Final answer:
Steel conduit can be used as an equipment grounding conductor, which is true. High-voltage wires are not insulated, which is false. Lightning can travel through a tree, which is also true.
Step-by-step explanation:
The statement that steel conduit may be used as an equipment grounding conductor is True. This is because steel conduit is capable of conducting electrons under fault conditions, making it an effective path for electrical currents to return to the ground in the event of a fault. The grounding of equipment via steel conduit or any other conductor ensures that the device is maintained at zero volts relative to the earth, which is a critical safety feature.
However, when referring to high-voltage power lines, the statement that they are wrapped in an insulating material is False. High-voltage wires carried by tall metal-frame towers are not insulated; instead, they are suspended by insulating connectors to prevent current flow to the structures that hold them aloft.
Additionally, it is True that although wood is generally an insulator, lightning can travel through a tree to reach Earth due to the enormous voltage and energy associated with a lightning strike.