What is the maximum distance allowed between sprinkler heads that are located 12'6" apart along a branch line?

When determining the maximum distance allowed between sprinkler heads along a branch line, it's essential to consider the spacing guidelines set forth in the applicable codes and standards. The maximum spacing is often dictated by the type of system being installed and the coverage requirements for the specific type of sprinkler heads being used.

In this scenario, the correct choice states that the maximum spacing between the sprinkler heads is 10.4 feet when they are located 12 feet 6 inches apart along a branch line. This reflects typical spacing standards that ensure adequate coverage for each head while maintaining effective water distribution for fire protection.

According to NFPA 13, the National Fire Protection Association's standard for the installation of sprinkler systems, the distance allowed between sprinkler heads may vary depending on the specific application and system design, but 10.4 feet aligns well with the spacing recommendations.

Thus, this choice reflects adherence to design parameters ensuring optimal performance of the sprinkler system, therefore ensuring that each area receives sufficient water in case of a fire.