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

1. The following dc portion of a PV schematic (functionally grounded conductor not shown) is submitted to the building official for permit approval. The building official, who also is he AHJ, allow the system to be installed by requiring what NEC-required MINIMUM size equipment grounding conductor at Location A?

A) #6 aluminum
B) #8 copper
C) #10 copper
D) #12 aluminum

2. A site survey indicates a residential roof with a 4:12 pitch facing 20° east of south. The local latitude is 35°N, and the optimal tilt for maximum annual production is equal to latitude. What adjustment should be made to compensate for the roof's orientation and tilt to achieve near-optimal output?

A) Install adjustable racking to match 35° tilt
B) No adjustment needed; output loss is negligible
C) Increase array capacity by 5%
D) Rotate modules 20° west to face true south

3. An installer was asked to provide a means to measure the voltage of each battery in a system. The bank is located 50 ft.
From the data logger. The installer will be using shielded. Twisted pairs of instrumentation wiring, all run in the bundle a conduct.
The signals are connected to isolated and ungrounded inputs at a data logger. Which safely precaution is MOST needed to protect the instrumentation wiring?

A) Individual nonfused disconnects are required for each set of wiring because all of the signals must be isolated from each other.
B) The instrument wiring must be large (larger than # 18 AWG) to handle current from each battery and must be a double- insulated type.
C) An appropriately rated and sized of resistive elements for each twisted pair be located at, or very near to, the data logger terminals
D) Each set of twisted pairs must be provided with properly rated fuses that are physically located at the battery.

4. A 12 kW array has a measured output of 10 kW at STC due to mismatch losses. What is the mismatch loss percentage?

A) 10%
B) 15%
C) 12%
D) 16.7%

5. A PV system is located at 41 N latitude. The sun angle is 23 on December 21 at solar noon. Assuming that the
65 ft tree is directly south of the PV array and will grow 20 ft. over the life of the PV system, what is the MNIMUM distance the tree to the button of the prevent shading?

A) 201 ft.
B) 98 ft.
C) 167 ft.
D) 153 ft.

Solutions: