What is classified as a branch in plumbing terms?

In plumbing terminology, a branch refers to any section of piping that diverges from the main lines, which include risers, mains, or stacks. Branches are crucial in distributing water to various fixtures within a building, such as sinks, toilets, and showers. They connect to the larger supply or drainage system and are critical for the overall functioning of plumbing systems.

The choices provided include components that represent either primary systems or lines without the characteristic of being a branch. For instance, the main sewer line, the drain exiting the building, and the main water supply are all principal lines that do not function as branches. Therefore, a branch is accurately defined as any piping other than these key components such as risers, mains, or stacks, which is why identifying it as such is crucial in understanding plumbing systems.