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

1. 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) 34A
B) 42A
C) 61A
D) 54A

2. A homeowner is weighing the PV module options for a roof-mounted solar array. Which is a correct option to present to the homeowner?

A) Building-integrated PV shingles will be flush or nearly flush with other shingles, but the electrical energy produced will be less than polycrystalline or monocrystalline modules.
B) Polycrystalline modules are more shade-tolerance than either amorphous or monocrystalline modules and allow a larger array to be installed, including in area where shading could be seasonally problematic.
C) Microinverters can be installed with either polycrystalline or monocrystalline modules, negating the need for rapid shutdown compliance.
D) Rapid shutdown requirements within 1 ft of the array boundary.

3. Which of the following requires a UL listing or its equivalent?

A) System manuals
B) Grounding electrode clamp
C) System labels and markings
D) Lag screws

4. 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) Each set of twisted pairs must be provided with properly rated fuses that are physically located at the battery.
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) Individual nonfused disconnects are required for each set of wiring because all of the signals must be isolated from each other.

5. A racking system is designed for a wind speed of 120 mph. The site's design wind speed increases to 130 mph. What is the percentage increase in wind pressure?

A) 10%
B) 17%
C) 25%
D) 33%

Solutions: