CO Solar Electric Contractor Exam
Practice Questions And Correct
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1. A Colorado solar electric contractor is designing a grid-connected
photovoltaic (PV) system for a dwelling. Which code framework
most directly governs the installation of the PV system, including
wiring methods, overcurrent protection, disconnecting means,
grounding, and interconnection requirements?
A. International Plumbing Code only
B. National Electrical Code (NFPA 70) as adopted by the applicable
Colorado authority having jurisdiction
C. International Mechanical Code only
D. International Energy Conservation Code only
B. National Electrical Code (NFPA 70) as adopted by the applicable
Colorado authority having jurisdiction
The NEC provides the primary electrical requirements for photovoltaic
systems, including conductors, overcurrent protection, disconnects,
grounding and bonding, equipment, and interconnection. Other adopted
,codes may apply to structural, fire, energy, and building-related aspects
of the project.
2. A PV array has modules connected in series to increase the system
voltage. If six identical modules each have a maximum-power
voltage of 40 V under the relevant operating condition, what is the
approximate maximum-power voltage of the series string?
A. 6.67 V
B. 40 V
C. 46 V
D. 240 V
D. 240 V
In a series circuit, voltage is additive while current remains
approximately equal to the current of one module. Six modules at 40 V
each produce approximately 240 V at maximum power.
3. What is the principal electrical effect of connecting identical PV
modules in parallel?
A. Voltage increases while current remains unchanged
B. Current increases while voltage remains approximately unchanged
C. Both voltage and current become zero
D. Frequency increases while voltage decreases
B. Current increases while voltage remains approximately unchanged
Parallel-connected identical PV sources maintain approximately the
same voltage as one source while their available currents add. This
,characteristic is used when additional array current is required without
increasing operating voltage.
4. A Colorado solar contractor is calculating the design voltage of a PV
circuit installed outdoors during winter. Why must the lowest
expected ambient temperature be considered when determining
maximum PV system voltage?
A. PV module voltage generally increases as temperature decreases
B. PV module voltage becomes independent of temperature in cold
weather
C. PV module current always becomes zero below freezing
D. Cold temperatures eliminate the need for voltage calculations
A. PV module voltage generally increases as temperature decreases
Crystalline PV modules generally produce higher open-circuit voltage at
lower temperatures. Therefore, the cold-weather voltage of a series
string must be evaluated so that equipment voltage ratings are not
exceeded.
5. Which PV module electrical parameter represents the voltage
measured when the module's external circuit is open and no
current is being delivered?
A. Isc
B. Imp
C. Voc
D. Pmax
, C. Voc
Voc means open-circuit voltage. It is measured when the circuit is open
and current is essentially zero, and it is particularly important when
calculating the maximum possible string voltage under cold conditions.
6. Which parameter represents the short-circuit current of a
photovoltaic module?
A. Voc
B. Isc
C. Vmp
D. Vmax
B. Isc
Isc means short-circuit current. It represents the current available when
the module terminals are shorted under specified test conditions and is
an important value when sizing conductors and overcurrent protection.
7. A PV module has a rated maximum-power voltage of 42 V and a
rated maximum-power current of 12 A. What is its approximate
maximum power?
A. 54 W
B. 252 W
C. 504 W
D. 1,008 W
C. 504 W
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A Colorado solar electric contractor is designing a grid-connected
photovoltaic (PV) system for a dwelling. Which code framework
most directly governs the installation of the PV system, including
wiring methods, overcurrent protection, disconnecting means,
grounding, and interconnection requirements?
A. International Plumbing Code only
B. National Electrical Code (NFPA 70) as adopted by the applicable
Colorado authority having jurisdiction
C. International Mechanical Code only
D. International Energy Conservation Code only
B. National Electrical Code (NFPA 70) as adopted by the applicable
Colorado authority having jurisdiction
The NEC provides the primary electrical requirements for photovoltaic
systems, including conductors, overcurrent protection, disconnects,
grounding and bonding, equipment, and interconnection. Other adopted
,codes may apply to structural, fire, energy, and building-related aspects
of the project.
2. A PV array has modules connected in series to increase the system
voltage. If six identical modules each have a maximum-power
voltage of 40 V under the relevant operating condition, what is the
approximate maximum-power voltage of the series string?
A. 6.67 V
B. 40 V
C. 46 V
D. 240 V
D. 240 V
In a series circuit, voltage is additive while current remains
approximately equal to the current of one module. Six modules at 40 V
each produce approximately 240 V at maximum power.
3. What is the principal electrical effect of connecting identical PV
modules in parallel?
A. Voltage increases while current remains unchanged
B. Current increases while voltage remains approximately unchanged
C. Both voltage and current become zero
D. Frequency increases while voltage decreases
B. Current increases while voltage remains approximately unchanged
Parallel-connected identical PV sources maintain approximately the
same voltage as one source while their available currents add. This
,characteristic is used when additional array current is required without
increasing operating voltage.
4. A Colorado solar contractor is calculating the design voltage of a PV
circuit installed outdoors during winter. Why must the lowest
expected ambient temperature be considered when determining
maximum PV system voltage?
A. PV module voltage generally increases as temperature decreases
B. PV module voltage becomes independent of temperature in cold
weather
C. PV module current always becomes zero below freezing
D. Cold temperatures eliminate the need for voltage calculations
A. PV module voltage generally increases as temperature decreases
Crystalline PV modules generally produce higher open-circuit voltage at
lower temperatures. Therefore, the cold-weather voltage of a series
string must be evaluated so that equipment voltage ratings are not
exceeded.
5. Which PV module electrical parameter represents the voltage
measured when the module's external circuit is open and no
current is being delivered?
A. Isc
B. Imp
C. Voc
D. Pmax
, C. Voc
Voc means open-circuit voltage. It is measured when the circuit is open
and current is essentially zero, and it is particularly important when
calculating the maximum possible string voltage under cold conditions.
6. Which parameter represents the short-circuit current of a
photovoltaic module?
A. Voc
B. Isc
C. Vmp
D. Vmax
B. Isc
Isc means short-circuit current. It represents the current available when
the module terminals are shorted under specified test conditions and is
an important value when sizing conductors and overcurrent protection.
7. A PV module has a rated maximum-power voltage of 42 V and a
rated maximum-power current of 12 A. What is its approximate
maximum power?
A. 54 W
B. 252 W
C. 504 W
D. 1,008 W
C. 504 W
