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

1. 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) Ungrounded conductors are conducing current event the ground-fault device has activated.
D) Cracked insulation has allowed water intrusion that resulted in oxidation of the copper conductors.

2. A 20 kW array has a measured output of 16 kW at 800 W/m² irradiance. What is the performance loss due to irradiance?

A) 10%
B) 30%
C) 20%
D) 25%

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

A) Installing a ground-fault circuit interrupter (GFCI) on the DC side of the system
B) Connecting the module frames to the racking with bare copper wire only
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

4. According to the NEC, where on a residential PV system MUST the labeling describing the type of rapid shutdown be located?

A) A close as practicable to the PV array requiring rapid shutdown
B) On the rapid shutdown initiation device.
C) On or no more than 1 m (3. 3 ft) from the service disconnecting meant
D) At point on the residence designated by the AKJ and fire marshal

5. Which of the following tests measures axial uplift when performing load testing of driven-pile foundation members

A) Resistance to twisting
B) Resistance to withdraw (pull-out) force
C) Resistance to downward (Sinking force
D) Resistance to horizontal movement

Solutions: