Three underground systems converge at similar elevations. Which verification prevents a wrong material or system connection?
- AUse the shortest pipe for every system for the described plumbing system and documented site conditions
- BConnect by outside diameter alone
- Verify layout, elevation, material, and identity before joining
- DWait until fixtures fail
Why C is correct
The best answer is: Verify layout, elevation, material, and identity before joining. Similar-looking piping can serve potable, reclaimed, gas, drainage, or fire systems with different requirements. Positive identification and coordinated layout prevent cross-connections and costly concealed rework. The transferred field condition applies the same plumbing design, installation, service, or safety principle to a different project setting. The alternatives omit a prerequisite, conflict with the approved method, or fail to control the stated sanitation or physical hazard.