Final answer:
A UL-listed power strip cannot be series-connected to other power strips or to extension cords.
Step-by-step explanation:
A UL-listed power strip cannot be series-connected to other power strips or to extension cords. This statement is true.
UL stands for Underwriters Laboratories, which is an independent testing organization that sets safety standards for electrical devices. UL-listed power strips are certified to meet certain safety requirements, and one of those requirements is that they should not be connected in a series. Series connecting power strips can lead to overloading and overheating, which can be a fire hazard.
To ensure the safe use of power strips, it is important to follow the manufacturer's instructions and guidelines.