Final answer:
High-voltage wires on metal-frame towers are held up by insulators but are not wrapped in insulating material; this is false.
Step-by-step explanation:
The statement that high-voltage wires connected to metal-frame towers are held aloft by insulating connectors, and that these wires are wrapped in an insulating material is false. High-voltage transmission lines, which are the wires seen atop tall towers, are designed to carry large amounts of electricity over long distances. While they are indeed held up by insulators to prevent the electric current from grounding, the wires themselves are not wrapped in insulating material. Instead, they are bare and rely on the air gap provided by the insulators and the height above the ground to prevent electrical discharge to nearby objects.