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

1. A PV system uses 10 AWG USE-2 wire for a 150-foot source circuit run with an Isc of 8A. The terminals are rated at 75°C. What is the ampacity of the conductor after applying NEC temperature and conduit fill adjustments at 35°C?

A) 45A
B) 40A
C) 35A
D) 30A

2. The point-of-utility connection of a residential utility-interactive PV system is in the main distribution panel.
If the busbars of the main distribution panel are rated at 200A, and if the distribution panel has a 200A main breaker, the rated output current of the inverter cannot exceed.

A) 24A
B) 40A
C) 200A
D) 32A

3. A system's specific yield is 1500 kWh/kW. If the array is 8 kW, what is the annual output?

A) 14,000 kWh
B) 16,000 kWh
C) 12,000 kWh
D) 10,000 kWh

4. A ground-mount PV system is planned for a site with a soil bearing capacity of 2000 psf. The array footing design requires a minimum bearing pressure of 1500 psf. What is the safety factor for this installation?

A) 0.75
B) 1.5
C) 2.0
D) 1.33

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

Solutions: