Heat detectors must be approved for a spacing of not less than what distance within a family unit?

Heat detectors are essential components of fire alarm systems, and they must be installed according to specific guidelines to ensure they function effectively within residential settings. The requirement for a minimum spacing when installing heat detectors helps ensure that they can properly detect changes in temperature indicative of a fire.

The correct spacing of no less than 50 feet ensures that the detectors are positioned close enough to any potential heat sources that could indicate a fire while also allowing them to minimize false alarms that can result from environmental changes. This standard also balances coverage area with the characteristics of heat detectors, ensuring they can respond accurately to actual fire events without being triggered by routine temperature fluctuations.

In the context of the other options, spacing that is too short would not provide adequate area coverage, and spacing that is excessively long could result in gaps where fires might go undetected. Therefore, the established minimum of 50 feet is critical for ensuring both safety and functionality within family units.