NFPA NFPA 13 Sprinkler Systems 1 — Questions and Answers
Question 1: What is the minimum water supply duration required for a light hazard occupancy sprinkler system under NFPA 13?
- 15 minutes
- 30 minutes (Correct answer)
- 60 minutes
- 90 minutes
Correct answer: 30 minutes
NFPA 13 requires a minimum water supply duration of 30 minutes for light hazard occupancies.
Question 2: According to NFPA 13, what is the maximum spacing allowed between standard spray upright or pendent sprinklers in light hazard occupancies?
- 100 sq ft
- 130 sq ft
- 200 sq ft (Correct answer)
- 225 sq ft
Correct answer: 200 sq ft
NFPA 13 permits a maximum coverage area of 200 square feet per sprinkler in light hazard occupancies.
Question 3: Under NFPA 13, what type of sprinkler system uses air pressure to hold water back until a sprinkler activates?
- Wet pipe system
- Dry pipe system (Correct answer)
- Deluge system
- Preaction system
Correct answer: Dry pipe system
A dry pipe system uses pressurized air or nitrogen to hold the water back in the supply piping until a sprinkler head opens.
Question 4: What is the minimum clearance required between the deflector of a sprinkler head and the top of storage under NFPA 13?
- 6 inches
- 12 inches
- 18 inches (Correct answer)
- 36 inches
Correct answer: 18 inches
NFPA 13 requires a minimum 18-inch clearance between the sprinkler deflector and the top of storage.
Question 5: According to NFPA 13, which occupancy classification applies to offices, schools, and churches?
- Extra hazard
- Ordinary hazard Group 1
- Ordinary hazard Group 2
- Light hazard (Correct answer)
Correct answer: Light hazard
Offices, schools, and churches are classified as light hazard occupancies under NFPA 13.
Question 6: Under NFPA 13, what is the maximum distance allowed between a sprinkler and a wall or obstruction in a light hazard occupancy?
- 4 feet
- 7.5 feet (Correct answer)
- 9 feet
- 12 feet
Correct answer: 7.5 feet
NFPA 13 limits the distance from a sprinkler to a wall or partition to a maximum of 7.5 feet in light hazard occupancies.
NFPA NFPA 13 Sprinkler Systems 1
What is the minimum water supply duration required for a light hazard occupancy sprinkler system under NFPA 13?