Solar PV System Inspector Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q21When inspecting a PV system, what is the primary purpose of verifying the rapid shutdown labeling?
✓ Correct answer: D. To ensure emergency responders can safely de-energize the system
Rapid shutdown labeling is critical for emergency responder safety, as it identifies how to quickly de-energize the PV system during emergencies, reducing shock hazards for firefighters and other first responders.
Q22Which of the following conductor properties must an inspector verify to ensure proper ampacity ratings in a PV system?
✓ Correct answer: C. Size, insulation type, ambient temperature, and conduit fill
Conductor size, insulation type, ambient temperature, and conduit fill all directly affect the ampacity of conductors in a PV system and must be verified during inspection to ensure they meet code requirements for current-carrying capacity.
Q23An inspector notices that the PV system's AC disconnect is installed in a utility closet behind stored equipment. What code violation is present?
✓ Correct answer: B. The disconnect is not readily accessible as required by code
The National Electrical Code requires disconnects to be readily accessible, meaning they must be capable of being reached quickly without requiring climbing over or removing obstacles, to ensure safe emergency operation.
Q24What is the minimum bending radius requirement when inspecting conduit installation for PV system DC conductors?
✓ Correct answer: A. At least 8 times the conduit diameter
The minimum bending radius for conduits containing DC conductors in PV systems is typically at least 8 times the conduit diameter to prevent damage to the conductors and maintain cable integrity, though specific requirements may vary by conductor type.
Q25During inspection of a grid-tied PV system, what is the maximum allowed voltage that should be measured on exposed metal parts of the array during normal operation?
✓ Correct answer: D. 0V
Properly grounded equipment should have no significant voltage on exposed metal parts. Any voltage above 0V indicates a potential grounding issue that needs to be addressed to prevent shock hazards.
Q26When inspecting the grounding of a PV array, which of the following would be a code violation?
✓ Correct answer: C. Using aluminum grounding conductors in direct contact with soil
Using aluminum grounding conductors in contact with soil is a code violation because aluminum corrodes rapidly when in direct contact with earth, compromising the integrity of the grounding system over time.
Q27What is the correct labeling requirement for a PV system disconnect according to NEC?
✓ Correct answer: B. Permanently marked as 'PV SYSTEM DISCONNECT' with reflective, weather-resistant markings
The NEC requires PV system disconnects to be permanently labeled as 'PV SYSTEM DISCONNECT' with reflective, weather-resistant markings that clearly identify their function for both routine maintenance and emergency situations.
Q28When inspecting conductors in PV source circuits, what is the minimum voltage rating required for these conductors?
✓ Correct answer: A. 1.25 times the maximum system voltage
PV source circuit conductors must have a minimum voltage rating of at least 1.25 times the PV system's maximum voltage to account for voltage increases due to temperature and irradiance changes.
Q29During inspection, you find that a PV array's wiring is subject to physical damage from rodents. What is the correct solution to address this issue?
✓ Correct answer: D. Install the wiring in conduit or raceway rated for physical protection
Using conduit or raceway specifically rated for physical protection is the correct solution for protecting PV system wiring from rodent damage, as it provides a durable barrier against gnawing and other physical hazards.
Q30What must an inspector verify regarding overcurrent protection devices in a PV system?
✓ Correct answer: C. Proper voltage/current ratings, sizing for conductor protection, and accessibility
An inspector must verify that overcurrent protection devices are properly rated for both voltage and current requirements of the circuit, correctly sized for conductor protection, and installed in accessible locations to ensure safe operation and maintenance.
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