Fixtures and Fixture Fittings
Fixtures and Fixture Fittings tests whether you can select and install plumbing fixtures to meet minimum facility counts, clearance dimensions, accessibility rules, and fixture-specific requirements. The exam expects you to apply occupancy tables and dimension checks rather than just know fixture names.
Minimum facilities
Table 403.1 establishes the minimum number of water closets, lavatories, bathtubs or showers, and drinking fountains by occupancy. Separate facilities are typically required for each sex, with exceptions for small occupancies and certain uses. Food-handling areas need a handwashing lavatory located for convenient use.
Clearances and installation
Water closets require a 15-inch centerline distance from a side wall, at least 15 inches from an adjacent fixture, a 30-inch clear width, and 21 inches of clear space in front under IPC 405.3.1. Fixtures must be securely fastened, level, and installed with approved connections. Accessible fixtures must also meet ICC A117.1, including knee and toe clearance at lavatories and an accessible route.
Worked example
A toilet room is 34 inches wide, with the water closet centered at 17 inches from each side wall, and the front wall is 19 inches from the bowl. The 17-inch centerline satisfies the 15-inch rule, but the 19-inch front clearance fails the 21-inch requirement. The room must be reconfigured or enlarged; the width alone does not make it compliant.
Traps that cost marks
Candidates measure room width but forget the 15-inch centerline requirement. They also forget the 21-inch front clearance and the 30-inch clear width. Another common error is counting a fixture as accessible without checking A117.1 clear floor space and knee clearance.