NABCEP PV Commissioning and Maintenance Specialist Flashcards
6 cards from real NABCEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 NABCEP PV Commissioning and Maintenance Specialist flashcards as text
What is the primary purpose of a commissioning inspection for a newly installed PV system?
Answer: To verify the system operates safely and as designed before handover
Commissioning verifies that all components are installed correctly and the system operates safely and per design specifications before being handed over to the owner.
During a PV system commissioning, what is the correct sequence for energizing the system?
Answer: DC side first, then AC side
The DC side is energized first during commissioning so that the inverter can be safely started up after confirming DC voltage and polarity.
Which tool is essential for verifying PV string open-circuit voltage during commissioning?
Answer: Digital multimeter
A digital multimeter measures open-circuit voltage (Voc) of PV strings to confirm they are within expected ranges before connection.
What does an insulation resistance test (megohm test) during commissioning detect?
Answer: Ground faults or damaged insulation in wiring
A megohm test applies high voltage to conductors to detect insulation breakdowns or ground faults that could cause safety hazards.
A PV system's string current reads significantly lower than expected during commissioning. What is the most likely cause?
Answer: A shaded or failed module in the string
A shaded or failed module creates a bottleneck that reduces the entire string's current output below expected levels.
Which document should a commissioning technician provide to the system owner at project closeout?
Answer: As-built drawings, system manual, and commissioning report
As-built drawings, the system manual, and a commissioning report give the owner accurate documentation for operation, maintenance, and future service.