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NABCEP PV Installation Professional (PVIP) Board Certification Sample Questions:

1. A 15 kW system has a total derate factor of 0.87. After 3 years at 1% degradation/year, what is the output?

A) 12.8 kW
B) 12.6 kW
C) 13.2 kW
D) 13.0 kW

2. A system's inverter efficiency drops from 97% to 94% due to aging. What is the percentage increase in energy loss?

A) 3.2%
B) 2.1%
C) 6.0%
D) 4.5%

3. During a PV system inspection, an installer notices that the rapid shutdown system fails to de-energize the array within 30 seconds of initiation. What is the most likely cause based on NEC 690.12 requirements?

A) The array conductors exceed the maximum allowable voltage
B) The system lacks a compatible rapid shutdown device
C) The rapid shutdown switch is installed more than 10 feet from the array
D) The inverter is not listed for rapid shutdown compliance

4. An installer is hired to troubleshoot a 10-year-old roottop system with open-circuit voltage of 300V. The ground-fault detection (GFD) device has tripped. The insulation on the exposed source circuit cables has deterlorated with multiple cracks and has no flexibility. Which concern is the MOST likely safely issue when servicing this array?

A) Insulation has become an electrical conductor since it has changed its composition.
B) Short-circuit current is present at the PV source-circuit terminals of the disconnect device because of electrical leakage.
C) Cracked insulation has allowed water intrusion that resulted in oxidation of the copper conductors.
D) Ungrounded conductors are conducing current event the ground-fault device has activated.

5. A PV system interconnects at a 480V three-phase service. The inverter output current is 20A per phase. What is the minimum size of the equipment grounding conductor (EGC) per NEC 250.122 if the OCPD is 30A?

A) 8 AWG
B) 12 AWG
C) 14 AWG
D) 10 AWG

Solutions: