RENEWABLE ENERGY ELECTRICAL
INSPECTOR EXAMINATION WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS,
PLUS EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. A photovoltaic (PV) array is being inspected on a commercial
building. The inspector observes that the array's DC conductors
enter a combiner box, where multiple strings are connected in
parallel. What is the primary electrical reason for connecting PV
strings in parallel?
A. To increase the system voltage while maintaining approximately the
same current
B. To increase the available current while maintaining approximately the
same voltage
C. To eliminate the need for overcurrent protection
D. To convert the DC output directly into three-phase AC
Answer: B. To increase the available current while maintaining
approximately the same voltage
Rationale: When PV strings are connected in parallel, their voltages
remain approximately equal while their currents add together. For
example, if three identical strings each produce 10 A at 400 V, the
parallel combination produces approximately 30 A at 400 V. Series
connections increase voltage, whereas parallel connections increase
current. An inspector should therefore verify that conductors,
1
,connectors, fuses, disconnects, and other equipment are appropriately
rated for the resulting array current.
2. During inspection of a rooftop PV installation, an inspector
discovers that a string contains modules with significantly different
electrical ratings from the other modules in the same series string.
What is the most significant concern?
A. The modules will automatically increase the system frequency
B. The string may experience reduced performance because the
operating current is constrained by the lowest-current module or
condition
C. The inverter will necessarily produce higher AC voltage
D. The modules will automatically compensate for the mismatch without
losses
Answer: B. The string may experience reduced performance
because the operating current is constrained by the lowest-current
module or condition
Rationale: Series-connected PV modules carry essentially the same
current. A module with substantially different current characteristics,
shading, orientation, temperature, or electrical performance can
therefore reduce the output of the entire string. Inspectors should
evaluate module compatibility, string design, shading, orientation, and
manufacturer requirements. Mismatch can reduce energy production
and, under certain conditions, contribute to abnormal operating
conditions.
3. An inspector is evaluating a grid-connected PV inverter. Which
function is most important for preventing the inverter from
2
,continuing to energize a utility circuit after the utility supply has
been disconnected?
A. Maximum power point tracking
B. Anti-islanding protection
C. Temperature compensation
D. Ground-fault monitoring only
Answer: B. Anti-islanding protection
Rationale: Anti-islanding protection is intended to prevent a grid-
connected inverter from continuing to energize an isolated portion of
the utility network when the normal grid supply has been lost.
Unintentional islanding can create dangerous conditions for utility
personnel and can result in voltage and frequency conditions outside
acceptable limits. An inspector should verify that the inverter is an
approved/listed product and that its interconnection and protective
functions comply with the applicable electrical requirements and
utility rules.
4. A PV system is installed on a building with a metallic structural
frame. The inspector is reviewing the equipment grounding
arrangement. What is the principal purpose of equipment
grounding and bonding in this installation?
A. To increase PV module efficiency
B. To provide a low-impedance path for fault current and help facilitate
operation of protective devices
C. To increase the open-circuit voltage of the array
D. To prevent all lightning strikes
Answer: B. To provide a low-impedance path for fault current and
help facilitate operation of protective devices
3
, Rationale: Equipment grounding and bonding provide a conductive
path for fault current so that exposed conductive parts can be
maintained at safer potentials and overcurrent or other protective
devices can operate when required. Bonding also establishes electrical
continuity among applicable metallic components. Grounding should
not be confused with lightning protection, although properly designed
grounding and bonding can form part of a broader protection strategy.
5. A solar PV array has a maximum open-circuit voltage of 480 V
under reference conditions. The inspector is told that the array will
be installed in a location where very low temperatures can occur.
Why must temperature-corrected maximum voltage be considered?
A. PV voltage always decreases dramatically at low temperatures
B. PV module voltage generally increases as cell temperature decreases,
potentially increasing the maximum circuit voltage
C. Low temperature eliminates inverter overvoltage protection
D. Low temperature affects only AC frequency
Answer: B. PV module voltage generally increases as cell
temperature decreases, potentially increasing the maximum circuit
voltage
Rationale: PV modules typically produce higher voltage at lower cell
temperatures. Therefore, an array that appears acceptable using
nominal or standard-test-condition voltage can exceed the voltage
rating of modules, wiring, disconnects, inverters, or other equipment
during cold-weather operation. An inspector should verify that the
maximum calculated system voltage is within the ratings of all
equipment exposed to that voltage.
4
INSPECTOR EXAMINATION WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS,
PLUS EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. A photovoltaic (PV) array is being inspected on a commercial
building. The inspector observes that the array's DC conductors
enter a combiner box, where multiple strings are connected in
parallel. What is the primary electrical reason for connecting PV
strings in parallel?
A. To increase the system voltage while maintaining approximately the
same current
B. To increase the available current while maintaining approximately the
same voltage
C. To eliminate the need for overcurrent protection
D. To convert the DC output directly into three-phase AC
Answer: B. To increase the available current while maintaining
approximately the same voltage
Rationale: When PV strings are connected in parallel, their voltages
remain approximately equal while their currents add together. For
example, if three identical strings each produce 10 A at 400 V, the
parallel combination produces approximately 30 A at 400 V. Series
connections increase voltage, whereas parallel connections increase
current. An inspector should therefore verify that conductors,
1
,connectors, fuses, disconnects, and other equipment are appropriately
rated for the resulting array current.
2. During inspection of a rooftop PV installation, an inspector
discovers that a string contains modules with significantly different
electrical ratings from the other modules in the same series string.
What is the most significant concern?
A. The modules will automatically increase the system frequency
B. The string may experience reduced performance because the
operating current is constrained by the lowest-current module or
condition
C. The inverter will necessarily produce higher AC voltage
D. The modules will automatically compensate for the mismatch without
losses
Answer: B. The string may experience reduced performance
because the operating current is constrained by the lowest-current
module or condition
Rationale: Series-connected PV modules carry essentially the same
current. A module with substantially different current characteristics,
shading, orientation, temperature, or electrical performance can
therefore reduce the output of the entire string. Inspectors should
evaluate module compatibility, string design, shading, orientation, and
manufacturer requirements. Mismatch can reduce energy production
and, under certain conditions, contribute to abnormal operating
conditions.
3. An inspector is evaluating a grid-connected PV inverter. Which
function is most important for preventing the inverter from
2
,continuing to energize a utility circuit after the utility supply has
been disconnected?
A. Maximum power point tracking
B. Anti-islanding protection
C. Temperature compensation
D. Ground-fault monitoring only
Answer: B. Anti-islanding protection
Rationale: Anti-islanding protection is intended to prevent a grid-
connected inverter from continuing to energize an isolated portion of
the utility network when the normal grid supply has been lost.
Unintentional islanding can create dangerous conditions for utility
personnel and can result in voltage and frequency conditions outside
acceptable limits. An inspector should verify that the inverter is an
approved/listed product and that its interconnection and protective
functions comply with the applicable electrical requirements and
utility rules.
4. A PV system is installed on a building with a metallic structural
frame. The inspector is reviewing the equipment grounding
arrangement. What is the principal purpose of equipment
grounding and bonding in this installation?
A. To increase PV module efficiency
B. To provide a low-impedance path for fault current and help facilitate
operation of protective devices
C. To increase the open-circuit voltage of the array
D. To prevent all lightning strikes
Answer: B. To provide a low-impedance path for fault current and
help facilitate operation of protective devices
3
, Rationale: Equipment grounding and bonding provide a conductive
path for fault current so that exposed conductive parts can be
maintained at safer potentials and overcurrent or other protective
devices can operate when required. Bonding also establishes electrical
continuity among applicable metallic components. Grounding should
not be confused with lightning protection, although properly designed
grounding and bonding can form part of a broader protection strategy.
5. A solar PV array has a maximum open-circuit voltage of 480 V
under reference conditions. The inspector is told that the array will
be installed in a location where very low temperatures can occur.
Why must temperature-corrected maximum voltage be considered?
A. PV voltage always decreases dramatically at low temperatures
B. PV module voltage generally increases as cell temperature decreases,
potentially increasing the maximum circuit voltage
C. Low temperature eliminates inverter overvoltage protection
D. Low temperature affects only AC frequency
Answer: B. PV module voltage generally increases as cell
temperature decreases, potentially increasing the maximum circuit
voltage
Rationale: PV modules typically produce higher voltage at lower cell
temperatures. Therefore, an array that appears acceptable using
nominal or standard-test-condition voltage can exceed the voltage
rating of modules, wiring, disconnects, inverters, or other equipment
during cold-weather operation. An inspector should verify that the
maximum calculated system voltage is within the ratings of all
equipment exposed to that voltage.
4
