NABCEP PV Installation Professional (PVIP) Board Certification

QUESTION NO: 1
A PV array is installed with a rapid shutdown system per NEC 690.12. The array is 15 feet from the service entrance. What is the maximum voltage allowed within the array boundary 30 seconds after shutdown initiation?

A. 120V B. 30V C. 80V D. 240V

Correct Answer: B

QUESTION NO: 2
A system's inverter efficiency drops from 97% to 94% due to aging. What is the percentage increase in energy loss?

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

Correct Answer: C

QUESTION NO: 3
The NEC requires that PV systems installed on dwellings incorporate which of the following components?

A. A lockable utility disconnect at the point-of-utility interconnection B. A dc ground-fault protect device C. Dc lightning surge arrestors D. Blocking diodes across each module

Correct Answer: A

QUESTION NO: 4
A 10 kW PV system produces 8 kW AC under STC. After one year, output drops to 7.2 kW. What is the most likely maintenance issue?

A. Soiling on modules B. Module degradation C. Loose connections D. Inverter inefficiency

Correct Answer: A

QUESTION NO: 5
A module's Voc is 40V at STC. At -5°C with a coefficient of -0.33%/°C, what is the Voc?

A. 43.0V B. 42.0V C. 44.0V D. 45.0V

Correct Answer: C

QUESTION NO: 6
In the middle of a winter day, the data acquisition system for a ground-mounted PV system with large central inverters sends an email alert that system performance is at 50% based on irradiance and temperature performance calculations. No inverters are completely offline. The closed technician is a 4-hour drive from the site, and there are no cameras on site. Which is the BEST response to this situation?

A. Call the data acquisition company to report a monitoring system failure. B. Dispatch the technician to the site t investigate the low performance issue in person. C. Review power output and weather conditions via the monitoring portal, and review local weather reports. D. Report the low performance to the inverter manufacturer and request that a technical be sent to the site for a warranty claim.

Correct Answer: C

QUESTION NO: 7
An installer is working on a 1000V DC PV array. What is the minimum PPE required per NFPA 70E for arc flash protection?

A. Category 3 PPE B. Category 4 PPE C. Category 2 PPE D. Category 1 PPE

Correct Answer: C

QUESTION NO: 8
A system's inverter output is 9 kW at 900 W/m² irradiance. What is the expected output at 1000 W/m²?

A. 10.0 kW B. 10.5 kW C. 11.0 kW D. 9.5 kW

Correct Answer: A

QUESTION NO: 9
A ground-mounted PV system operating with an open-critical voltage of 550V is in a public park. Which installation procedure will meet NEC requirements for protecting the public from potential electric shock?

A. Install PV modules with plastic, insulating the frames, and connect to a grounding electrode at the array. B. Ground the PV module frames, but not the mounting racks, to local grounding electrodes. C. Mount the PV modules on a one-axis (north-south) tracker, with supporting structures listed to UL 2703. D. Install a physical barrier on the back of the PV modules that prevent that prevents the conductors from being touched.

Correct Answer: D

QUESTION NO: 10
A connector not listed to be used in a concealed location and being used as a disconnect for PV equipment shall comply with which of the following?

A. The grounding member shall be interconnectchangeable with receptacles in other electrical systems. B. The grounding member shall be last to make and first to break contact with the mating connector C. The connector shall have a non-polarized configuration. D. The connector shall be installed so as to guard against inadvertent with live parts by persons.

Correct Answer: D

QUESTION NO: 11
A ground resistance measurement on a newly installed grounding electrode indicates a resistance of 130#. The earth connection may be improved by connecting the existing electrode to a:

A. Buried water piping system using 40 ft. of 2 in. PVC piping located 10 ft awat. B. Supplemental copper plated steel grounding electrode located 8 ft, away. C. Supplement ¼ in, in thick aluminum plate electrode buried 30 in. down and located 7 ft, away. D. Supplemental grounding electrode located 5 ft, away.

Correct Answer: B

QUESTION NO: 12
A rooftop PV system is proposed for a commercial building with a membrane roof. The structural engineer specifies a maximum allowable dead load of 5 psf. The PV modules weigh 3 psf, and the racking adds 1.5 psf.
What additional load can be added without exceeding the limit?

A. 1.5 psf B. 0 psf C. 1.0 psf D. 0.5 psf

Correct Answer: D

QUESTION NO: 13
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. Short-circuit current is present at the PV source-circuit terminals of the disconnect device because of electrical leakage. B. Ungrounded conductors are conducing current event the ground-fault device has activated. C. Cracked insulation has allowed water intrusion that resulted in oxidation of the copper conductors. D. Insulation has become an electrical conductor since it has changed its composition.

Correct Answer: D

QUESTION NO: 14
A PV system was installed in July 2017 under the 2017 NEC. The system has a string inverter located inside a garage on a wall 10 ft, from the outside wall and 1oft, from the ac load center at the point of utility connection. The PV system has a PV array on the roof. Which of the following represents the PV rapid shutdown system requirement for the controlled PV system conductors associated with this PV array?

A. More than 1 ft, from the PV array or more than 3 ft, from the point of entry of the building. B. Within the array boundary and more than 3.ft from the point of entry of the building. C. More than 1 ft, from the VP array and more than 5 ft. In length the building. D. More than 10ft, from the PV array or more than 5 ft. in length inside the building

Correct Answer: A

NABCEP PV Installation Professional (PVIP) Board Certification - PVIP Exam Questions