NASCLA Electrical Contractor Exam – National
Association of State Contractors Licensing Agencies |
2025/2026 Actual Questions and Verified Answers |
Graded A+
INTRODUCTION / EXAM OVERVIEW
This comprehensive study guide is designed for candidates preparing for the NASCLA
(National Association of State Contractors Licensing Agencies) Electrical Examination for
the 2025/2026 testing cycle. The NASCLA exam is recognized by multiple states for electrical
contractor licensing and covers the 2023 National Electrical Code (NEC) as well as business
and project management principles .
Key NEC Articles to Master:
• Article 90: Introduction (scope, enforcement, mandatory vs. permissive rules)
• Article 100: Definitions
• Article 110: Requirements for Electrical Installations
• Articles 200-285: Wiring and Protection (grounding, overcurrent protection, surge
protection)
• Articles 300-398: Wiring Methods and Materials (conductors, cables, raceways, boxes)
• Articles 400-490: Equipment for General Use (switches, receptacles, panels, motors,
transformers)
• Articles 500-590: Special Occupancies (hazardous locations, health care facilities)
• Articles 600-695: Special Equipment (signs, elevators, emergency systems)
• Articles 700-785: Special Conditions (emergency systems, fire alarm systems)
• Chapters 8 & 9: Communications Systems, Tables, and Examples
Important 2023 NEC Updates:
• GFCI protection requirements expanded (Section 210.8)
• AFCI protection updates
• New Article 691 for large-scale photovoltaic systems
• Service disconnect requirements (230.85)
• Surge protection requirements (230.67, 242)
SECTION 1: GENERAL ELECTRICAL KNOWLEDGE (Questions 1-30)
,Q1
According to NEC Article 100, what is the definition of a "qualified person"?
A. Any person working in the electrical trade
B. One who has skills and knowledge related to the construction and operation of the electrical
equipment and installations and has received safety training to recognize and avoid the hazards
involved [CORRECT]
C. A person with a high school diploma
D. Anyone over the age of 18
Rationale: A qualified person is defined as one who has skills and knowledge related to the
construction and operation of the electrical equipment and installations and has received safety
training to recognize and avoid the hazards involved. This definition emphasizes both
knowledge and safety training .
Q2
NEC Chapter 8 (Communications Systems) is subject to the requirements of Chapter 1-4 only
where specifically referenced. This is an example of:
A. Mandatory rules
B. Permissive rules
C. Chapter independence [CORRECT]
D. Code enforcement
Rationale: Chapter 8 stands alone and is not subject to the general requirements of Chapters 1-
4 unless specifically referenced. This demonstrates the principle of chapter independence in the
NEC structure .
Q3
The word "shall" in the National Electrical Code indicates:
A. A recommendation
B. A permissive rule
C. A mandatory requirement [CORRECT]
D. An optional practice
Rationale: The word "shall" indicates a mandatory requirement that must be followed. "May"
indicates permissive terms, while "shall" denotes requirements that are mandatory .
,Q4
Informational notes in the NEC are:
A. Mandatory requirements
B. Enforcement guidelines
C. Explanatory material that is not mandatory [CORRECT]
D. Code violations
Rationale: Informational notes are for information only and are not enforceable as requirements
of the Code. They provide explanatory material to assist in understanding the Code .
Q5
According to NEC 90.2, which of the following installations is covered by the NEC?
A. Installations in ships and watercraft
B. Installations underground in mines
C. Installations in railway rolling stock
D. Electrical installations in commercial buildings [CORRECT]
Rationale: NEC 90.2(A) covers electrical installations in commercial buildings. Installations in
ships, mines, and railway rolling stock are specifically excluded under 90.2(B) .
Q6
What is the purpose of the National Electrical Code as stated in NEC 90.1?
A. To design electrical systems
B. The practical safeguarding of persons and property from hazards arising from the use of
electricity [CORRECT]
C. To increase electrical sales
D. To standardize all electrical products
Rationale: The purpose of the NEC is the practical safeguarding of persons and property from
hazards arising from the use of electricity. It is not intended as a design specification or
instruction manual .
Q7
A "dwelling unit" is defined in Article 100 as:
A. Any building with four walls
, B. One or more rooms for the use of one or more persons as a housekeeping unit with
permanent provisions for living, sleeping, cooking, and sanitation [CORRECT]
C. A single room with a bed
D. Any commercial space
Rationale: A dwelling unit must have permanent provisions for living, sleeping, cooking, and
sanitation. This distinguishes it from other types of occupancies .
Q8
The voltage rating of a branch circuit is determined by:
A. The connected load
B. The circuit's voltage rating as marked on the overcurrent device [CORRECT]
C. The conductor size
D. The length of the circuit
Rationale: The voltage rating of a branch circuit is determined by the circuit's voltage rating as
marked on the overcurrent device. This ensures proper coordination between the circuit and its
protection .
Q9
According to NEC 110.12, electrical equipment shall be installed in a:
A. Quick and efficient manner
B. Neat and workmanlike manner [CORRECT]
C. Cost-effective manner
D. Temporary manner
Rationale: NEC 110.12 requires that electrical equipment be installed in a neat and workmanlike
manner. This ensures safety, reliability, and professional quality of installations .
Q10
The minimum working space for electrical equipment operating at 600 volts or less, with
exposed live parts on one side and no live or grounded parts on the other side, is:
A. 2 feet
B. 3 feet [CORRECT]
Association of State Contractors Licensing Agencies |
2025/2026 Actual Questions and Verified Answers |
Graded A+
INTRODUCTION / EXAM OVERVIEW
This comprehensive study guide is designed for candidates preparing for the NASCLA
(National Association of State Contractors Licensing Agencies) Electrical Examination for
the 2025/2026 testing cycle. The NASCLA exam is recognized by multiple states for electrical
contractor licensing and covers the 2023 National Electrical Code (NEC) as well as business
and project management principles .
Key NEC Articles to Master:
• Article 90: Introduction (scope, enforcement, mandatory vs. permissive rules)
• Article 100: Definitions
• Article 110: Requirements for Electrical Installations
• Articles 200-285: Wiring and Protection (grounding, overcurrent protection, surge
protection)
• Articles 300-398: Wiring Methods and Materials (conductors, cables, raceways, boxes)
• Articles 400-490: Equipment for General Use (switches, receptacles, panels, motors,
transformers)
• Articles 500-590: Special Occupancies (hazardous locations, health care facilities)
• Articles 600-695: Special Equipment (signs, elevators, emergency systems)
• Articles 700-785: Special Conditions (emergency systems, fire alarm systems)
• Chapters 8 & 9: Communications Systems, Tables, and Examples
Important 2023 NEC Updates:
• GFCI protection requirements expanded (Section 210.8)
• AFCI protection updates
• New Article 691 for large-scale photovoltaic systems
• Service disconnect requirements (230.85)
• Surge protection requirements (230.67, 242)
SECTION 1: GENERAL ELECTRICAL KNOWLEDGE (Questions 1-30)
,Q1
According to NEC Article 100, what is the definition of a "qualified person"?
A. Any person working in the electrical trade
B. One who has skills and knowledge related to the construction and operation of the electrical
equipment and installations and has received safety training to recognize and avoid the hazards
involved [CORRECT]
C. A person with a high school diploma
D. Anyone over the age of 18
Rationale: A qualified person is defined as one who has skills and knowledge related to the
construction and operation of the electrical equipment and installations and has received safety
training to recognize and avoid the hazards involved. This definition emphasizes both
knowledge and safety training .
Q2
NEC Chapter 8 (Communications Systems) is subject to the requirements of Chapter 1-4 only
where specifically referenced. This is an example of:
A. Mandatory rules
B. Permissive rules
C. Chapter independence [CORRECT]
D. Code enforcement
Rationale: Chapter 8 stands alone and is not subject to the general requirements of Chapters 1-
4 unless specifically referenced. This demonstrates the principle of chapter independence in the
NEC structure .
Q3
The word "shall" in the National Electrical Code indicates:
A. A recommendation
B. A permissive rule
C. A mandatory requirement [CORRECT]
D. An optional practice
Rationale: The word "shall" indicates a mandatory requirement that must be followed. "May"
indicates permissive terms, while "shall" denotes requirements that are mandatory .
,Q4
Informational notes in the NEC are:
A. Mandatory requirements
B. Enforcement guidelines
C. Explanatory material that is not mandatory [CORRECT]
D. Code violations
Rationale: Informational notes are for information only and are not enforceable as requirements
of the Code. They provide explanatory material to assist in understanding the Code .
Q5
According to NEC 90.2, which of the following installations is covered by the NEC?
A. Installations in ships and watercraft
B. Installations underground in mines
C. Installations in railway rolling stock
D. Electrical installations in commercial buildings [CORRECT]
Rationale: NEC 90.2(A) covers electrical installations in commercial buildings. Installations in
ships, mines, and railway rolling stock are specifically excluded under 90.2(B) .
Q6
What is the purpose of the National Electrical Code as stated in NEC 90.1?
A. To design electrical systems
B. The practical safeguarding of persons and property from hazards arising from the use of
electricity [CORRECT]
C. To increase electrical sales
D. To standardize all electrical products
Rationale: The purpose of the NEC is the practical safeguarding of persons and property from
hazards arising from the use of electricity. It is not intended as a design specification or
instruction manual .
Q7
A "dwelling unit" is defined in Article 100 as:
A. Any building with four walls
, B. One or more rooms for the use of one or more persons as a housekeeping unit with
permanent provisions for living, sleeping, cooking, and sanitation [CORRECT]
C. A single room with a bed
D. Any commercial space
Rationale: A dwelling unit must have permanent provisions for living, sleeping, cooking, and
sanitation. This distinguishes it from other types of occupancies .
Q8
The voltage rating of a branch circuit is determined by:
A. The connected load
B. The circuit's voltage rating as marked on the overcurrent device [CORRECT]
C. The conductor size
D. The length of the circuit
Rationale: The voltage rating of a branch circuit is determined by the circuit's voltage rating as
marked on the overcurrent device. This ensures proper coordination between the circuit and its
protection .
Q9
According to NEC 110.12, electrical equipment shall be installed in a:
A. Quick and efficient manner
B. Neat and workmanlike manner [CORRECT]
C. Cost-effective manner
D. Temporary manner
Rationale: NEC 110.12 requires that electrical equipment be installed in a neat and workmanlike
manner. This ensures safety, reliability, and professional quality of installations .
Q10
The minimum working space for electrical equipment operating at 600 volts or less, with
exposed live parts on one side and no live or grounded parts on the other side, is:
A. 2 feet
B. 3 feet [CORRECT]
