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A ground-mount array uses driven piles with a lateral load capacity of 500 lbs. The wind load calculation yields a lateral force of 600 lbs per pile. What must be done?

A.

Increase pile depth

B.

Add additional piles

C.

Use a different foundation type

D.

Any of the above

A homeowner is concerned that a 6kWdc PV system might be experiencing a performance issue. The homeowner has noticed what appears to be declining production. The installer analyzes the following data acquisition system (DAS) results for each year since the installation:

Given the data, which is the MOST likely conclusion to draw?

A.

The system has experienced above-average degradation and a module warranty claim should be explored.

B.

A combination of normal module degradation combined with cloudy weather has caused lower output in the past few years.

C.

There is a problem with the DAS because the peak sun hours do not correlate with production values and the das should be repaired.

D.

There is an intermittent inverter failure that is causing production to be lower than expected and the inverter should be repaired.

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.

12

B.

14

C.

15

D.

16

A bifacial array gains 15% additional power from rear-side irradiance. If the front-side output is 10 kW, what is the total output?

A.

11.0 kW

B.

11.5 kW

C.

12.0 kW

D.

12.5 kW

An installer is hired to troubleshoot a 10-year-old roottop system with open-circuit voltage of 300V. The ground-fault detection (GFD) device has tripped. The insulation on the exposed source circuit cables has deterlorated with multiple cracks and has no flexibility. Which concern is the MOST likely safely issue when servicing this array?

A.

Insulation has become an electrical conductor since it has changed its composition.

B.

Cracked insulation has allowed water intrusion that resulted in oxidation of the copper conductors.

C.

Ungrounded conductors are conducing current event the ground-fault device has activated.

D.

Short-circuit current is present at the PV source-circuit terminals of the disconnect device because of electrical leakage.

Per NEC 690.11, what is the maximum allowable DC voltage for a PV system requiring arc-fault circuit protection?

A.

80V

B.

150V

C.

600V

D.

1000V

A PV connection is being made at the center of a 300 ft. long 200 feeder. See the attack diagram. The feeder originates in the upper third of the 800A main service panel (800A main breaker) with a 200A breaker and terminates in a 200A main-lug-only subpanel. The rated output of the PV system inverter is 100A.

Which are the NIMUMUM actions required to achieve an NEC-compliant installation?

A.

Install a 325A breaker at the PV source connection point on the portion of the feeder toward the subpanel. Increase the capacity of the feeder from the main panel board to 325A breaker to the bottom of the main service panel, away from the 800 main breaker.

B.

Install a 325A at the PV source connection point on the portion of the feeder toward the subpanel, increase the capacity of this portion of the feeder to 325A, add a 200A main breaker to the subpanel, and move the 200A breaker to bottom of the main service panel, away from the 800A main breaker.

C.

Install a 200A breaker at the PV source connection point on the portion on the portion of the feeder toward the subpanel and move the 200A breaker to the top of the main service panel, adjust to the 800A main breaker.

D.

Install a 200A breaker at the PV source connection point on the portion of the feeder toward the subpanel, maintain the capacity of the entire feeder, and move the 200A breaker to the bottom of the main service panel, away from the 800A main breaker.

An 8 AWG bare copper equipment ground conductor (EGC) is wire tied to the module mounting structure of a commercial rooftop solar array. After a few years of operation, some spots on the EGCbegin to turn a green color and appear to be corroding more significantly that other places. What would the MOST likely cause of the problem?

A.

Nyton wire ties in contact with the copper wire

B.

A break in the EGC, leaving the array ungrounded

C.

Bypass dlode failures inducing current on the EGC

D.

Array racking touching the EGC at multiple points

Per NEC 690.4, who is qualified to install a PV system?

A.

Anyone with basic electrical knowledge

B.

A licensed electrician or supervised trainee

C.

Only a NABCEP-certified installer

D.

A journeyman with PV experience

A rooftop PV system is proposed for a commercial building with a membrane roof. The structural engineer specifies a maximum allowable dead load of 5 psf. The PV modules weigh 3 psf, and the racking adds 1.5 psf. What additional load can be added without exceeding the limit?

A.

0 psf

B.

0.5 psf

C.

1.0 psf

D.

1.5 psf