LOUISIANA ELECTRICAL CONTRACTOR EXAM – CLASSIFICATION 5] – QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM
UPDATE
CORE DOMAINS
1. Electrical Theory and Principles
2. National Electrical Code (NEC) Compliance
3. Grounding and Bonding Systems
4. Wiring Methods and Materials
5. Overcurrent Protection and Circuit Design
6. Electrical Calculations and Load Analysis
7. Safety Standards and OSHA Regulations
8. Louisiana Contractor Licensing Law and Business Practices
9. Professional Ethics and Responsibility
10. Special Occupancies and Equipment
INTRODUCTION
The Louisiana Electrical Contractor Exam – Classification 5 is designed to assess the knowledge, skills,
and competency of candidates seeking licensure to perform electrical contracting work within the state.
This comprehensive examination evaluates foundational electrical theory, practical application of the
National Electrical Code, grounding and bonding principles, wiring methods, overcurrent protection, and
electrical calculations. The exam also tests knowledge of Louisiana contractor licensing laws, safety
standards, and professional ethics. The assessment utilizes multiple-choice and scenario-based questions
that emphasize real-world application, critical thinking, and professional decision-making. Candidates
must demonstrate the ability to interpret code requirements, solve practical installation problems, and
apply sound judgment in workplace situations.
SECTION ONE – QUESTIONS 1–100
Question 1
What is the primary purpose of the National Electrical Code?
A. To establish licensing requirements for electricians
B. To provide minimum safety standards for electrical installations
,C. To determine the cost of electrical work
D. To regulate utility company operations
🟢 B. To provide minimum safety standards for electrical installations
🔴 Explanation: The NEC is a safety code that establishes minimum requirements for electrical
installations to protect persons and property from electrical hazards. It is not a design specification or
installation manual, but rather a baseline for safe practices.
Question 2
According to Ohm's Law, what is the relationship between voltage, current, and resistance?
A. Voltage equals current divided by resistance
B. Current equals voltage multiplied by resistance
C. Voltage equals current multiplied by resistance
D. Resistance equals voltage multiplied by current
🟢 C. Voltage equals current multiplied by resistance
🔴 Explanation: Ohm's Law is expressed as E = I × R, where E represents voltage (electromotive force),
I represents current in amperes, and R represents resistance in ohms. This fundamental relationship
allows calculation of any one value when the other two are known.
Question 3
A contractor is installing a 200-ampere residential service. What is the minimum size copper grounding
electrode conductor required when connecting to a ground rod?
A. 8 AWG
B. 6 AWG
C. 4 AWG
D. 2 AWG
🟢 B. 6 AWG
🔴 Explanation: NEC Table 250.66 specifies that for a service with 2/0 copper or 4/0 aluminum
conductors, the minimum grounding electrode conductor to a rod electrode is 6 AWG copper. The
code permits this minimum size regardless of the service ampacity when the connection is to a rod,
pipe, or plate electrode.
Question 4
What is the maximum number of quarter bends (90-degree bends) permitted between pull points in a
conduit run?
,A. Two
B. Three
C. Four
D. Six
🟢 C. Four
🔴 Explanation: NEC Section 358.26 (for EMT) and similar provisions for other raceways limit the total
bends between pull points to 360 degrees, which equals four quarter bends. This limitation prevents
excessive tension on conductors during pulling and reduces the risk of insulation damage.
Question 5
A project requires 120-volt branch circuits in a commercial kitchen. What type of protection is required
for receptacles serving countertop surfaces?
A. AFCI protection only
B. GFCI protection only
C. Both AFCI and GFCI protection
D. No special protection is required
🟢 B. GFCI protection only
🔴 Explanation: NEC Section 210.8(B) requires GFCI protection for receptacles in commercial kitchens,
including countertop surfaces. AFCI protection is generally required for dwelling unit branch circuits,
not commercial kitchens, making GFCI the applicable requirement here.
Question 6
What is the minimum working space depth required in front of electrical equipment operating at 480
volts to ground, where there is no insulating concrete or masonry wall?
A. 3 feet
B. 3 feet 6 inches
C. 4 feet
D. 5 feet
🟢 C. 4 feet
🔴 Explanation: NEC Table 110.26(A)(1) establishes working space requirements based on voltage to
ground and the presence of insulating barriers. For equipment operating at 277 to 600 volts to ground
with exposed live parts on one side and no live or grounded parts on the other, the minimum depth is
4 feet.
, Question 7
A contractor discovers that a client wants to use flexible cord to permanently wire a wall-mounted air
conditioning unit through a doorway. What should the contractor advise?
A. This is acceptable if the cord is protected from damage
B. This is prohibited by NEC 400.12
C. This is permitted for residential applications only
D. This requires special permission from the utility company
🟢 B. This is prohibited by NEC 400.12
🔴 Explanation: NEC Section 400.12 explicitly prohibits the use of flexible cords and cables as a
substitute for permanent wiring of structures. Running flexible cord through doorways or wall
openings is specifically listed as a prohibited use because of the potential for damage and the lack of
permanent protection.
Question 8
What is the standard general lighting load, in volt-amperes per square foot, for a dwelling unit?
A. 2 VA per square foot
B. 3 VA per square foot
C. 4 VA per square foot
D. 5 VA per square foot
🟢 B. 3 VA per square foot
🔴 Explanation: NEC Section 220.12 and Table 220.12 specify that dwelling units require a general
lighting load of 3 volt-amperes per square foot. This load calculation forms the basis for determining
minimum branch circuit and feeder requirements.
Question 9
A journeyman electrician is installing conductors in a raceway that will pass through an area with an
ambient temperature of 45°C. The conductors have a 90°C insulation rating. What factor must be
applied to the conductor ampacity?
A. 0.71
B. 0.82
C. 0.87
D. 0.91
🟢 C. 0.87
🔴 Explanation: NEC Table 310.15(B)(2)(a) provides ambient temperature correction factors. For a
90°C-rated conductor in a 45°C ambient, the correction factor is 0.87. This factor must be applied to
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM
UPDATE
CORE DOMAINS
1. Electrical Theory and Principles
2. National Electrical Code (NEC) Compliance
3. Grounding and Bonding Systems
4. Wiring Methods and Materials
5. Overcurrent Protection and Circuit Design
6. Electrical Calculations and Load Analysis
7. Safety Standards and OSHA Regulations
8. Louisiana Contractor Licensing Law and Business Practices
9. Professional Ethics and Responsibility
10. Special Occupancies and Equipment
INTRODUCTION
The Louisiana Electrical Contractor Exam – Classification 5 is designed to assess the knowledge, skills,
and competency of candidates seeking licensure to perform electrical contracting work within the state.
This comprehensive examination evaluates foundational electrical theory, practical application of the
National Electrical Code, grounding and bonding principles, wiring methods, overcurrent protection, and
electrical calculations. The exam also tests knowledge of Louisiana contractor licensing laws, safety
standards, and professional ethics. The assessment utilizes multiple-choice and scenario-based questions
that emphasize real-world application, critical thinking, and professional decision-making. Candidates
must demonstrate the ability to interpret code requirements, solve practical installation problems, and
apply sound judgment in workplace situations.
SECTION ONE – QUESTIONS 1–100
Question 1
What is the primary purpose of the National Electrical Code?
A. To establish licensing requirements for electricians
B. To provide minimum safety standards for electrical installations
,C. To determine the cost of electrical work
D. To regulate utility company operations
🟢 B. To provide minimum safety standards for electrical installations
🔴 Explanation: The NEC is a safety code that establishes minimum requirements for electrical
installations to protect persons and property from electrical hazards. It is not a design specification or
installation manual, but rather a baseline for safe practices.
Question 2
According to Ohm's Law, what is the relationship between voltage, current, and resistance?
A. Voltage equals current divided by resistance
B. Current equals voltage multiplied by resistance
C. Voltage equals current multiplied by resistance
D. Resistance equals voltage multiplied by current
🟢 C. Voltage equals current multiplied by resistance
🔴 Explanation: Ohm's Law is expressed as E = I × R, where E represents voltage (electromotive force),
I represents current in amperes, and R represents resistance in ohms. This fundamental relationship
allows calculation of any one value when the other two are known.
Question 3
A contractor is installing a 200-ampere residential service. What is the minimum size copper grounding
electrode conductor required when connecting to a ground rod?
A. 8 AWG
B. 6 AWG
C. 4 AWG
D. 2 AWG
🟢 B. 6 AWG
🔴 Explanation: NEC Table 250.66 specifies that for a service with 2/0 copper or 4/0 aluminum
conductors, the minimum grounding electrode conductor to a rod electrode is 6 AWG copper. The
code permits this minimum size regardless of the service ampacity when the connection is to a rod,
pipe, or plate electrode.
Question 4
What is the maximum number of quarter bends (90-degree bends) permitted between pull points in a
conduit run?
,A. Two
B. Three
C. Four
D. Six
🟢 C. Four
🔴 Explanation: NEC Section 358.26 (for EMT) and similar provisions for other raceways limit the total
bends between pull points to 360 degrees, which equals four quarter bends. This limitation prevents
excessive tension on conductors during pulling and reduces the risk of insulation damage.
Question 5
A project requires 120-volt branch circuits in a commercial kitchen. What type of protection is required
for receptacles serving countertop surfaces?
A. AFCI protection only
B. GFCI protection only
C. Both AFCI and GFCI protection
D. No special protection is required
🟢 B. GFCI protection only
🔴 Explanation: NEC Section 210.8(B) requires GFCI protection for receptacles in commercial kitchens,
including countertop surfaces. AFCI protection is generally required for dwelling unit branch circuits,
not commercial kitchens, making GFCI the applicable requirement here.
Question 6
What is the minimum working space depth required in front of electrical equipment operating at 480
volts to ground, where there is no insulating concrete or masonry wall?
A. 3 feet
B. 3 feet 6 inches
C. 4 feet
D. 5 feet
🟢 C. 4 feet
🔴 Explanation: NEC Table 110.26(A)(1) establishes working space requirements based on voltage to
ground and the presence of insulating barriers. For equipment operating at 277 to 600 volts to ground
with exposed live parts on one side and no live or grounded parts on the other, the minimum depth is
4 feet.
, Question 7
A contractor discovers that a client wants to use flexible cord to permanently wire a wall-mounted air
conditioning unit through a doorway. What should the contractor advise?
A. This is acceptable if the cord is protected from damage
B. This is prohibited by NEC 400.12
C. This is permitted for residential applications only
D. This requires special permission from the utility company
🟢 B. This is prohibited by NEC 400.12
🔴 Explanation: NEC Section 400.12 explicitly prohibits the use of flexible cords and cables as a
substitute for permanent wiring of structures. Running flexible cord through doorways or wall
openings is specifically listed as a prohibited use because of the potential for damage and the lack of
permanent protection.
Question 8
What is the standard general lighting load, in volt-amperes per square foot, for a dwelling unit?
A. 2 VA per square foot
B. 3 VA per square foot
C. 4 VA per square foot
D. 5 VA per square foot
🟢 B. 3 VA per square foot
🔴 Explanation: NEC Section 220.12 and Table 220.12 specify that dwelling units require a general
lighting load of 3 volt-amperes per square foot. This load calculation forms the basis for determining
minimum branch circuit and feeder requirements.
Question 9
A journeyman electrician is installing conductors in a raceway that will pass through an area with an
ambient temperature of 45°C. The conductors have a 90°C insulation rating. What factor must be
applied to the conductor ampacity?
A. 0.71
B. 0.82
C. 0.87
D. 0.91
🟢 C. 0.87
🔴 Explanation: NEC Table 310.15(B)(2)(a) provides ambient temperature correction factors. For a
90°C-rated conductor in a 45°C ambient, the correction factor is 0.87. This factor must be applied to
