Where are main sprinkler system valves usually installed?

• A. On the main riser, above the water supply control valve
• B. In the building's electrical panel
• C. In the mechanical room ceiling
• D. Outside near the street

Answer: (A)

Access and quick isolation of the sprinkler system drive valve placement. The main valve is put on the main riser, above the water supply control valve, so there’s a single, clear point to shut off water to the entire sprinkler system while keeping access straightforward for firefighters or maintenance staff. Keeping it in a dedicated valve area or mechanical room protects it and makes it easy to reach, without affecting other building water services. Placing valves in an electrical panel isn’t appropriate for safety and function, overhead in a ceiling is impractical to access during a incident, and outside near the street exposes the valve to weather, tampering, and damage.