Final answer:
The statement that high-voltage wires wrapped in insulating material are false; they are supported by insulators but use air as the primary insulator.
Step-by-step explanation:
The statement is false. High-voltage wires connected to tall metal-frame towers, also known as transmission towers, are indeed supported by insulating connectors, generally made of materials such as porcelain or glass. However, these wires are not wrapped in an insulating material. The air surrounding the wires serves as the primary insulator, because wrapping such high-voltage wires would be impractical due to cost, weight, and the heat dissipation requirements associated with high-voltage electricity transmission.