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NEW QUESTION 15
The NEC requires that PV systems installed on dwellings incorporate which of the following components?
- A. Dc lightning surge arrestors
- B. A dc ground-fault protect device
- C. A lockable utility disconnect at the point-of-utility interconnection
- D. Blocking diodes across each module
Answer: C
NEW QUESTION 16
The AHJ for enforcement of the NEC has which responsibility?
- A. Making interpretations of the rules and deciding on approval of equipment and material
- B. Inspecting factory-installed wire and equipment construction methods
- C. Approval equipment installation methods for efficiency, convenience, and adequacy for good service
- D. Inspecting installations under the exclusive control of the electric utility
Answer: A
NEW QUESTION 17
Which of the following tests measures axial uplift whenperforming load testing of driven-pile foundation members
- A. Resistance to horizontal movement
- B. Resistance to downward (Sinking force
- C. Resistance to twisting
- D. Resistance to withdraw (pull-out) force
Answer: D
NEW QUESTION 18
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 an intermittent inverter failure that is causing production to be lower than expected and the inverter should be repaired.
- B. The system has experienced above-average degradation and a module warranty claim should be explored.
- 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. A combination of normal module degradation combined with cloudy weather has caused lower output in the past few years.
Answer: D
NEW QUESTION 19
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. Insulated bushing
- D. Threaded coupling
Answer: B
NEW QUESTION 20
Thermal imaging infrared cameras can be used to help find which of the following system operational issues?
- A. Battery state of charge in a multimode system
- B. Intensity of solar insolation to determine power output
- C. Blind spot fault in a source circuit
- D. Loose PV input circuit terminations in a combiner box
Answer: C
NEW QUESTION 21
When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of
3000Vdc which procedures should be followed to establish an electrically safe condition?
- A. Apply lockout/tagout devices and install a listed isolation transformer.
- B. Determine possible sources electrical supply an avoid exposure to energized conductors or parts.
- C. Verify that disconnecting device blades are closed and test conductors using an adequately rated detector.
- D. Mount inverters on nonconductive supports and temporarily ground one dc circuit conductor.
Answer: B
NEW QUESTION 22
A7KW/ 14 KWh multimode systemhas 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 toad exceeds the capacity of the interconnection breaker.
- B. The main service panel is no longer compliant with NCC 705.12.
- 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.
Answer: A
NEW QUESTION 23
A PV system equipped with rapid shutdown requires a label stating ''RAPID SHUTDOWN SWITCH FOR SOLAR PV SYSTEM''.
Which is the BEST description of where this label is required?
- A. On or within 3 ft. of the ac disconnect
- B. On or within 3 ft. of the ac disconnect
- C. On or within 3 ft. of the ac disconnect
- D. On or within 3 ft. of the ac disconnect
Answer: C
NEW QUESTION 24
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 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.
- 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 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: A
NEW QUESTION 25
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?
- A. #8 copper
- B. #12 aluminum
- C. #6 aluminum
- D. #10 copper
Answer: D
NEW QUESTION 26
According to the NEC, where on a residential PV system MUST the labeling describing the type of rapid shutdown be located?
- A. At point on the residence designated by the AKJ and fire marshal
- B. On or no more than 1 m (3. 3 ft) from the service disconnecting meant
- C. A close as practicable to the PV array requiring rapid shutdown
- D. On the rapid shutdown initiation device.
Answer: D
NEW QUESTION 27
Which of the following is an NEC requirement regarding access for large-scale PV electric power production facilities?
- A. Access to remote isolating equipment for servicing is allowed for individual other than qualified persons when the equipment is enclosed within a secure structure.
- B. All fencing and associated gates must have ac and dc current and voltage exposure labvels and must be electrically isolated from the solar facility.
- C. Arc flash warning labels must be field-applied by the installer at all access points for qualified persons and at the point of the utility interconnection directory.
- D. Field-applied hazard markings must be installed, and access to the supply station is to be restricted by fencing or other adequate means.
Answer: D
NEW QUESTION 28
Which of the following requires a UL listing or its equivalent?
- A. Lag screws
- B. System manuals
- C. Grounding electrode clamp
- D. System labels and markings
Answer: C
NEW QUESTION 29
A grounding electrode is required at the location of all ground-mounted and pole-mounted PV arrays. Which typeof grounding electrode is NOT permitted for arrays. Which type of the grounding electrode is NOT permitted for array grounding?
- A. Aluminum structural member in direct contact with the earth for 10ft, or more
- B. Concrete-encased 4 AWG copper conductor at least 20 ft, in length
- C. Metal frame of a building or structure in direct with the earth for 10 ft. or more.
- D. Metal underground water pipe in direct contact with the earth for 10 ft. or more.
Answer: A
NEW QUESTION 30
Most electric service providers require interactive PV equipment to comply with which for interconnection to their distribution grid?
- A. UL 16998
- B. UL 60947-1
- C. UL 2703
- D. UL 1741
Answer: B
NEW QUESTION 31
In the middle of a winter day, the data acquisition system for a ground-mounted PV system with large central inverters sends an email alert that system performance is at 50% based on irradiance and temperature performance calculations. No inverters are completely offline. The closed technician is a 4-hour drive from the site, and there are no cameras on site. Which is the BEST response to this situation?
- A. Call the data acquisition company to report a monitoring system failure.
- B. Review power output and weather conditions via the monitoring portal, and review local weather reports.
- C. Dispatch the technician to the site t investigate the low performance issue in person.
- D. Report the low performance to theinverter manufacturer and request that a technical be sent to the site for a warranty claim.
Answer: B
NEW QUESTION 32
Which of the following voltages should be included on the dc disconnected label to indicate MAXIMUM system voltage?
- A. Source circuit V
- B. Non-temperature-corrected V
- C. 600 V
- D. Temperature-corrected V
Answer: D
NEW QUESTION 33
Which electrical connection requires the use of a torque device to complete the connection per NEC requirements?
- A. Crimp-on log to the battery cable
- B. Screw terminals on an ac receptacle outlet
- C. Underground direct-burial twist-on wire connector
- D. Soldered splices in a conduit body
Answer: A
NEW QUESTION 34
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. 6 AWG
- B. 4 AWG
- C. 10 AWG
- D. 8 AWG
Answer: B
NEW QUESTION 35
Which of the following is an NEC-indicate means to identify PV source and output circuits at accessible points of termination connection, and splices?
- A. Conduct stickers
- B. Insulation type
- C. Tagging
- D. Placards
Answer: C
NEW QUESTION 36
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. Within the array boundary and more than 3.ft from the point of entry of the building.
- C. More than 1 ft, from the PV array or more than 3 ft, from the point of entry of the building.
- D. More than 1 ft, from the VP array and more than 5 ft. In length the building.
Answer: C
NEW QUESTION 37
Which circuits are on the utility side of a service point?
- A. Feeders
- B. Service entrance conductors
- C. Service conductors
- D. Service lateral
Answer: C
NEW QUESTION 38
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. Array racking touching the EGC at multiple points
- B. Bypass dlode failures inducing current on the EGC
- C. A break in the EGC, leaving the array ungrounded
- D. Nyton wire ties in contact with the copper wire
Answer: A
NEW QUESTION 39
A ground resistance measurement on a newly installed grounding electrode indicates a resistance of 130. The earth connection may be improved by connecting the existing electrode to a:
- A. Buried water piping system using 40 ft. of 2 in. PVC piping located 10 ft awat.
- B. Supplemental grounding electrode located 5 ft, away.
- C. Supplement 1/4 in, in thick aluminumplate electrode buried 30 in. down and located 7 ft, away.
- D. Supplemental copper plated steel grounding electrode located 8 ft, away.
Answer: D
NEW QUESTION 40
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