Final answer:
High-voltage wires are held aloft by insulating connectors but are not wrapped in insulating material, relying on air insulation instead.
Step-by-step explanation:
The statement that high-voltage wires are wrapped in an insulating material is false. High-voltage wires, like those you see connected to tall metal-frame towers, are indeed held aloft by insulating connectors to prevent electricity from grounding through the structure of the towers. However, these wires are not typically covered in additional insulating material.
High-voltage wires are generally designed to be air-insulated, with the surrounding air acting as an effective insulator. The spacing between the wires and the design of the towers are carefully calculated to ensure that the air around the wires provides sufficient insulation to prevent electrical arcs, even at high voltages.