Which standard is referenced for firestop system testing?

• A. UL 1479
• B. UL 910
• C. NFPA 101
• D. NFPA 70

Answer: (A)

Firestop system testing is governed by a standard that defines how to verify performance under fire. UL 1479 is that standard because it specifies the test methods, fixture configurations, and acceptance criteria for firestop assemblies—through-penetrations and joints—so their ability to resist flame, heat, and gas passage is proven under controlled fire exposure. This is what determines a firestop’s listed rating and reliability in real-world fire conditions. Other items listed are codes or standards that address safety requirements (like life safety or electrical installations) or cover different topics, not the testing method for firestop assemblies, so they aren’t the reference used for firestop testing.