Question 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?

Options :

A : #12 aluminum

B : #10 copper

C : #8 copper

D : #6 aluminum

Answer: B

Question 2

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 ancable and connector rated for 30A. What is the MAXIMUM number of inverters that may be wired together on a single 30A feeder circuit?

Options :

A : 15

B : 17

C : 23

D : 28

Answer: C

Question 3

A residential PV system uses two 120.240Vac utility-interactive inverters with a sealed lead-acid battery energy backup for protected loads. The MOST important protected load consideration when operating in the backup mode is that:

Options :

A : The protected loads must have automatic restart function.

B : All protected loads are connected in multiwire branch circuits.

C : The peak current from the sealed lead- acid batteries must not exceed peak demand currents.

D : The stand-alone system configuration can adequately supply current to all protected load branch circuit.

Answer: B

Question 4

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

Options :

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 : Rapid shutdown requirements within 1 ft of the array boundary.

C :

Polycrystalline modulesare more shade-tolerance than eitheramorphous or monocrystalline modules and allow a larger array to be installed, including in area where shading could be seasonally problematic.

D :

Microinverters can be installed with either polycrystalline or monocrystalline modules, negating the need for rapid shutdown compliance.

Answer: D

Question 5

A customer has a 200A service with a 200A rated panel and 200A main breaker located on the street side of the house. There is a 100A breaker located at the opposite end of busbar feeding a 125A subpanel in the backyard. The customer would like to place the inverter the backyard and use the 125 subpanel. Which MAXIMUM inverter(s) output circuit current could be installed?

Options :

A : 30A

B : 32A

C : 40A

D : 42A

Answer: C

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