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

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

2. A system commissioning test requires verifying rapid shutdown functionality. What is the maximum time allowed for voltage to drop below 30V per NEC 690.12?

A) 20 seconds
B) 10 seconds
C) 60 seconds
D) 30 seconds

3. A maintenance inspection reveals cracked module glass. What is the immediate action?

A) Replace the module
B) Apply sealant to cracks
C) Disconnect the string
D) Monitor performance

4. When installing a ground-mounted PV array, which of the following grounding methods complies with NEC Article 690 requirements for equipment grounding?

A) Connecting the module frames to the racking with bare copper wire only
B) Installing a ground-fault circuit interrupter (GFCI) on the DC side of the system
C) Using a grounding electrode conductor connected to a separate ground rod for each array
D) Bonding all metal parts to the equipment grounding conductor tied to the main service ground

5. A PV system equipped with rapid shutdown requires a label stating ''RAPID SHUTDOWN SWITCH FOR SOLAR PV SYSTEM''.
Which is the BEST description of where this label is required?

A) On or within 3 ft. of the ac disconnect
B) On or within 3 ft. of the ac disconnect
C) On or within 3 ft. of the ac disconnect
D) On or within 3 ft. of the ac disconnect

Solutions: