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

1. A PV system's inverter displays a ground-fault error. What is the first troubleshooting step?

A) Replace the inverter
B) Verify DC disconnect operation
C) Inspect AC wiring
D) Check array insulation resistance

2. A ground-mounted PV system operating with an open-critical voltage of 550V is in a public park. Which installation procedure will meet NEC requirements for protecting the public from potential electric shock?

A) Ground the PV module frames, but not the mounting racks, to local grounding electrodes.
B) Install a physical barrier on the back of the PV modules that prevent that prevents the conductors from being touched.
C) Install PV modules with plastic, insulating the frames, and connect to a grounding electrode at the array.
D) Mount the PV modules on a one-axis (north-south) tracker, with supporting structures listed to UL 2703.

3. A 7KW/ 14 KWh multimode system has been installed at a residence, ac-couple with the customer's existing
6.7kwh ac PV system. The system providers uninterrupted power to a protect loads subpanel, which is connected to a refrigerator, Microwave, 1.0 ton are conditioner, three lightning circuit, and the 6.7kwac PV system. One month later, the homeowner moves additional circuits to the protected loads subpanel, substantially increasing the loads. Why would this cause, the backfed interconnection breaker in the main service panel to trip?

A) The main service panel is no longer compliant with NCC 705.12.
B) The toad exceeds the capacity of the interconnection breaker.
C) The load «the protected loads subpanel exceeds the PV system ac rating by 25%.
D) The total load exceeds the system's energy storage capacity of 14kWh.

4. An installer is using ½ in lag boits to secure roof-monitoring hardware to rafters through a roof deck. Which of the following should the installer predrill?

A) A pilot hole one-half the length of the bolt
B) A 1/8 in, pilot hole through the roof into the rafter
C) A pilot hole one-fourth the length of the bolt
D) A 5/16 in pilot hole through the roof into the rafter

5. A PV system installation utilizes micro inverters connected to each module of the array. Each micro inverter has a nominal rated output of 250WV. Single phase. The microinverters are listed so that multiple inverters may be connected in parallel to a single feeder circuit, and each inverter has an cable and connector rated for
30A. What is the MAXIMUM number of inverters that may be wired together on a single 30A feeder circuit?

A) 28
B) 15
C) 23
D) 17

Solutions: