CPD Codes, Regulations, & Standards 3 — Questions and Answers
Question 1: Per the IPC, what is the maximum developed length of a trap arm from trap weir to vent for a 1.5-inch drain?
- 3.5 feet
- 5 feet (Correct answer)
- 6 feet
- 8 feet
Correct answer: 5 feet
The IPC limits the trap arm length for a 1.5-inch pipe to 5 feet from the trap weir to the vent.
Question 2: AWWA C651 covers which of the following plumbing/piping-related subjects?
- Disinfecting water mains (Correct answer)
- Backflow prevention assembly testing
- Cross-connection control
- Water meter installation
Correct answer: Disinfecting water mains
AWWA C651 is the standard for disinfecting water mains, covering chlorination procedures after installation or repair.
Question 3: Which ASSE standard applies to the performance of reduced pressure principle backflow preventers?
- ASSE 1013 (Correct answer)
- ASSE 1015
- ASSE 1020
- ASSE 1047
Correct answer: ASSE 1013
ASSE 1013 establishes performance requirements for reduced pressure principle backflow preventers (RP assemblies).
Question 4: Under the IPC, a sanitary drainage system discharging into a public sewer requires what minimum grade for a 4-inch horizontal drain?
- 1/16 inch per foot
- 1/8 inch per foot (Correct answer)
- 1/4 inch per foot
- 1/2 inch per foot
Correct answer: 1/8 inch per foot
The IPC requires 4-inch horizontal sanitary drains to slope a minimum of 1/8 inch per foot toward the point of discharge.
Question 5: Which code body adopts and publishes the Uniform Plumbing Code (UPC)?
- ICC
- IAPMO (Correct answer)
- NFPA
- ASPE
Correct answer: IAPMO
The International Association of Plumbing and Mechanical Officials (IAPMO) publishes and maintains the Uniform Plumbing Code.
Question 6: What EPA regulation establishes maximum contaminant levels (MCLs) for public drinking water systems?
- Safe Drinking Water Act (SDWA) (Correct answer)
- Clean Water Act (CWA)
- Resource Conservation and Recovery Act (RCRA)
- Comprehensive Environmental Response Act (CERCLA)
Correct answer: Safe Drinking Water Act (SDWA)
The Safe Drinking Water Act authorizes the EPA to set maximum contaminant levels for public water systems.
Question 7: Per IPC Table 709.1, what is the drain fixture unit (DFU) value assigned to a residential clothes washer standpipe?
- 2 DFU
- 3 DFU (Correct answer)
- 4 DFU
- 6 DFU
Correct answer: 3 DFU
IPC Table 709.1 assigns a drain fixture unit value of 3 DFU to a residential clothes washer standpipe.
CPD Codes, Regulations, & Standards 3
Per the IPC, what is the maximum developed length of a trap arm from trap weir to vent for a 1.5-inch drain?