What type of detector coverage will allow spacing requirements for detectors to be waived?

• A. Full coverage
• B. Nonrequired Coverage
• C. Partial coverage
• D. Required coverage

Answer: (B)

Detector coverage is about how much of a space is protected by detection devices. When the code requires a certain level of coverage (the minimum protection), you must follow the spacing rules to ensure timely detection. If you design with coverage that goes beyond those minimum requirements—nonrequired coverage—the extra detectors provide additional protection not mandated by the code. In that case, the authority having jurisdiction may approve relaxing the usual detector spacing because the overall system still meets or exceeds the needed protection. This flexibility is what allows spacing requirements to be waived when there is nonrequired coverage. Full or partial coverage are not the scenarios that inherently justify waiving spacing; only coverage beyond the minimum (nonrequired) gives that option.