If a door release detector is listed for door frame mounting, how many detectors are required if installed according to the manufacturers published instructions?

If a door release detector is listed for door frame mounting, how many detectors are required if installed according to the manufacturers published instructions?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (A)

When a device is listed for a specific mounting method, the installation must follow that listing and the manufacturer’s published instructions. If a door release detector is approved for door frame mounting, a single detector is designed to monitor the release action at that frame location. The listing and instructions specify that one detector is sufficient to achieve the intended monitoring without redundancy or overlap, as long as it’s installed exactly as shown. Using more detectors isn’t required here unless the listing or the door design calls for additional points of monitoring. So, following the manufacturer’s guidance for door frame mounting means you install one detector, which is why that choice is the best answer.

When a device is listed for a specific mounting method, the installation must follow that listing and the manufacturer’s published instructions. If a door release detector is approved for door frame mounting, a single detector is designed to monitor the release action at that frame location. The listing and instructions specify that one detector is sufficient to achieve the intended monitoring without redundancy or overlap, as long as it’s installed exactly as shown.

Using more detectors isn’t required here unless the listing or the door design calls for additional points of monitoring. So, following the manufacturer’s guidance for door frame mounting means you install one detector, which is why that choice is the best answer.