What describes flexible conduit that can be metallic or non-metallic?

Flexible conduit refers to a type of electrical raceway that can be either metallic or non-metallic, allowing for a versatile application in various environments. This type of conduit is designed to protect and route electrical wiring while providing the agility needed to navigate around obstacles in both residential and commercial installations.

The term "flexible conduit" inherently indicates that it is made to be bendable and adaptable, making it suitable for installations where rigid conduit would be impractical. This could include areas with limited space or where the run of the wiring needs to change direction frequently.

The options presented, such as flexible duct and flexible tubing, do not specifically pertain to electrical raceways, making them less accurate descriptors of the conduit in question. Rigid conduit, as implied by its name, does not offer the flexibility characteristic of the correct choice. Hence, the identification of flexible conduit as the correct answer reflects its unique properties that meet the criteria outlined in the question.