Each heat detector shall be listed for spacing of not less than which distance?

The correct response, which specifies that each heat detector shall be listed for a spacing of not less than 15 meters (50 feet), aligns with established standards for fire alarm systems. Heat detectors are designed to respond to changes in temperature, and their effective operational range is critical for ensuring timely detection in fire scenarios.

This specific spacing guideline is based on the functionality and sensitivity of the heat detectors, ensuring they are optimally positioned to quickly respond to heat from a fire. This spacing allows for adequate coverage in a given area while minimizing the chances of missing a potential fire incident. The established distance also takes into consideration various environmental factors and the characteristic performance of heat detectors.

Choosing an option with a greater spacing, such as 20 meters or 25 meters, may lead to insufficient coverage, where a fire could start and develop before it is detected, increasing the risk of extensive damage or danger. Therefore, knowing and adhering to the appropriate spacing listed for heat detectors is vital in maintaining fire safety standards in any environment.