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NEW QUESTION 21
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. 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. Microinverters can be installed with either polycrystalline or monocrystalline modules, negating the need for rapid shutdown compliance.
- C. Rapid shutdown requirements within 1 ft of the array boundary.
- D. 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.
Answer: B
NEW QUESTION 22
According to the NEC, where on a residential PV system MUST the labeling describing the type of rapid shutdown be located?
- A. A close as practicable to the PV array requiring rapid shutdown
- B. On or no more than 1 m (3. 3 ft) from the service disconnecting meant
- C. At point on the residence designated by the AKJ and fire marshal
- D. On the rapid shutdown initiation device.
Answer: D
NEW QUESTION 23
On a PV system larger than 100kw, which PV array design will provide the HIGHEST degree of performance monitoring.
Granularity, and ease of troubleshooting performance issues?
- A. Multiple-string inverter system with monitored dc-to-dc converters located at each module
- B. Multiple-string inverter system with data acquisition system located at each inverter.
- C. Multiple-string inverter system with data acquisition system located at each dc combiner
- D. Central inverter with data acquisition system located at the inverter.
Answer: C
NEW QUESTION 24
Which of the following requires a UL listing or its equivalent?
- A. Grounding electrode clamp
- B. Lag screws
- C. System manuals
- D. System labels and markings
Answer: A
NEW QUESTION 25
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. 40 modules in landscape
- B. 30 modules in portrait
- C. 28 modules in portrait
- D. 35 modules in landscape
Answer: D
NEW QUESTION 26
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. Each PV module needs to be bonded to the equipment grounding conductor.
- B. The grounding conductor must be bonded directly to the primary grounding electrode.
- C. Racking needs to be bonded to a supplemental grounding electrode conductor.
- D. The equipment grounding conductor must be irreversibly spliced.
Answer: A
NEW QUESTION 27
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. 12 in.
- B. 18 in.
- C. 24 in.
- D. 36 in.
Answer: C
NEW QUESTION 28
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. Inspecting installations under the exclusive control of the electric utility
- D. Making interpretations of the rules and deciding on approval of equipment and material
Answer: D
NEW QUESTION 29
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. The conductor insulation is functioning as intended.
- B. Wiring insulation has degraded and is resulting in leakage.
- C. Soling of modules has reduced the efficiency of the system.
- D. Typical module degradation has lowered the output of the system's strings.
Answer: A
NEW QUESTION 30
When performing a system checkout after completing the installation, what is the SAFEST sequence of tasks to detect installation errors before closing any disconnects to the inverter, charge controller, or batteries?
- A. Perform visual inspection, check polarity and measure open-circuit voltage.
- B. Perform visual inspection, install source circuit fuses, and measure open-circuit voltage.
- C. Perform visual inspection, install source circuit fuses, and measure open-circuit current.
- D. Install source circuit fuses, verify that all equipment-grounding conductors are secure, and measure ac line voltage.
Answer: A
NEW QUESTION 31
Which electrical connection requires the use of a torque device to complete the connection per NEC requirements?
- A. Screw terminals on an ac receptacle outlet
- B. Underground direct-burial twist-on wire connector
- C. Soldered splices in a conduit body
- D. Crimp-on log to the battery cable
Answer: D
NEW QUESTION 32
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. 18.25 in.
- D. 40.50 in.
Answer: A
NEW QUESTION 33
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. 32A
- B. 40A
- C. 24A
- D. 200A
Answer: A
NEW QUESTION 34
A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of theswitchare 440 on string #1, 444V on string
#2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are
3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?
- A. There is lower module mismatch in string #3 than in string #1 and #2.
- B. String #3 has an open connection and is not contributing any voltage.
- C. A ground fault is causing the current from strings #1 and #2 to flow into string #3.
- D. Positive and negative output conductors of string #3 are faulted together.
Answer: D
NEW QUESTION 35
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: D
NEW QUESTION 36
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 withdraw (pull-out) force
- D. Resistance to downward (Sinking force
Answer: C
NEW QUESTION 37
Which is a requirement for designated battery rooms?
- A. Battery cabinets, racks, or trays must have a minimum clearance of 12 in. from any wall.
- B. Gas pipe equipment must be constructed and installed for a Hazardous Class I location.
- C. illumination shall be provided by lightingoutlets controlled by automated means only.
- D. must be equipped withpanic hardware and open m the directionof egress.
Answer: D
NEW QUESTION 38
Which of the following MUST be referenced for determining a site's design wind speed?
- A. The jurisdiction's local building code in effect
- B. The NEC version in effect
- C. The ASHRAE Handbook_fundamentals in effect
- D. The module manufacture's design wind speed
Answer: C
NEW QUESTION 39
When running horizontal 1-1/4 in, electrical metallic tubing (EMT) with compression fittings, what is the MAXIMUM permissible distance between condult supports?
- A. 3 ft
- B. 20 ft
- C. 10 ft
- D. 14 ft
Answer: C
NEW QUESTION 40
A tap conduct is to be connected to a feeder supplied by both a utility service source and a utility-interactive inverter source. The feeder utility source is a 400A breaker in a service panel, the inverter overcurrent protection device is rated at 100A, and the inverter continuous output current is 72. The tap conductor that is to be installed will be 17 ft. long. It will be located in a raceway and will supply a subpanel with a 50A main breaker.
What is the MINIMUM required ampacity of the tap conductor?
- A. 0
- B. 400A
- C. 50A
- D. 1
Answer: D
NEW QUESTION 41
A technician has been called to a scale due to a low-performing array. The technician will perform tests in the
24-source circuit combiner box. After putting on the correct PPE and turning off and performing lock.tagout of the inverted and combiner disconnect. Which is the next step to safely begin electrical testing in the combiner box?
- A. Test for voltage on the positive out
- B. Test for current on each source circuit coming into the combiner box.
- C. Remove any surge suppression devices from the circuits.
- D. Open all fuse holders in the combiner box.
Answer: D
NEW QUESTION 42
Which load path connections need to be analyzed when determining live and dead loads on a PV array system installed directly to a metal seam roof?
- A. Module to rail to metal seam roof, metal seam roof to top plate system
- B. Module to rail, rail to roof sheathing, roof sheathing to wall, wall to base plate/foundation system
- C. Rail to metal seam roof, metal seam roof to top plate, top plate to wall system
- D. Module to rail to metal seam roof, metal seam roof sheathing/rather system.
Answer: D
NEW QUESTION 43
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