What defines the branch line in a sprinkler installation?

The branch line in a sprinkler installation is defined as the piping system that supplies the sprinklers themselves. This component is vital because it connects directly to the main lines and distributes water to individual sprinkler heads. The branch line plays a crucial role in ensuring that each sprinkler receives the appropriate amount of water for effective fire suppression.

The branch lines are responsible for extending off the main supply lines, allowing for flexibility in the layout of the sprinkler system according to the building's needs. A well-designed branch line ensures that all areas requiring coverage are met, which is critical for adhering to fire safety standards and codes.

Other options do not accurately depict what a branch line is. For example, connecting only to feed mains describes elements of the system but doesn't encompass the role of delivering water to sprinklers. The main water reservoir represents the source of water but does not define the branch line. Similarly, a backup water supply is important for system reliability but is not related to the branch lines' function of distributing water. Therefore, the correct understanding of what constitutes a branch line highlights its significance in the overall sprinkler system design.