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NEW QUESTION 13
Thermal imaging infrared cameras can be used to help find which of the following system operational issues?
- A. Blind spot fault in a source circuit
- B. Battery state of charge in a multimode system
- C. Intensity of solar insolation to determine power output
- D. Loose PV input circuit terminations in a combiner box
Answer: A
NEW QUESTION 14
Which temperature coefficient is used in the calculation to verify energy production of a PV system?
A)
B)
C)
D)
- A. Option
- B. Option
- C. Option
- D. Option
Answer: A
NEW QUESTION 15
A PV system was installed in July 2017 under the 2017 NEC. The system has a string inverter located inside a garage on a wall 10 ft, from the outside wall and 1oft, from the ac load center at the point of utility connection.
The PV system has a PV array on the roof. Which of the following represents the PV rapid shutdown system requirement for the controlled PV system conductors associated with this PV array?
- A. More than 10ft, from the PV array or more than 5 ft. in length inside the building
- B. More than 1 ft, from the VP array and more than 5 ft. In length the building.
- C. Within the array boundary and more than 3.ft from the point of entry of the building.
- D. More than 1 ft, from the PV array or more than 3 ft, from the point of entry of the building.
Answer: D
NEW QUESTION 16
The NEC requires that PV systems installed on dwellings incorporate which of the following components?
- A. A lockable utility disconnect at the point-of-utility interconnection
- B. Blocking diodes across each module
- C. A dc ground-fault protect device
- D. Dc lightning surge arrestors
Answer: A
NEW QUESTION 17
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 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.
- B. Install a 325A breaker at the PV source connection point on the portion of the feeder toward the subpanel. Increase thecapacityof the feeder from the main panel board to 325A breaker to the bottom of the main service panel, away from the 800 main breaker.
- C. 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.
- D. 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.
Answer: B
NEW QUESTION 18
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. 54A
- C. 42A
- D. 61A
Answer: A
NEW QUESTION 19
An 8 AWG bare copper equipment ground conductor (EGC) is wire tied to the module mounting structure of a commercial rooftop solararray. After a few years of operation, some spots on the EGC begin 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
Answer: D
NEW QUESTION 20
A grid-interactive PV system with battery backup is being installed with a ground-mounted PV array located
200 ft, from the inverter and batteries. The dc PV output circuit has overcuit has overcurrent protection rated from 30A. To reduce voltage drop between the array and batteries, the output circuit wire size was determined to be 6 AWG. The fused dc disconnect between the inverted and batteries is rated for 300A. What is the required size of the equipment grounding conductor between the metal battery case and the inverter?
- A. 4 AWG
- B. 10 AWG
- C. 6 AWG
- D. 8 AWG
Answer: A
NEW QUESTION 21
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. There is a problem with the DAS because the peak sun hours do not correlate with production values and the das should be repaired.
- B. The system has experienced above-average degradation and a module warranty claim should be explored.
- C. A combination of normal module degradation combined with cloudy weather has caused lower output in the past few years.
- D. There is an intermittent inverter failure that is causing production to be lower than expected and the inverter should be repaired.
Answer: C
NEW QUESTION 22
A metal condult containing an array circuit with Vmo of 400Vdc is connected to a metal enclosure at the location where the concentric knockouts have been punched by the manufacturer. Which method of attachment should be used?
- A. Sealing locknut
- B. Grounding bushing
- C. Threaded coupling
- D. Insulated bushing
Answer: B
NEW QUESTION 23
A site has a known magnetic declination of 14 west. What should the corrected azimuth reading of the array be in order to be facing true south?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 24
A commercial 600v carport-mounted PV system is installed with rigid running under the parking lot to an inverter pad located at the edge of the parking lot. At what depth below the parkinglot base MUST condult be buried?
- A. 24 in.
- B. 18 in.
- C. 36 in.
- D. 12 in.
Answer: A
NEW QUESTION 25
A dwelling has a 200A main load center with a 150 main breaker. Which of the following is the MOST powerful 240V inverter that can be installed in the house using the existing main panelboard with a backfed breaker?
- A. 17, 280W
- B. 21, 600W
- C. 9, 600W
- D. 7, 689W
Answer: A
NEW QUESTION 26
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. An appropriately rated and sized of resistive elements for each twisted pair be located at, or very near to, the data logger terminals
- C. The instrument wiring must be large (larger than # 18 AWG) to handle current from each battery and must be a double- insulated type.
- D. Individual nonfused disconnects are required for each set of wiringbecause all of the signals must be isolated from each other.
Answer: A
NEW QUESTION 27
Which circuits are on the utility side of a service point?
- A. Service entrance conductors
- B. Feeders
- C. Service lateral
- D. Service conductors
Answer: D
NEW QUESTION 28
A connector not listed to be used in a concealed location and being used as a disconnect for PV equipment shall comply with which of the following?
- A. The grounding member shall be interconnectchangeable with receptacles in other electrical systems.
- B. The grounding member shall be last to make and first to break contact with the mating connector
- C. The connector shall have a non-polarized configuration.
- D. The connector shall be installed so as to guard against inadvertent with live parts by persons.
Answer: D
NEW QUESTION 29
A 1. 100 ft, 2 ranch home with cathedralcallingshas a 14 ft. x 41 ft. 8 in , south-facing , composite shingle roof. An engineer has determined that the home's 2 in, x 6 in. on-center roof rafters are strong enough to gold a solar electric system. The system will have 62.25 in. x 32.50 in. modules with a 1-in gap between modules and a standard twin-rillmounting system number of modules that can fit on the roof on under these conditions?
- A. 35 modules in landscape
- B. 40 modules in landscape
- C. 28 modules in portrait
- D. 30 modules in portrait
Answer: A
NEW QUESTION 30
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