Which standard is referenced for burglar-inaccessible openings?

• A. UL 681
• B. NFPA 70
• C. ISO 9001
• D. IEEE 802.11

Answer: (A)

Burglar-inaccessible openings rely on burglary-resistant hardware that meets a recognized standard. UL 681 sets the requirements and test methods for such hardware used on doors and windows—things like locks, strike plates, hinges, and door reinforcements. It specifies how these components are evaluated to resist forced-entry techniques such as prying, hammering, or kicking, giving openings a verifiable level of security. In alarm system practice, referencing UL 681 ensures that the protected opening meets a defined burglary-resistance standard, which is why this choice is the best fit. The other options cover electrical wiring, quality management, and wireless networking, which aren’t about securing openings against burglary.