The vertical distribution of devices across floors in drawings is most commonly shown by a

• A. Floor plan
• B. Riser
• C. Elevation
• D. Section

Answer: (B)

Riser diagrams are used to show how a fire alarm or similar system runs vertically through a building. In a multi-story building, you need to see which devices are on each floor and how the wiring or communication paths climb from floor to floor. The riser lays out that vertical network, typically with one or more vertical lines representing the shaft or conduits and markers for devices on each level. This makes it clear where devices are located from floor to floor and how they connect to the control panel and power or signaling circuits.

Floor plans show the layout of a single floor, not how the system spans multiple levels. Elevations depict exterior faces or vertical dimensions of the building, not the internal routing of devices across floors. Sections cut through the building to reveal internal relationships, but they don’t provide the ongoing vertical distribution of the system across all levels. The riser is the diagram that specifically communicates that vertical distribution.