapped in an insulating material is false. The high-voltage wires, also known as transmission lines, that are connected to tall metal-frame towers are indeed held aloft by insulating connectors; however, they are not wrapped in an insulating material.
Transmission lines carry electricity at high voltages over long distances, and they are designed to be bare to minimize the materials and costs involved. The air around the wires serves as a natural insulator, and the insulating connectors prevent electricity from travelling to the ground through the towers.
The safety and efficacy of these systems are based on precise engineering and adherence to strict standards.