Detectors spaced to cover a specific floor area are called which type?

• A. Fixed Temperature
• B. Spot Detectors
• C. Line Detectors
• D. Photoelectric

Answer: (B)

Detectors spaced to cover a specific floor area are spot detectors. The idea here is to place individual sensing units at strategic points so that every part of the room or area is within the detector’s reach. Each detector covers a small, defined area, and multiple detectors together provide complete coverage for the space. This approach makes it possible to localize a fire to a particular spot on the floor plan based on which detector alarms.

This is different from line detectors, which monitor along a continuous length (useful in long corridors or ducts). The terms fixed temperature and rate-of-rise describe how heat detectors sense heat, not how detection is distributed across a space, while photoelectric describes the smoke detection method itself, not the layout pattern. So the description perfectly matches the concept of spot detectors.