What does a yellow tag inform the owner regarding the system?

A yellow tag serves as an important indicator for owners regarding the status of a fire suppression system. Specifically, it indicates that the system may not extinguish a typical fire. This is crucial information, as it alerts the owner to potential limitations of the system they are depending on for safety. Understanding that a system marked with a yellow tag may not effectively handle standard fire scenarios encourages vigilance and may prompt the owner to seek improvements or replacements to ensure adequate fire protection.

In this context, the other options do not accurately convey the meaning of a yellow tag. While a system that complies with UL Standard 300 or is fully operational would typically receive a different designation, the yellow tag serves as a warning rather than a confirmation of compliance or efficacy.