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

1. A tap conduct is to be connected to a feeder supplied by both a utility service source and a utility-interactive inverter source. The feeder utility source is a 400A breaker in a service panel, the inverter overcurrent protection device is rated at 100A, and the inverter continuous output current is 72. The tap conductor that is to be installed will be 17 ft. long. It will be located in a raceway and will supply a subpanel with a 50A main breaker.
What is the MINIMUM required ampacity of the tap conductor?

A) 50A
B) 163
C) 400A
D) 72

2. A module's power drops by 0.5%/year. After 10 years, what is the output if the original power is 320W?

A) 304W
B) 288W
C) 310W
D) 316W

3. An 8KWsc roof-mounted array is placed on a school building. The inverter is located within 1 ft, of the array boundary and has an integrated ac-and dc-disconnecting switch. The system is to be connected to a 400A load center, protected by a 400A main breaker. Which of the following MUST be included to meet NEC requirements?

A) A readily accessible dc disconnect with rapid shutdown initiation device permanently labeled
B) A readily accessible ac-disconnecting switch, who location is identified on the system directory
C) An ac-disconnect label with the location of the rooftop dc-disconnect switch.
D) A rapid shutdown initiation device operating contractor within 1 ft, of the array to de-energize the dc subarrays

4. A 10 kW PV array uses 300W modules with a Voc of 40V and an Isc of 9A. The inverter has a maximum DC input of 600V and 25A. What is the maximum number of modules that can be connected in a single string?

A) 15
B) 14
C) 16
D) 12

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

Solutions: