Final answer:
The statement about not leaving fibre cord slack during Invisilight installation is true, as slack can cause damage and inefficiency. However, the statement about high-voltage wires being wrapped in insulating material is false; they are actually bare and separated by distance and insulators.
Step-by-step explanation:
The statement that you should not leave fibre cord slack while installing Invisilight is true. Leaving slack can lead to sagging or loops that can interfere with the installation and cause damage or inefficiency. Optimal installation requires managing the cord tension to prevent slack. This is important to ensure the fibre is protected and performs well over time.
When it comes to high-voltage wires, the statement is false. These wires are indeed held aloft by insulating connectors called insulators, but they are not wrapped in insulating material. The wires are bare because they are located at a considerable height and far from each other and objects, which minimizes the risk of electrical current leakage in the air.