Final answer:
The statement regarding high-voltage power lines being wrapped in insulating material is false; they are actually exposed and the air provides the necessary insulation.
Step-by-step explanation:
The statement is false. The high-voltage wires that are connected to tall metal-frame towers are indeed held aloft by insulating connectors to prevent the current from grounding. However, these wires are not typically wrapped in insulating material. The air around the wires serves as sufficient insulation to prevent current from arcing to nearby structures or directly to the ground under normal circumstances. These power lines are designed to withstand direct exposure to the environment.