ICC Electrical Plans Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A minimum branch-circuit conductor size for general lighting loads in
dwelling units is typically based on which NEC article?
A. Article 215
B. Article 210
C. Article 220
D. Article 230
Answer: B. Article 210
Rationale: Article 210 covers branch circuits, including requirements for
conductor sizing and general lighting loads in dwelling units.
2. The standard voltage drop recommendation for branch circuits is:
A. 1%
B. 2%
,C. 5% total system maximum
D. 10%
Answer: C. 5% total system maximum
Rationale: NEC informational notes recommend a maximum of 3% on
branch circuits and 5% total combined feeder and branch circuit voltage
drop.
3. Overcurrent protection for a continuous load should be sized at a
minimum of:
A. 100% of load
B. 110% of load
C. 125% of load
D. 150% of load
Answer: C. 125% of load
Rationale: Continuous loads must be multiplied by 125% for conductor and
overcurrent device sizing per NEC requirements.
4. Which article governs grounding and bonding?
A. Article 250
B. Article 240
C. Article 300
D. Article 310
,Answer: A. Article 250
Rationale: Article 250 covers grounding and bonding requirements for
electrical systems.
5. The minimum clearance for overhead service conductors above
residential driveways is:
A. 10 ft
B. 12 ft
C. 15 ft
D. 18 ft
Answer: C. 15 ft
Rationale: NEC requires at least 12 ft for residential areas and 15 ft over
driveways.
6. The standard calculation method for general lighting load in dwelling
units is:
A. 1 VA per sq ft
B. 2 VA per sq ft
C. 3 VA per sq ft
D. 5 VA per sq ft
, Answer: B. 3 VA per sq ft
Rationale: NEC uses 3 VA per square foot for dwelling unit general lighting
load calculations.
7. Which conductor insulation type is rated for wet locations?
A. THHN
B. THWN
C. TFFN
D. XHHW only
Answer: B. THWN
Rationale: THWN insulation is specifically rated for wet locations and
commonly used in conduit systems.
8. The maximum number of 90°C rated conductors in a conduit affects:
A. Voltage rating
B. Ampacity adjustment
C. Grounding method
D. Box fill only
Answer: B. Ampacity adjustment
Rationale: More than three current-carrying conductors require derating of
ampacity due to heat buildup.
9. Which NEC article covers motors?
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A minimum branch-circuit conductor size for general lighting loads in
dwelling units is typically based on which NEC article?
A. Article 215
B. Article 210
C. Article 220
D. Article 230
Answer: B. Article 210
Rationale: Article 210 covers branch circuits, including requirements for
conductor sizing and general lighting loads in dwelling units.
2. The standard voltage drop recommendation for branch circuits is:
A. 1%
B. 2%
,C. 5% total system maximum
D. 10%
Answer: C. 5% total system maximum
Rationale: NEC informational notes recommend a maximum of 3% on
branch circuits and 5% total combined feeder and branch circuit voltage
drop.
3. Overcurrent protection for a continuous load should be sized at a
minimum of:
A. 100% of load
B. 110% of load
C. 125% of load
D. 150% of load
Answer: C. 125% of load
Rationale: Continuous loads must be multiplied by 125% for conductor and
overcurrent device sizing per NEC requirements.
4. Which article governs grounding and bonding?
A. Article 250
B. Article 240
C. Article 300
D. Article 310
,Answer: A. Article 250
Rationale: Article 250 covers grounding and bonding requirements for
electrical systems.
5. The minimum clearance for overhead service conductors above
residential driveways is:
A. 10 ft
B. 12 ft
C. 15 ft
D. 18 ft
Answer: C. 15 ft
Rationale: NEC requires at least 12 ft for residential areas and 15 ft over
driveways.
6. The standard calculation method for general lighting load in dwelling
units is:
A. 1 VA per sq ft
B. 2 VA per sq ft
C. 3 VA per sq ft
D. 5 VA per sq ft
, Answer: B. 3 VA per sq ft
Rationale: NEC uses 3 VA per square foot for dwelling unit general lighting
load calculations.
7. Which conductor insulation type is rated for wet locations?
A. THHN
B. THWN
C. TFFN
D. XHHW only
Answer: B. THWN
Rationale: THWN insulation is specifically rated for wet locations and
commonly used in conduit systems.
8. The maximum number of 90°C rated conductors in a conduit affects:
A. Voltage rating
B. Ampacity adjustment
C. Grounding method
D. Box fill only
Answer: B. Ampacity adjustment
Rationale: More than three current-carrying conductors require derating of
ampacity due to heat buildup.
9. Which NEC article covers motors?
