NABCEP Building and Fire Codes 2 — Questions and Answers
Question 1: Under the International Fire Code (IFC), what is the minimum required setback distance for ground-mounted PV arrays from property lines in Exposure Category D areas?
- 3 feet
- 10 feet
- 6 feet
- Determined by the AHJ based on fire flow requirements (Correct answer)
Correct answer: Determined by the AHJ based on fire flow requirements
The IFC requires the AHJ to determine setback distances based on local fire flow requirements and site conditions rather than a single fixed distance.
Question 2: Which IBC occupancy classification typically applies to a standalone ground-mounted PV system with no habitable space?
- Group U (Utility) (Correct answer)
- Group S-1 (Moderate Hazard Storage)
- Group F-1 (Factory Industrial)
- Group H-2 (High-Hazard)
Correct answer: Group U (Utility)
Standalone utility structures such as ground-mounted PV arrays without habitable space are classified as Group U (Utility) under the IBC.
Question 3: The 2021 IFC Section 1204 requires that roof-mounted PV systems on Group R-3 occupancies maintain a minimum pathway width of how many inches on each side of the ridge?
- 18 inches
- 36 inches (Correct answer)
- 12 inches
- 24 inches
Correct answer: 36 inches
The 2021 IFC requires a 36-inch clear pathway on each side of the ridge for firefighter access on Group R-3 roof-mounted PV systems.
Question 4: When PV conduit penetrates a fire-rated floor-ceiling assembly, which protection method is required?
- Standard EMT with locknuts
- Listed firestop system maintaining the assembly rating (Correct answer)
- Rigid metallic conduit only
- Non-metallic conduit with fire caulk
Correct answer: Listed firestop system maintaining the assembly rating
Any penetration through a fire-rated assembly must use a listed firestop system that maintains the hourly rating of that assembly per IBC Section 714.
Question 5: Under NFPA 855, what is the maximum allowable energy capacity for a single energy storage system (ESS) unit installed in a Group R-3 occupancy without additional separation?
- 20 kWh
- 10 kWh (Correct answer)
- 40 kWh
- 5 kWh
Correct answer: 10 kWh
NFPA 855 limits a single ESS unit in Group R-3 occupancies to 10 kWh without additional fire separation or suppression requirements.
Question 6: According to the IFC, a solar-ready zone on a new commercial roof must be free of which of the following to remain compliant?
- HVAC equipment, vents, and skylights (Correct answer)
- Only HVAC equipment
- Only roof drains and scuppers
- Structural supports and parapets
Correct answer: HVAC equipment, vents, and skylights
Solar-ready zones must be kept clear of HVAC equipment, vents, skylights, and other rooftop obstructions to allow future PV installation.
Question 7: Which label or marking is required on the DC conduit of a PV system to alert firefighters to the presence of energized conductors?
- 'WARNING: SOLAR ELECTRIC SYSTEM' at 10-foot intervals
- 'PHOTOVOLTAIC POWER SOURCE' at maximum 10-foot intervals or at each end (Correct answer)
- 'DANGER: HIGH VOLTAGE DC' at 5-foot intervals
- 'CAUTION: PV ARRAY' at 15-foot intervals
Correct answer: 'PHOTOVOLTAIC POWER SOURCE' at maximum 10-foot intervals or at each end
NEC 690.31(G) requires 'PHOTOVOLTAIC POWER SOURCE' labels on PV source and output circuit conduits at maximum 10-foot intervals and at conduit entry and exit points.
NABCEP Building and Fire Codes 2
Under the International Fire Code (IFC), what is the minimum required setback distance for ground-mounted PV arrays from property lines in Exposure Category D areas?