What is the term for the main supply line installed parallel to the building's roof structure?

The term for the main supply line installed parallel to the building's roof structure is known as the Cross Main. This terminology is used specifically in fire protection systems, particularly in sprinkler fitting. The Cross Main serves a vital role by distributing water from the primary supply source to the branch lines that feed individual sprinkler heads.

The Cross Main typically runs horizontally across the building and is positioned in a way that it minimizes the risk of collapse and maximizes water distribution efficiency. Understanding the layout and components of a fire sprinkler system is essential for effective installation and maintenance, as proper identification of these components ensures compliance with safety regulations and enhances the overall performance of the fire protection system.

In contrast, the other terms have different meanings within the context of fire sprinkler systems. For example, the Main Line generally refers to the primary source of water supply, while a Riser Nipple connects vertical risers to the horizontal mains but does not describe a main supply line configuration. The Feed Main, while also related to water supply, typically denotes the line that feeds water into a specific zone or area rather than serving as the primary cross structure.