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

1. According to the 2020 National Electrical Code (NEC), what is the minimum required working clearance in front of a 1000V DC PV inverter installed in a non-dwelling unit?

A) 36 inches wide, 36 inches deep
B) 30 inches wide, 36 inches deep
C) 48 inches wide, 48 inches deep
D) 36 inches wide, 48 inches deep

2. An installer troubleshooting a ground-mounted array finds It to be performing as expected most of the time, but a ground-fault error is indicated on hot days. The inverter is in a shaded location. Which of the following should the installer check for FIRST when troubleshooting this array?

A) High voltage
B) Intermittent ground connections
C) Pinched module wiring
D) Loose module connections

3. A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of the switch are 440 on string #1, 444V on string #2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are 3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?

A) A ground fault is causing the current from strings #1 and #2 to flow into string #3.
B) String #3 has an open connection and is not contributing any voltage.
C) There is lower module mismatch in string #3 than in string #1 and #2.
D) Positive and negative output conductors of string #3 are faulted together.

4. A PV array is installed on a sloped roof with a 6:12 pitch. What is the minimum fastener pullout strength required if the uplift force is 200 lbs per attachment point?

A) 200 lbs
B) 400 lbs
C) 600 lbs
D) 300 lbs

5. A PV system operates at 800V DC. What is the minimum distance for unqualified personnel per NFPA 70E restricted approach boundary?

A) 7 feet
B) 10 feet
C) 3 feet
D) 1 foot

Solutions: