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

1. A bifacial PV module has a rated power of 350W on the front side and a bifaciality factor of 70%. If the rear side receives 200 W/m² of irradiance, what is the total power output under STC front-side conditions (1000 W
/m²)?

A) 490W
B) 449W
C) 385W
D) 420W

2. A 15 kW system has a total derate factor of 0.87. After 3 years at 1% degradation/year, what is the output?

A) 12.6 kW
B) 12.8 kW
C) 13.0 kW
D) 13.2 kW

3. A rooftop PV array has conductors running through a conduit exposed to sunlight on a roof with an ambient temperature of 40°C. The conduit is 2 inches above the roof surface. What is the NEC temperature adjustment factor for 90°C-rated conductors?

A) 0.87
B) 0.96
C) 0.91
D) 1.00

4. A AWG THWN-2 PV output conductors from two PV arrays are run in the same 3 in, conduit to their respective functionally grounded inverters in the building. The three PV source circuits are each protected by a 15A fuse in the combiner box at the array. The conduit, which is strapped directly to the roof, is exposed to design temperatures of 140' F (60' C) during its 30 ft.
Exposed run. What is the MAXIMUM current carrying capability value of the PV output conductors?

A) 42A
B) 61A
C) 54A
D) 34A

5. A metal condult containing an array circuit with Vmo of 400Vdc is connected to a metal enclosure at the location where the concentric knockouts have been punched by the manufacturer. Which method of attachment should be used?

A) Grounding bushing
B) Threaded coupling
C) Sealing locknut
D) Insulated bushing

Solutions: