What must exist for a sprinkler to be classified as 'listed'?

For a sprinkler to be classified as 'listed,' it must be tested and approved by a recognized testing laboratory. This process ensures that the sprinkler has undergone rigorous testing to meet specific safety and performance standards. The listing indicates that the sprinkler has been evaluated and meets the criteria set forth by authoritative organizations, which is critical for ensuring safety in fire protection systems.

This classification is essential because it provides assurance to installers, building owners, and regulatory bodies that the equipment is reliable and will function as intended in case of a fire. The approval by a recognized laboratory may include tests for temperature sensitivity, water spray distribution, and durability under various conditions, which are all vital for effective fire suppression.

While the installation by a certified technician, visible branding, and conformity to local building codes are important considerations in the overall installation and compliance process, they do not specifically pertain to the initial classification of a sprinkler as 'listed.' Only the testing and approval by an authorized testing entity directly relate to the 'listed' status of a sprinkler.