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NEW QUESTION 31
A PV array with 58 in. X 38 in modules in portrait orientation is to be mounted at a 35 tiit angle on a shingle roof that has a 5:12 pitch. Assuming the support leg is attached to the top of the modules and is perpendicular to its face, what is the length of the support leg for the modules?
- A. 12.73 in.
- B. 24.24 in.
- C. 40.50 in.
- D. 18.25 in.
Answer: A
NEW QUESTION 32
Which of the following tests measures axial uplift whenperforming load testing of driven-pile foundation members
- A. Resistance to twisting
- B. Resistance to horizontal movement
- C. Resistance to downward (Sinking force
- D. Resistance to withdraw (pull-out) force
Answer: D
NEW QUESTION 33
A PV technician is installing a 6.5KWac inverter using a 40A backfed breaker. The single line shows a 200A panelboard with a 200A breaker, but the installer finds that the panelbord actually has a 150A main breaker.
Which of the following is the CORRECT installation option?
- A. Install a 30A backfed circuit breaker.
- B. Complete the installation as noted above.
- C. Replace the 200A panel with a 150A panel.
- D. Change the main circuit breaker to a 200A unit.
Answer: B
NEW QUESTION 34
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. Array racking touching the EGC at multiple points
- D. Bypass dlode failures inducing current on the EGC
Answer: C
NEW QUESTION 35
Which insulation color is allowed for a current-carrying roottop dc conductor on a functionally grounded 6kw PV system?
- A. Green
- B. Red
- C. Green/yellow
- D. White
Answer: B
NEW QUESTION 36
Which of the following requires a UL listing or its equivalent?
- A. Lag screws
- B. System labels and markings
- C. Grounding electrode clamp
- D. System manuals
Answer: C
NEW QUESTION 37
When doinginitial inspections on a PV system that was installed using racking that is not compliant with UL.2703, an inspector should pay special attention to which electrical attribute?
- A. Racking needs to be bonded to a supplemental grounding electrode conductor.
- B. The grounding conductor must be bonded directly to the primary grounding electrode.
- C. The equipment grounding conductor must be irreversibly spliced.
- D. Each PV module needs to be bonded to the equipment grounding conductor.
Answer: D
NEW QUESTION 38
A homeowner is weighing the PV module options for a roof-mounted solar array. Which is a correct option to present to the homeowner?
- A. Microinverters can be installed with either polycrystalline or monocrystalline modules, negating the need for rapid shutdown compliance.
- B. 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.
- C. Rapid shutdown requirements within 1 ft of the array boundary.
- D. 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.
Answer: A
NEW QUESTION 39
A PV system is located at 41 N latitude. The sun angle is 23 on December 21 at solar noon. Assuming that the
65 ft tree is directly south of the PV array and will grow 20 ft. over the life of the PV system, what is the MNIMUM distance the tree to the button of the prevent shading?
- A. 98 ft.
- B. 153 ft.
- C. 167 ft.
- D. 201 ft.
Answer: D
NEW QUESTION 40
An installer has decided to use 31 in. long. 3.1/2 in diameter conical ground screws as the footings for a
3.840W solar electric system. Access to he is too difficult to pour concrete footings. The soll is classified as sandy loam. The design wind speed is 90 mph with an uplift force of 32 ibs/ft2. What is the MINIMUM number of screw required to resist uplift loads?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 41
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. 36 in.
- B. 18 in.
- C. 24 in.
- D. 12 in.
Answer: C
NEW QUESTION 42
The AHJ for enforcement of the NEC has which responsibility?
- A. Inspecting factory-installed wire and equipment construction methods
- B. Approval equipment installation methods for efficiency, convenience, and adequacy for good service
- C. Making interpretations of the rules and deciding on approval of equipment and material
- D. Inspecting installations under the exclusive control of the electric utility
Answer: C
NEW QUESTION 43
Which electrical connection requires the use of a torque device to complete the connection per NEC requirements?
- A. Underground direct-burial twist-on wire connector
- B. Soldered splices in a conduit body
- C. Screw terminals on an ac receptacle outlet
- D. Crimp-on log to the battery cable
Answer: D
NEW QUESTION 44
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?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 45
What is an arc-flash boundary?
- A. The distance within which qualified personnel can safely perform bare-handed work on exposed energized electrical equipment operating at 50 volts or more.
- B. The approach limit distance from energized electrical equipment within which a person is considered to be exposed to full circuit voltage.
- C. The approach limit distance within which a person could receive a second-degree burn in the event that an electrical arc flash were to occur
- D. The approach limit distance within which inadvertent movement exposes personnel to increase ris due to electrical arc-over potential.
Answer: D
NEW QUESTION 46
A project is using a PV module with a 25-38dc maximum power voltage range and a single input inverter with an operating windows of 250vdc-450dc. The dwelling the system is to be installed on has a 5:12 roof with a southeastem face that can accommodate 14 modules and southwestern face that can accommodate 10 modules.
What is the MAXIMUM number of modules that can be installed for proper inverter maximum power point tracking?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 47
The point-of-utility connection of a residential utility-interactive PV system is in the main distribution panel. If the busbars of the main distribution panel are rated at 200A, and if the distribution panel has a 200A main breaker, the rated output current of the inverter cannot exceed.
- A. 40A
- B. 200A
- C. 32A
- D. 24A
Answer: C
NEW QUESTION 48
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 last to make and first to break contact with the mating connector
- B. The connector shall be installed so as to guard against inadvertent with live parts by persons.
- C. The connector shall have a non-polarized configuration.
- D. The grounding member shall be interconnectchangeable with receptacles in other electrical systems.
Answer: B
NEW QUESTION 49
While surveying a potential three-phase project, an installer measures the voltage at the point of utility interconnection. The results are as follows:
* Phase to phase: 240V
* Phase A neutral: 120V
* Phase B neutral: 208V
* Phase C neutral: 120V
Which is a likely cause of these reading?
- A. Supply-side ground fault
- B. Missing ground in the transformer
- C. Phase-to-phase power imbalances
- D. High-leg transformer configuration
Answer: D
NEW QUESTION 50
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. 8 AWG
- B. 10 AWG
- C. 6 AWG
- D. 4 AWG
Answer: D
NEW QUESTION 51
Insulation resistance testing is being performed on the conductors of a 3-year-old PV system. With a constant high test voltage being applied to a dc conductor, the test results in a high resistance reading. Which does this finding indicate?
- A. Typical module degradation has lowered the output of the system's strings.
- B. Wiring insulation has degraded and is resulting in leakage.
- C. The conductor insulation is functioning as intended.
- D. Soling of modules has reduced the efficiency of the system.
Answer: C
NEW QUESTION 52
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 load the protected loads subpanel exceeds the PV system ac rating by 25%.
- B. The total load exceeds the system's energy storage capacity of 14kWh.
- C. The toad exceeds the capacity of the interconnection breaker.
- D. The main service panel is no longer compliant with NCC 705.12.
Answer: C
NEW QUESTION 53
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