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NABCEP PV Installation Professional (PVIP) Board Certification Sample Questions:
1. Insulation resistance testing is being performed on the conductors of a 3-year-old PV system. With a constant high test voltage being applied to a dc conductor, the test results in a high resistance reading. Which does this finding indicate?
A) Soling of modules has reduced the efficiency of the system.
B) The conductor insulation is functioning as intended.
C) Typical module degradation has lowered the output of the system's strings.
D) Wiring insulation has degraded and is resulting in leakage.
2. A module's STC power is 300W, with a temperature coefficient of -0.40%/°C. At 65°C, what is the power loss percentage?
A) 18%
B) 14%
C) 12%
D) 16%
3. Which of the following requires a UL listing or its equivalent?
A) Grounding electrode clamp
B) System manuals
C) Lag screws
D) System labels and markings
4. A PV system interconnects at a 480V three-phase service. The inverter output current is 20A per phase. What is the minimum size of the equipment grounding conductor (EGC) per NEC 250.122 if the OCPD is 30A?
A) 10 AWG
B) 14 AWG
C) 12 AWG
D) 8 AWG
5. A PV output circuit requires a disconnecting means per NEC 690.13. Where must it be located?
A) At the point of interconnection
B) At the main service panel
C) Within sight of the inverter
D) Within 10 feet of the array
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: D | Question # 3 Answer: A | Question # 4 Answer: A | Question # 5 Answer: C |
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