[Sep 05, 2021] PVIP Ultimate Study Guide - Exam4Labs
Ultimate Guide to Prepare PVIP Certification Exam for NABCEP Board in 2021
NEW QUESTION 19
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. Temperature-corrected V
- D. 600 V
Answer: C
NEW QUESTION 20
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 the rapid shutdown initiation device.
- C. At point on the residence designated by the AKJ and fire marshal
- D. On or no more than 1 m (3. 3 ft) from the service disconnecting meant
Answer: B
NEW QUESTION 21
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. Positive and negative output conductors of string #3 are faulted together.
- B. String #3 has an open connection and is not contributing any voltage.
- C. There is lower module mismatch in string #3 than in string #1 and #2.
- D. A ground fault is causing the current from strings #1 and #2 to flow into string #3.
Answer: A
NEW QUESTION 22
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. 18 in.
- B. 36 in.
- C. 12 in.
- D. 24 in.
Answer: D
NEW QUESTION 23
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. Supplemental grounding electrode located 5 ft, away.
- B. Supplemental copper plated steel grounding electrode located 8 ft, away.
- C. Supplement 1/4 in, in thick aluminumplate electrode buried 30 in. down and located 7 ft, away.
- D. Buried water piping system using 40 ft. of 2 in. PVC piping located 10 ft awat.
Answer: B
NEW QUESTION 24
Which of the following is the required MINIMUM width of the working space In front of ac disconnect equipment?
- A. 30 in. from all exposed live parts and terminals
- B. 36 in. from the right and left edges of the inverter
- C. 36 in. from the top of the ungrounded inverter terminals
- D. 30 in. or the width of the ac disconnect, whichever is greater
Answer: D
NEW QUESTION 25
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. 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.
- 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. 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: B
NEW QUESTION 26
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. 21, 600W
- B. 7, 689W
- C. 17, 280W
- D. 9, 600W
Answer: C
NEW QUESTION 27
An 8KWsc roof-mounted array is placed on a school building. The inverter is located within 1 ft, of the array boundary and has an integrated ac-and dc-disconnecting switch. The system is to be connected to a 400A load center, protected by a 400A main breaker. Which of the following MUST be included to meet NEC requirements?
- A. An ac-disconnect label with the location of the rooftop dc-disconnect switch.
- B. A readily accessible dc disconnect with rapid shutdown initiation device permanently labeled
- C. A readily accessible ac-disconnecting switch, who location is identified on the system directory
- D. A rapid shutdown initiationdevice operating contractor within 1 ft, of the array to de-energize the dc subarrays
Answer: C
NEW QUESTION 28
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. 10 AWG
- B. 6 AWG
- C. 4 AWG
- D. 8 AWG
Answer: C
NEW QUESTION 29
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. 50A
- B. 0
- C. 400A
- D. 1
Answer: D
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, install source circuit fuses, and measure open-circuit voltage.
- B. Install source circuit fuses, verify that all equipment-grounding conductors are secure, and measure ac line voltage.
- C. Perform visual inspection, install source circuit fuses, and measure open-circuit current.
- D. Perform visual inspection, check polarity and measure open-circuit voltage.
Answer: D
NEW QUESTION 31
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. There is an intermittent inverter failure that is causing production to be lower than expected and the inverter 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 32
An installer is using 1/2 in lag boits to secure roof-monitoring hardware to rafters through a roof deck. Which of the following should the installer predrill?
- A. A pilot hole one-half the length of the bolt
- B. A 5/16 in pilot hole through the roof into the rafter
- C. A 1/8 in, pilot hole through the roof into the rafter
- D. A pilot hole one-fourth the length of the bolt
Answer: B
NEW QUESTION 33
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. The instrument wiring must be large (larger than # 18 AWG) to handle current from each battery and must be a double- insulated type.
- 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. Individual nonfused disconnects are required for each set of wiringbecause all of the signals must be isolated from each other.
- D. Each set of twisted pairs must be provided with properly rated fuses that are physically located at the battery.
Answer: D
NEW QUESTION 34
According to the NEC, if the PV system disconnect and the building service disconnect are at different locations, there MUST be a/an:
- A. Means of locking out both disconnects when the PV system inverter is being serviced.
- B. Permanent plaque or directory that indicates the location of thePV utility connection.
- C. Interface that shuts down the PV system if the utility connection is lost.
- D. Permanent plaque or directory that indicates the locations of both disconnects.
Answer: D
NEW QUESTION 35
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. 10 ft
- C. 20 ft
- D. 14 ft
Answer: B
NEW QUESTION 36
An installer troubleshooting a ground-mounted array finds It to be performing as expected most of the time, but a ground-fault error is indicated on hot days. The inverter is in a shaded location. Which of the following should theinstaller check for FIRST when troubleshooting this array?
- A. Pinched module wiring
- B. Intermittent ground connections
- C. High voltage
- D. Loose module connections
Answer: A
NEW QUESTION 37
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. Loose PV input circuit terminations in a combiner box
- D. Intensity of solar insolation to determine power output
Answer: A
NEW QUESTION 38
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. Placards
- B. Conduct stickers
- C. Insulation type
- D. Tagging
Answer: D
NEW QUESTION 39
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. Complete the installation as noted above.
- B. Replace the 200A panel with a 150A panel.
- C. Install a 30A backfed circuit breaker.
- D. Change the main circuit breaker to a 200A unit.
Answer: A
NEW QUESTION 40
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. Dispatch the technician to the site t investigate the low performance issue in person.
- C. Report the low performance to theinverter manufacturer and request that a technical be sent to the site for a warranty claim.
- D. Review power output and weather conditions via the monitoring portal, and review local weather reports.
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. Open all fuse holders in the combiner box.
- C. Remove any surge suppression devices from the circuits.
- D. Test for current on each source circuit coming into the combiner box.
Answer: B
NEW QUESTION 42
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. 201 ft.
- D. 167 ft.
Answer: C
NEW QUESTION 43
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