Which type of pipe does not require a special listing to use threaded fittings?

Schedule 40 pipe does not require a special listing to use threaded fittings, as it is a common standard for pipe thickness and is widely used in fire protection systems for its durability and compatibility with standard fittings.

References: Piping standards and fire protection system design practices, where Schedule 40 pipe is a common choice for its balance of strength and workability.