NABCEP Board PVIP Dumps | Updated Mar 24, 2022 - DumpsTests
Master 2022 Latest The Questions NABCEP Board and Pass PVIP Real Exam!
NEW QUESTION 18
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. Supplement 1/4 in, in thick aluminumplate electrode buried 30 in. down and located 7 ft, away.
- B. Buried water piping system using 40 ft. of 2 in. PVC piping located 10 ft awat.
- C. Supplemental grounding electrode located 5 ft, away.
- D. Supplemental copper plated steel grounding electrode located 8 ft, away.
Answer: D
NEW QUESTION 19
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. 7, 689W
- B. 9, 600W
- C. 21, 600W
- D. 17, 280W
Answer: D
NEW QUESTION 20
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 21
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. Threaded coupling
- B. Grounding bushing
- C. Insulated bushing
- D. Sealing locknut
Answer: B
NEW QUESTION 22
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 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.
- B. 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.
- C. 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.
- D. 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.
Answer: C
NEW QUESTION 23
Most electric service providers require interactive PV equipment to comply with which for interconnection to their distribution grid?
- A. UL 16998
- B. UL 1741
- C. UL 2703
- D. UL 60947-1
Answer: D
NEW QUESTION 24
Which of the following is an NEC requirement regarding access for large-scale PV electric power production facilities?
- A. All fencing and associated gates must have ac and dc current and voltage exposure labvels and must be electrically isolated from the solar facility.
- B. 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.
- C. Field-applied hazard markings must be installed, and access to the supply station is to be restricted by fencing or other adequate means.
- D. Access to remote isolating equipment for servicing is allowed for individual other than qualified persons when the equipment is enclosed within a secure structure.
Answer: C
NEW QUESTION 25
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 26
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: D
NEW QUESTION 27
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 28
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 29
How should stratification be eliminated in a set of large, stationary, stationary flooded lead-acid batteries?
- A. Add 50% diluted sulfuric acid.
- B. Discharge to 80 depth of discharge.
- C. Enable equalization.
- D. Rotate the battery positions
Answer: C
NEW QUESTION 30
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 31
An installer is hired to troubleshoot a 10-year-old roottop system with open-circuitvoltage 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. Cracked insulation has allowed water intrusion that resulted in oxidation of the copper conductors.
- B. Insulation has become an electrical conductor since it has changed its composition.
- 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.
Answer: B
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
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 34
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 35
Which of the following should a PV installer do during dc insulation resistance testing?
- A. Remove surge suppression equipment from the circuit being tested.
- B. Wait until is raining and all wiring is damp to conduct the test.
- C. Connect the megohmmeters's negative terminal to the dc circuit insulation
- D. Close ac and dc disconnects and have the system running for at least 5 minutes before testing.
Answer: C
NEW QUESTION 36
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 37
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. Change the main circuit breaker to a 200A unit.
- C. Replace the 200A panel with a 150A panel.
- D. Complete the installation as noted above.
Answer: D
NEW QUESTION 38
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. Dispatch the technician to the site t investigate the low performance issue in person.
- B. Review power output and weather conditions via the monitoring portal, and review local weather reports.
- C. Call the data acquisition company to report a monitoring system failure.
- 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 39
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 40
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 41
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