Which document can assist in determining if an assembly is two-hour rated?

Which document can assist in determining if an assembly is two-hour rated?

• A. NFPA 70
• B. UL Fire Resistance Directory
• C. NFPA 72
• D. ISO 9001

Answer: (B)

When you need to know if an assembly can resist fire for two hours, you rely on documented, third‑party tested ratings for that specific construction. The UL Fire Resistance Directory is the resource that catalogs these tested assemblies and their fire‑resistance ratings, including two‑hour ratings, along with the exact construction details and installation conditions under which the rating applies. This lets you verify that a given wall, floor, or opening is officially rated for two hours by checking the listed assembly and following its specified requirements. The other documents don’t provide fire‑rating results for building assemblies. NFPA 70 is the Electrical Code, which governs electrical installations. NFPA 72 covers fire alarm systems and signaling. ISO 9001 is a quality management standard.

When you need to know if an assembly can resist fire for two hours, you rely on documented, third‑party tested ratings for that specific construction. The UL Fire Resistance Directory is the resource that catalogs these tested assemblies and their fire‑resistance ratings, including two‑hour ratings, along with the exact construction details and installation conditions under which the rating applies. This lets you verify that a given wall, floor, or opening is officially rated for two hours by checking the listed assembly and following its specified requirements.

The other documents don’t provide fire‑rating results for building assemblies. NFPA 70 is the Electrical Code, which governs electrical installations. NFPA 72 covers fire alarm systems and signaling. ISO 9001 is a quality management standard.