Final answer:
Non-FR material cannot be counted toward arc flash protection; all layers should be flame-resistant. High-voltage wires are bare, and lightning can travel through trees. So, the statement is false.
Step-by-step explanation:
When dressing in layers for arc flash protection, it is false that non-FR (non-flame-resistant) material can be counted toward your total level of protection. Non-FR materials can potentially ignite and continue to burn, which drastically increases the chance of injury should an arc flash occur. For effective protection, all layers should be flame-resistant to ensure they contribute to the overall thermal protection system.
Regarding the information in your question about high-voltage wires, it is false that these wires are wrapped in an insulating material. High-voltage wires are typically bare and are held aloft by insulating connectors, which prevent electrical current from traveling down the towers to the ground. As for your question about wood and lightning, it is indeed true that although wood is an insulator, lightning can travel through a tree to reach Earth. This is because lightning can travel through the path of least resistance, and a wet tree can provide such a pathway during a thunderstorm, leading to the ground.