ICC RESIDENTIAL ELECTRICAL INSPECTOR (E1) EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
• General Electrical Theory and Principles
• Wiring Methods and Materials
• Overcurrent Protection and Branch Circuits
• Grounding and Bonding
• Services and Feeders
• Equipment and Device Installation
• Special Occupancies and Equipment
• Swimming Pools, Spas, and Fountains
• Renewable Energy Systems (Solar PV)
• Inspection Procedures and Safety
Introduction
,This comprehensive assessment is designed for candidates preparing for the ICC Residential Electrical Inspector (E1)
certification examination. The exam evaluates a candidate’s knowledge of the National Electrical Code (NEC) as it
applies to one- and two-family dwellings, including associated structures. It covers a wide range of topics, from
fundamental electrical theory to complex installation requirements and safety protocols. The questions are presented in
a multiple-choice format, incorporating both direct knowledge-based inquiries and scenario-based problems that test
practical application and critical decision-making skills. This rigorous preparation tool emphasizes the real-world
responsibilities of an inspector, ensuring that candidates are fully prepared to identify code violations, ensure public
safety, and uphold the highest professional standards.
SECTION ONE: QUESTIONS 1–50
1. What is the minimum size of a grounded (neutral) conductor for a 200-ampere residential service, assuming
the service conductors are copper?
A. 3 AWG copper
B. 2 AWG copper
C. 1/0 AWG copper
D. 4/0 AWG copper
,🟢 Correct Answer: B. 2 AWG copper
🔴 Explanation: Table 310.12 (formerly 310.15(B)(7)) allows the grounded conductor for a 200A residential service to
be sized at 2 AWG copper, provided the load calculation does not exceed the conductor's ampacity.
2. The maximum permitted vertical rise of a Type NM cable before it requires additional support in an accessible
attic is:
A. 3 feet
B. 4 feet
C. 4 ½ feet
D. 6 feet
🟢 Correct Answer: C. 4 ½ feet
🔴 Explanation: Section 334.30 states that Type NM cable must be supported within 12 inches of a box and at
intervals not exceeding 4 ½ feet (1.4 m). Vertical runs are supported at the same intervals.
3. Which of the following locations is a "wet location" per the NEC?
, A. A basement with a concrete floor
B. An unfinished garage
C. An exterior wall subject to water runoff
D. A crawlspace with a dirt floor
🟢 Correct Answer: C. An exterior wall subject to water runoff
🔴 Explanation: Article 100 defines a wet location as a location subject to saturation with water or other liquids,
including locations exposed to weather, such as exterior walls.
4. A 120-volt branch circuit is protected by a 20-ampere breaker. What is the maximum total load that can be
connected to this circuit if it supplies continuous and non-continuous loads?
A. 16 amperes
B. 20 amperes
C. 24 amperes
D. 25 amperes
🟢 Correct Answer: A. 16 amperes
DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
• General Electrical Theory and Principles
• Wiring Methods and Materials
• Overcurrent Protection and Branch Circuits
• Grounding and Bonding
• Services and Feeders
• Equipment and Device Installation
• Special Occupancies and Equipment
• Swimming Pools, Spas, and Fountains
• Renewable Energy Systems (Solar PV)
• Inspection Procedures and Safety
Introduction
,This comprehensive assessment is designed for candidates preparing for the ICC Residential Electrical Inspector (E1)
certification examination. The exam evaluates a candidate’s knowledge of the National Electrical Code (NEC) as it
applies to one- and two-family dwellings, including associated structures. It covers a wide range of topics, from
fundamental electrical theory to complex installation requirements and safety protocols. The questions are presented in
a multiple-choice format, incorporating both direct knowledge-based inquiries and scenario-based problems that test
practical application and critical decision-making skills. This rigorous preparation tool emphasizes the real-world
responsibilities of an inspector, ensuring that candidates are fully prepared to identify code violations, ensure public
safety, and uphold the highest professional standards.
SECTION ONE: QUESTIONS 1–50
1. What is the minimum size of a grounded (neutral) conductor for a 200-ampere residential service, assuming
the service conductors are copper?
A. 3 AWG copper
B. 2 AWG copper
C. 1/0 AWG copper
D. 4/0 AWG copper
,🟢 Correct Answer: B. 2 AWG copper
🔴 Explanation: Table 310.12 (formerly 310.15(B)(7)) allows the grounded conductor for a 200A residential service to
be sized at 2 AWG copper, provided the load calculation does not exceed the conductor's ampacity.
2. The maximum permitted vertical rise of a Type NM cable before it requires additional support in an accessible
attic is:
A. 3 feet
B. 4 feet
C. 4 ½ feet
D. 6 feet
🟢 Correct Answer: C. 4 ½ feet
🔴 Explanation: Section 334.30 states that Type NM cable must be supported within 12 inches of a box and at
intervals not exceeding 4 ½ feet (1.4 m). Vertical runs are supported at the same intervals.
3. Which of the following locations is a "wet location" per the NEC?
, A. A basement with a concrete floor
B. An unfinished garage
C. An exterior wall subject to water runoff
D. A crawlspace with a dirt floor
🟢 Correct Answer: C. An exterior wall subject to water runoff
🔴 Explanation: Article 100 defines a wet location as a location subject to saturation with water or other liquids,
including locations exposed to weather, such as exterior walls.
4. A 120-volt branch circuit is protected by a 20-ampere breaker. What is the maximum total load that can be
connected to this circuit if it supplies continuous and non-continuous loads?
A. 16 amperes
B. 20 amperes
C. 24 amperes
D. 25 amperes
🟢 Correct Answer: A. 16 amperes
