ICC Electrical Plans Examiner (E3)
Certification Practice Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of an electrical plan review in building
construction?
A. To approve the contractor's bid for electrical work
B. To ensure that electrical installations comply with applicable codes and
standards
C. To determine the cost of electrical materials
D. To schedule electrical inspections
B. To ensure that electrical installations comply with applicable codes and
standards
Rationale: The primary purpose of electrical plan review is to verify that plans,
drawings, and specifications for electrical installations comply with the National
Electrical Code (NEC) and other applicable codes and standards before
construction begins .
2. Which document provides the primary legal and technical standards for
electrical plan review in most jurisdictions?
A. The International Building Code (IBC)
B. The National Electrical Code (NFPA 70)
C. The International Fire Code (IFC)
D. The National Fire Alarm and Signaling Code (NFPA 72)
,B. The National Electrical Code (NFPA 70)
Rationale: The National Electrical Code (NFPA 70) is the primary standard for
electrical installations in most jurisdictions. The IBC references the NEC, making it
the baseline for electrical plan review .
3. According to NEC Article 90, what is the purpose of the Code?
A. To provide a design guide for electrical engineers
B. To provide practical safeguarding of persons and property from hazards arising
from the use of electricity
C. To serve as a specification manual for electrical equipment manufacturers
D. To provide a training manual for electrical apprentices
B. To provide practical safeguarding of persons and property from hazards
arising from the use of electricity
Rationale: NEC 90.1(A) states that the purpose of the Code is the practical
safeguarding of persons and property from hazards arising from the use of
electricity .
4. Which NEC article covers the general requirements for electrical installations?
A. Article 90
B. Article 100
C. Article 110
D. Article 200
C. Article 110
Rationale: NEC Article 110 covers general requirements for electrical installations,
including examination, identification, installation, and working space
requirements .
5. Under NEC 110.3(B), electrical equipment must be:
A. Installed in accordance with the manufacturer's instructions
B. Installed in accordance with the minimum price available
C. Approved by the local utility company
D. Listed by a nationally recognized testing laboratory only
,A. Installed in accordance with the manufacturer's instructions
Rationale: NEC 110.3(B) requires that electrical equipment be installed and used in
accordance with any instructions included in the listing or labeling .
6. What is the minimum width of the working space in front of electrical
equipment?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
B. 30 inches
Rationale: NEC 110.26(A)(2) requires the working space in front of electrical
equipment to be at least 30 inches wide .
7. What is the minimum headroom clearance required for equipment rated 600V
or less?
A. 6 feet
B. 6 feet 6 inches
C. 7 feet
D. 7 feet 6 inches
B. 6 feet 6 inches
Rationale: NEC 110.26(E) requires 6 feet 6 inches of headroom for equipment
rated 600V or less .
8. When a discrepancy exists between the NEC and a local amendment, which
provision takes precedence?
A. The NEC
B. The more stringent requirement (typically the local amendment)
C. The less restrictive requirement
D. Neither; the plan must be redesigned
B. The more stringent requirement (typically the local amendment)
Rationale: Local jurisdictions may adopt amendments that are more stringent
, than the model NEC. The locally adopted provisions take precedence within that
jurisdiction .
9. For a one-family dwelling, what is the minimum service rating required?
A. 60 amperes
B. 100 amperes
C. 150 amperes
D. 200 amperes
B. 100 amperes
Rationale: NEC 230.79 requires a dwelling unit service to have a rating of not less
than 100 amperes .
10. What is the maximum number of service disconnects permitted to be
grouped at one location?
A. Four
B. Six
C. Eight
D. Ten
B. Six
Rationale: NEC 230.71(A) permits up to six disconnects per service grouped in a
single enclosure or separate enclosures .
11. What is the minimum vertical clearance required for service-drop conductors
at the point of attachment to a building?
A. 10 feet
B. 12 feet
C. 15 feet
D. 18 feet
A. 10 feet
Rationale: NEC 230.26 requires a minimum vertical clearance of 10 feet above
finished grade at the point of attachment .
Certification Practice Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of an electrical plan review in building
construction?
A. To approve the contractor's bid for electrical work
B. To ensure that electrical installations comply with applicable codes and
standards
C. To determine the cost of electrical materials
D. To schedule electrical inspections
B. To ensure that electrical installations comply with applicable codes and
standards
Rationale: The primary purpose of electrical plan review is to verify that plans,
drawings, and specifications for electrical installations comply with the National
Electrical Code (NEC) and other applicable codes and standards before
construction begins .
2. Which document provides the primary legal and technical standards for
electrical plan review in most jurisdictions?
A. The International Building Code (IBC)
B. The National Electrical Code (NFPA 70)
C. The International Fire Code (IFC)
D. The National Fire Alarm and Signaling Code (NFPA 72)
,B. The National Electrical Code (NFPA 70)
Rationale: The National Electrical Code (NFPA 70) is the primary standard for
electrical installations in most jurisdictions. The IBC references the NEC, making it
the baseline for electrical plan review .
3. According to NEC Article 90, what is the purpose of the Code?
A. To provide a design guide for electrical engineers
B. To provide practical safeguarding of persons and property from hazards arising
from the use of electricity
C. To serve as a specification manual for electrical equipment manufacturers
D. To provide a training manual for electrical apprentices
B. To provide practical safeguarding of persons and property from hazards
arising from the use of electricity
Rationale: NEC 90.1(A) states that the purpose of the Code is the practical
safeguarding of persons and property from hazards arising from the use of
electricity .
4. Which NEC article covers the general requirements for electrical installations?
A. Article 90
B. Article 100
C. Article 110
D. Article 200
C. Article 110
Rationale: NEC Article 110 covers general requirements for electrical installations,
including examination, identification, installation, and working space
requirements .
5. Under NEC 110.3(B), electrical equipment must be:
A. Installed in accordance with the manufacturer's instructions
B. Installed in accordance with the minimum price available
C. Approved by the local utility company
D. Listed by a nationally recognized testing laboratory only
,A. Installed in accordance with the manufacturer's instructions
Rationale: NEC 110.3(B) requires that electrical equipment be installed and used in
accordance with any instructions included in the listing or labeling .
6. What is the minimum width of the working space in front of electrical
equipment?
A. 24 inches
B. 30 inches
C. 36 inches
D. 48 inches
B. 30 inches
Rationale: NEC 110.26(A)(2) requires the working space in front of electrical
equipment to be at least 30 inches wide .
7. What is the minimum headroom clearance required for equipment rated 600V
or less?
A. 6 feet
B. 6 feet 6 inches
C. 7 feet
D. 7 feet 6 inches
B. 6 feet 6 inches
Rationale: NEC 110.26(E) requires 6 feet 6 inches of headroom for equipment
rated 600V or less .
8. When a discrepancy exists between the NEC and a local amendment, which
provision takes precedence?
A. The NEC
B. The more stringent requirement (typically the local amendment)
C. The less restrictive requirement
D. Neither; the plan must be redesigned
B. The more stringent requirement (typically the local amendment)
Rationale: Local jurisdictions may adopt amendments that are more stringent
, than the model NEC. The locally adopted provisions take precedence within that
jurisdiction .
9. For a one-family dwelling, what is the minimum service rating required?
A. 60 amperes
B. 100 amperes
C. 150 amperes
D. 200 amperes
B. 100 amperes
Rationale: NEC 230.79 requires a dwelling unit service to have a rating of not less
than 100 amperes .
10. What is the maximum number of service disconnects permitted to be
grouped at one location?
A. Four
B. Six
C. Eight
D. Ten
B. Six
Rationale: NEC 230.71(A) permits up to six disconnects per service grouped in a
single enclosure or separate enclosures .
11. What is the minimum vertical clearance required for service-drop conductors
at the point of attachment to a building?
A. 10 feet
B. 12 feet
C. 15 feet
D. 18 feet
A. 10 feet
Rationale: NEC 230.26 requires a minimum vertical clearance of 10 feet above
finished grade at the point of attachment .
