What does the term "listed" indicate regarding equipment or materials?

The term "listed" indicates that equipment or materials have been evaluated and found to comply with specific safety standards or regulations established by a recognized testing laboratory. This means they have undergone rigorous testing and have met the necessary criteria for performance and safety. Products that are listed are typically marked with a label or listing number, indicating that they are suitable for use in a particular application and safe for consumers.

For instance, electrical components that are listed have been tested for their ability to handle specific electrical loads, resist fire hazards, or function under particular environmental conditions. This designation is crucial for ensuring that consumers and professionals can trust the safety and reliability of the products they use. This concept is foundational in electrical work, as using listed equipment helps prevent accidents and ensure compliance with building codes and safety regulations.