Core TradesQuestion 143 of 700
The discharge pipe from a water heater's temperature-and-pressure (T&P) relief valve must:
a.Connect directly into the building drainage system
b.Terminate to an approved location near the floor without a threaded end, valve, or cap
c.Be capped when not discharging for safety
d.Discharge into the vent stack
Explanation
The T&P discharge pipe must run downward by gravity to an approved point (typically outside or to a drain with an air gap), terminate 6 to 24 inches above the floor, and have no valve, cap, or threaded end that could be plugged. A direct connection, cap, or vent discharge could trap pressure and cause the tank to burst.
Law Reference: 2025 CA Plumbing Code §608.0Practice all 700 questions free — no signup required.
Related questions on this topic
- A 3-inch-diameter horizontal drainage pipe should be installed at a MINIMUM slope of:
- The MOST reliable method to prevent backflow contamination of the potable water supply at a fixture is:
- In a long horizontal drainage line, cleanouts are generally required at intervals not exceeding approximately:
- Excessive water velocity in copper supply piping is primarily a concern because it can cause:
- A fuel-burning furnace located in a confined space requires combustion-air openings primarily to:
- Taking return air for a residential forced-air furnace from a garage is prohibited primarily to prevent:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review