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

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) 240V
D) 80V

2. During a site assessment, an installer identifies a 100-foot-tall tree 150 feet south of a proposed PVarray. The site latitude is 40°N. Will this tree cause shading on December 21st between 9 AM and 3 PM solar time?

A) Yes, shading will occur all day
B) Yes, shading will occur before 10 AM only
C) Insufficient data to determine
D) No, shading will not occur

3. While surveying a potential three-phase project, an installer measures the voltage at the point of utility interconnection. The results are as follows:
* Phase to phase: 240V
* Phase A neutral: 120V
* Phase B neutral: 208V
* Phase C neutral: 120V
Which is a likely cause of these reading?

A) Supply-side ground fault
B) High-leg transformer configuration
C) Phase-to-phase power imbalances
D) Missing ground in the transformer

4. 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

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

Solutions: