What are the three classes of Standpipe Systems?

• A. Class 1 (2.5 inch for fire service), Class 2 (1.5 inch for occupants), and Class 3 (both 1.5 and 2.5 inch for both)
• B. Class A, Class B, Class C
• C. Residential, Commercial, Industrial
• D. Primary, Secondary, Tertiary

Answer: (A)

Standpipe systems are categorized by who can use them and what size hose connections they provide. The three classes are Class I, Class II, and Class III.

Class I uses 2.5-inch hose connections and is designed for fire department use with attack lines. Class II provides 1.5-inch outlets with preconnected hoses for occupants to use in the early stages of a fire. Class III combines the two concepts: it has both 2.5-inch outlets for firefighters and 1.5-inch outlets for occupants, allowing either group to connect appropriate hoses.

The option that lists these three classes with the correct hose sizes and user groups matches standard standpipe classifications, which is why it’s the best choice. Other options describe different classification schemes or unrelated categories, so they don’t fit standpipe system types.