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NEC 2023 Code Questions Practice Test 16

Free NEC 2023 practice test with 30 questions on solar photovoltaic (PV) systems and energy storage. Plain-English questions with full explanations.

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This NEC 2023 Code Questions Practice Test 16 has 30 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Mixed-format test — questions jump between topics just like the real exam. Don't spend more than 90 seconds on any one question.

Topics covered: All NEC chapters — branch circuits, grounding, conductors, wiring methods, motors, and more.
Passing score: Aim for 80%+ consistently before scheduling your exam.
Questions: 30 multiple-choice, one correct answer each

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45 min

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NEC 2023 Code Questions Practice Test 16 — Question List

Question 1: NEC Article 690 covers the installation requirements for:

Solar photovoltaic power systems
Elevators
Swimming pools
Signs

NEC Reference: NEC 690.1

Question 2: A PV system disconnecting means must be able to disconnect:

All ungrounded PV conductors
Nothing, it stays connected always
Only the equipment ground
Only half of the panels

NEC Reference: NEC 690.13

Question 3: PV system rapid shutdown is intended mainly to protect:

Firefighters and emergency responders
The solar panels themselves
The utility company profits
Nobody, it has no purpose

NEC Reference: NEC 690.12

Question 4: Within the array boundary, rapid shutdown must reduce voltage to not more than 80 volts within:

30 seconds
5 minutes
1 hour
Immediately, with zero delay

NEC Reference: NEC 690.12(B)(1)

Question 5: Exposed non-current-carrying metal parts of PV module frames and equipment must be:

Grounded
Painted
Left ungrounded always
Removed

NEC Reference: NEC 690.43

Question 6: PV circuit currents used for conductor and overcurrent device sizing are based on values that account for:

Irradiance and temperature effects
The installer's mood
Nothing extra, nameplate only
The color of the panels

NEC Reference: NEC 690.8(A)

Question 7: For PV systems on one- and two-family dwellings, the maximum system voltage is generally limited to:

600 volts
50 volts
5000 volts
There is no limit

NEC Reference: NEC 690.7(C)

Question 8: A PV system disconnect must be marked to indicate it is a:

Photovoltaic system disconnect
Telephone equipment
Water valve
Nothing at all

NEC Reference: NEC 690.13(B)

Question 9: Single-conductor cable used in exposed outdoor PV source and output circuits must be listed and labeled as:

PV wire
Lamp cord
Bare speaker wire
Any random cable

NEC Reference: NEC 690.31(B)

Question 10: Interconnecting a PV inverter output to a service panel busbar is regulated by rules found in:

Article 705
Article 90
Article 500
Article 550

NEC Reference: NEC 705.12

Question 11: The sum of ampere ratings for overcurrent devices on a busbar supplied by both a feeder and a PV source generally must not exceed what percent of the busbar rating?

100 %
120 %
150 %
200 %

NEC Reference: NEC 705.12(B)(3)(2)

Question 12: A backfed circuit breaker used for a PV interconnection must be secured with:

A listed securing means
Tape only
Nothing, it can fall out
Glue

NEC Reference: NEC 705.12(B)(4)

Question 13: A permanent plaque or directory is required at electrical service equipment to indicate:

The location of power sources
The homeowner's birthday
Nothing at all
The paint brand used

NEC Reference: NEC 705.10

Question 14: NEC Article 706 covers permanently installed:

Energy storage systems
Kitchen ranges
Elevators
Swimming pools

NEC Reference: NEC 706.1

Question 15: An energy storage system needs a disconnecting means so it can be:

Isolated from other conductors
Left connected forever
Buried underground with no access
Nothing, disconnects are banned

NEC Reference: NEC 706.15

Question 16: Energy storage system equipment in dwelling units often has installation location restrictions related to:

Fire safety near exits and habitable rooms
Paint color matching
Nothing, any room works
Only bedrooms are allowed

NEC Reference: NEC 706.15

Question 17: NEC Article 705 applies to installations of:

Interconnected power production sources
Only wooden fences
Nothing electrical
Only telephone wiring

NEC Reference: NEC 705.1

Question 18: NEC Article 694 applies to:

Small wind electric systems
Gas ranges
Elevators
Swimming pools

NEC Reference: NEC 694.1

Question 19: NEC Article 692 applies to:

Fuel cell power systems
Playground lighting
Nothing at all
Telephone systems

NEC Reference: NEC 692.1

Question 20: PV modules must be marked with information including:

Maximum voltage and current ratings
The installer's favorite color
Nothing at all
The weather forecast

NEC Reference: NEC 690.51

Question 21: Rooftop PV arrays often require clear access pathways so that:

Firefighters can safely access the roof
Panels can be hidden
Nobody can ever access the roof
It has no safety purpose

NEC Reference: NEC 690.12(B)(2)

Question 22: PV system DC circuit conductors run inside a building are often required to be installed in:

Metal raceway or equivalent
Open air with no protection
Cardboard tubing
Nothing is required

NEC Reference: NEC 690.31(C)

Question 23: Rooms containing certain battery types must have ventilation to prevent buildup of:

Flammable gas
Fresh flowers
Sunlight
Nothing, ventilation is not needed

NEC Reference: NEC 480.10(A)

Question 24: A disconnecting means for a battery system must be provided to disconnect:

The ungrounded battery conductors
Nothing at all
Only the case
Only the label

NEC Reference: NEC 480.7

Question 25: A generator must generally be protected from overload by overcurrent devices or another approved means, based on its:

Nameplate current rating
Fuel tank size
Color
The manufacturer's logo

NEC Reference: NEC 445.12(A)

Question 26: A portable generator frame does not need a grounding electrode when it only supplies equipment mounted on the generator, or:

Cord-and-plug equipment through its own receptacles
The entire city grid
A swimming pool always
A hospital only

NEC Reference: NEC 250.34

Question 27: Generators should be installed in locations that provide adequate ventilation, mainly to disperse:

Exhaust and heat
Music
Light
Nothing, ventilation is unnecessary

NEC Reference: NEC 445.10

Question 28: A transfer switch for an optional standby generator system is used to prevent:

Interconnecting both power sources at once
Turning on any lights
Nothing, it has no purpose
Charging a battery

NEC Reference: NEC 702.5

Question 29: Optional standby systems are intended mainly to protect:

Property or business continuity
Nothing at all
Only decorative lighting
Neighboring homes

NEC Reference: NEC 702.2

Question 30: A PV source connected at the opposite end of a busbar from the main supply typically needs the main breaker to be:

Sized to meet the busbar rating rules
Removed completely
Painted a different color
Ignored entirely

NEC Reference: NEC 705.12(B)(2)

NEC 2023 Code Questions Practice Test 16

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NEC 2023 Code Questions Practice Test 16

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Student Reviews

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NEC 2023 Code Questions Practice Test 16 — Question List

Question 1: NEC Article 690 covers the installation requirements for:

Question 2: A PV system disconnecting means must be able to disconnect:

Question 3: PV system rapid shutdown is intended mainly to protect:

Question 4: Within the array boundary, rapid shutdown must reduce voltage to not more than 80 volts within:

Question 5: Exposed non-current-carrying metal parts of PV module frames and equipment must be:

Question 6: PV circuit currents used for conductor and overcurrent device sizing are based on values that account for:

Question 7: For PV systems on one- and two-family dwellings, the maximum system voltage is generally limited to:

Question 8: A PV system disconnect must be marked to indicate it is a:

Question 9: Single-conductor cable used in exposed outdoor PV source and output circuits must be listed and labeled as:

Question 10: Interconnecting a PV inverter output to a service panel busbar is regulated by rules found in:

Question 11: The sum of ampere ratings for overcurrent devices on a busbar supplied by both a feeder and a PV source generally must not exceed what percent of the busbar rating?

Question 12: A backfed circuit breaker used for a PV interconnection must be secured with:

Question 13: A permanent plaque or directory is required at electrical service equipment to indicate:

Question 14: NEC Article 706 covers permanently installed:

Question 15: An energy storage system needs a disconnecting means so it can be:

Question 16: Energy storage system equipment in dwelling units often has installation location restrictions related to:

Question 17: NEC Article 705 applies to installations of:

Question 18: NEC Article 694 applies to:

Question 19: NEC Article 692 applies to:

Question 20: PV modules must be marked with information including:

Question 21: Rooftop PV arrays often require clear access pathways so that:

Question 22: PV system DC circuit conductors run inside a building are often required to be installed in:

Question 23: Rooms containing certain battery types must have ventilation to prevent buildup of:

Question 24: A disconnecting means for a battery system must be provided to disconnect:

Question 25: A generator must generally be protected from overload by overcurrent devices or another approved means, based on its:

Question 26: A portable generator frame does not need a grounding electrode when it only supplies equipment mounted on the generator, or:

Question 27: Generators should be installed in locations that provide adequate ventilation, mainly to disperse:

Question 28: A transfer switch for an optional standby generator system is used to prevent:

Question 29: Optional standby systems are intended mainly to protect:

Question 30: A PV source connected at the opposite end of a busbar from the main supply typically needs the main breaker to be:

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