Free IPC Plumbing Fixtures and Fittings Questions and Answers — Questions and Answers
Question 1: A plumber is installing a new bathroom group. According to the IPC, what is the minimum required clearance from the centerline of a water closet to a side wall or partition?
- 21 inches
- 30 inches
- 15 inches (Correct answer)
- 18 inches
Correct answer: 15 inches
IPC Section 405.3.1 specifies that the minimum distance from the center of a water closet to any side wall, partition, vanity, or other obstruction shall be not less than 15 inches. This ensures adequate space for access and use.
Question 2: Which of the following is a requirement for individual shower valves according to the IPC to protect against scalding?
- They must be manually-operated gate valves.
- They must be equipped with an in-line thermostatic valve.
- They are not required to have temperature-limiting devices.
- They must be of a balanced-pressure, thermostatic, or combination type. (Correct answer)
Correct answer: They must be of a balanced-pressure, thermostatic, or combination type.
IPC Section 412.3 mandates that individual shower and tub-shower combination valves be of the balanced-pressure, thermostatic, or combination balanced-pressure/thermostatic type conforming to ASSE 1016/ASME A112.1016/CSA B125.16 or ASME A112.18.1/CSA B125.1. These valves are designed to automatically compensate for pressure and temperature fluctuations to prevent scalding. In-line thermostatic valves are specifically prohibited for this application.
Question 3: When installing a domestic dishwasher, the drainage hose is connected to the kitchen sink drain. To prevent backflow from the sink into the dishwasher, what does the IPC require?
- A direct connection with a minimum 1-inch diameter hose.
- A flexible connector with a shutoff valve.
- A high loop in the drain hose or an air gap fitting. (Correct answer)
- A connection to a separate floor drain.
Correct answer: A high loop in the drain hose or an air gap fitting.
IPC Section 409.3 requires a dishwasher drain to connect to a wye fitting between the sink trap and the tailpiece, or to the disposal. To prevent backflow, the drain must either rise to the underside of the counter (a high loop) or be connected through an approved air gap fitting installed on the countertop.
Question 4: A bidet is being installed in a residential bathroom. What is the maximum allowable water temperature for the bidet fitting, as specified by the IPC?
- 100°F (38°C)
- 110°F (43°C) (Correct answer)
- 120°F (49°C)
- 140°F (60°C)
Correct answer: 110°F (43°C)
According to IPC Section 408.3, the discharge water temperature from a bidet fitting must be limited to a maximum of 110°F (43°C) by a water-temperature-limiting device. This is a safety measure to prevent scalding.
Question 5: The waste from a residential automatic clothes washer discharges into a standpipe. According to the IPC, the fixture drain for this standpipe must connect to a branch drain or stack of what minimum diameter?
- 1 1/2 inches
- 2 inches
- 3 inches (Correct answer)
- 4 inches
Correct answer: 3 inches
IPC Section 406.2 states that while the standpipe and its trap can be 2 inches, the fixture drain for the automatic clothes washer must connect to a branch drain or stack that is a minimum of 3 inches in diameter. This is to handle the high-volume, sudsy discharge from the appliance.
Question 6: Which of the following plumbing fixtures is explicitly prohibited by the International Plumbing Code?
- Water closets with a flush volume of 1.6 gallons.
- Wall-hung urinals.
- Trough urinals. (Correct answer)
- Bidets with hot and cold water supply.
Correct answer: Trough urinals.
IPC Section 401.2 explicitly prohibits the installation of trough urinals. This is primarily due to sanitary concerns, as they are more difficult to clean and maintain than individual fixtures.
Free IPC Plumbing Fixtures and Fittings Questions and Answers
A plumber is installing a new bathroom group.
According to the IPC, what is the minimum required clearance from the centerline of a water closet to a side wall or partition?