Plumbing Terminology, Definitions, and Code Administration
What this domain tests
The opening domain is vocabulary and code administration, because almost every later question turns on a defined term. Nevada plumbing rules rest on the Uniform Plumbing Code (UPC) as adopted and locally amended, so learn definitions in their code form and know who enforces them.
Terms that decide answers
- Shall, should, may - mandatory, advisory, permissive.
- Listed vs. labeled vs. approved - listing is a published evaluation by a recognized agency; the label is the marking on the product; approved means accepted by the authority having jurisdiction (AHJ).
- Accessible vs. readily accessible - accessible means reachable without removing permanent construction; readily accessible means reachable without tools, panels, or climbing.
- Developed length - length measured along the centerline of pipe and fittings.
- Flood level rim - the top edge of a fixture at which water begins to overflow.
- Building drain vs. building sewer - the building drain carries waste to a point 30 inches outside the building wall; beyond that it is the building sewer.
- Cross-connection, backflow, air gap - a physical link, reverse flow, and the unobstructed vertical separation that prevents it.
Worked example
A plan shows a 4-inch line inside a warehouse wall, penetrating the footing, and connecting to a city main 40 feet away. The portion up to 30 inches outside the wall is the building drain, sized by drainage fixture units; the remaining run is the building sewer, subject to the sewer authority standards. Labeling both as building drain is a common plan-review error.
Traps that cost marks
Treating an approved product as automatically listed, confusing accessible with readily accessible, and forgetting that a local amendment overrides the model text whenever a question names a jurisdiction.