ICC CALIFORNIA COMMERCIAL PLUMBING PLAN
EXAMINER EXAM QUESTIONS AND CORRECT ANSWER
WITH EXPLANATION GRADED A+ STUDY GUIDE LATEST
2026 UPDATE 100% CORRECT
1.
The primary purpose of commercial plumbing plan review is to ensure:
A. Compliance with California Plumbing Code (CPC)
B. Furniture layout approval
C. Interior design approval
D. Landscaping approval
Answer: A
Plumbing plan review ensures safe, sanitary, and code-compliant systems.
2.
The California Plumbing Code is found in:
A. Title 24, Part 5
B. Title 24, Part 4
C. Title 24, Part 3
D. Title 24, Part 6
Answer: A
CPC is Part 5 of Title 24.
3.
Commercial plumbing systems include:
A. Water supply, drainage, venting, storm drainage, and gas systems
B. Electrical systems
C. HVAC systems only
D. Structural systems
Answer: A
Plumbing covers multiple water and waste systems.
,4.
A plumbing plan examiner primarily reviews:
A. Pipe sizing, fixture counts, venting, and system layout
B. Furniture layout
C. Interior design
D. Landscaping
Answer: A
Focus is on plumbing system compliance.
5.
Fixture units are used to:
A. Size plumbing systems based on demand
B. Size electrical systems
C. Size HVAC systems
D. Size structural systems
Answer: A
Fixture units determine hydraulic load.
6.
Drainage systems are designed to operate primarily by:
A. Gravity flow
B. Pressure pumps only
C. Electrical force
D. HVAC airflow
Answer: A
Gravity is the main drainage method.
7.
The minimum slope for horizontal drainage piping is typically:
A. 1/4 inch per foot (smaller pipes)
B. 0 slope
C. 1/2 inch per foot always
D. Negative slope
, Answer: A
Proper slope ensures flow.
8.
The purpose of a vent system is to:
A. Protect trap seals and maintain air balance
B. Increase water pressure
C. Store wastewater
D. Filter water
Answer: A
Vents maintain proper drainage function.
9.
A trap in plumbing is designed to:
A. Prevent sewer gases from entering buildings
B. Increase flow rate
C. Store water
D. Improve pressure
Answer: A
Trap seal blocks sewer gases.
10.
Backflow prevention devices protect:
A. Potable water from contamination
B. Electrical systems
C. HVAC systems
D. Structural systems
Answer: A
Backflow prevention is a health safeguard.
11.
EXAMINER EXAM QUESTIONS AND CORRECT ANSWER
WITH EXPLANATION GRADED A+ STUDY GUIDE LATEST
2026 UPDATE 100% CORRECT
1.
The primary purpose of commercial plumbing plan review is to ensure:
A. Compliance with California Plumbing Code (CPC)
B. Furniture layout approval
C. Interior design approval
D. Landscaping approval
Answer: A
Plumbing plan review ensures safe, sanitary, and code-compliant systems.
2.
The California Plumbing Code is found in:
A. Title 24, Part 5
B. Title 24, Part 4
C. Title 24, Part 3
D. Title 24, Part 6
Answer: A
CPC is Part 5 of Title 24.
3.
Commercial plumbing systems include:
A. Water supply, drainage, venting, storm drainage, and gas systems
B. Electrical systems
C. HVAC systems only
D. Structural systems
Answer: A
Plumbing covers multiple water and waste systems.
,4.
A plumbing plan examiner primarily reviews:
A. Pipe sizing, fixture counts, venting, and system layout
B. Furniture layout
C. Interior design
D. Landscaping
Answer: A
Focus is on plumbing system compliance.
5.
Fixture units are used to:
A. Size plumbing systems based on demand
B. Size electrical systems
C. Size HVAC systems
D. Size structural systems
Answer: A
Fixture units determine hydraulic load.
6.
Drainage systems are designed to operate primarily by:
A. Gravity flow
B. Pressure pumps only
C. Electrical force
D. HVAC airflow
Answer: A
Gravity is the main drainage method.
7.
The minimum slope for horizontal drainage piping is typically:
A. 1/4 inch per foot (smaller pipes)
B. 0 slope
C. 1/2 inch per foot always
D. Negative slope
, Answer: A
Proper slope ensures flow.
8.
The purpose of a vent system is to:
A. Protect trap seals and maintain air balance
B. Increase water pressure
C. Store wastewater
D. Filter water
Answer: A
Vents maintain proper drainage function.
9.
A trap in plumbing is designed to:
A. Prevent sewer gases from entering buildings
B. Increase flow rate
C. Store water
D. Improve pressure
Answer: A
Trap seal blocks sewer gases.
10.
Backflow prevention devices protect:
A. Potable water from contamination
B. Electrical systems
C. HVAC systems
D. Structural systems
Answer: A
Backflow prevention is a health safeguard.
11.
