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ICC RESIDENTIAL ELECTRICAL INSPECTOR (E1): LOAD
CALCULATIONS, GROUNDING, AND GFCI/AFCI REQUIREMENTS
Original Questions with Answers and Rationales
Section 1: Load Calculations (Questions)
1. What is the general lighting load calculation for a dwelling
unit per the NEC?
A. 1 VA per square foot
B. 2 VA per square foot
C. 3 VA per square foot
D. 5 VA per square foot
Answer: C
Rationale: The NEC requires a general lighting load of 3
volt-amperes per square foot of living area for dwelling
units. This covers general illumination and general-
purpose receptacles.
2. A dwelling unit has a living area of 2,500 square feet. What
is the general lighting load?
A. 5,000 VA
B. 7,500 VA
C. 10,000 VA
D. 12,500 VA
Answer: B
Rationale: General lighting load = 2,500 sq ft × 3 VA/sq ft
= 7,500 VA.
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3. How many volt-amperes are allocated per small appliance
branch circuit in dwelling unit load calculations?
A. 1,000 VA
B. 1,500 VA
C. 2,000 VA
D. 3,000 VA
Answer: B
Rationale: Each small appliance branch circuit (minimum
two required) is calculated at 1,500 VA each for load
calculation purposes.
4. How many volt-amperes are allocated for the laundry
branch circuit in dwelling unit load calculations?
A. 1,000 VA
B. 1,500 VA
C. 2,000 VA
D. 3,000 VA
Answer: B
Rationale: The required laundry branch circuit is
calculated at 1,500 VA, consistent with small appliance
circuits.
5. What is the demand factor applied to the first 3,000 VA of
general lighting load in a dwelling unit?
A. 50%
B. 75%
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C. 100%
D. 125%
Answer: C
Rationale: The first 3,000 VA of general lighting load is
calculated at 100% (no demand reduction). Loads above
3,000 VA receive a 35% demand factor.
6. What is the demand factor applied to general lighting load
above 3,000 VA in a dwelling unit?
A. 25%
B. 35%
C. 50%
D. 75%
Answer: B
Rationale: The portion of general lighting load exceeding
3,000 VA is subject to a 35% demand factor, recognizing
that not all lighting and receptacles are used
simultaneously.
7. What is the minimum service size required for a single-
family dwelling unit?
A. 60 amperes
B. 100 amperes
C. 150 amperes
D. 200 amperes
Answer: B
ICC RESIDENTIAL ELECTRICAL INSPECTOR (E1): LOAD
CALCULATIONS, GROUNDING, AND GFCI/AFCI REQUIREMENTS
Original Questions with Answers and Rationales
Section 1: Load Calculations (Questions)
1. What is the general lighting load calculation for a dwelling
unit per the NEC?
A. 1 VA per square foot
B. 2 VA per square foot
C. 3 VA per square foot
D. 5 VA per square foot
Answer: C
Rationale: The NEC requires a general lighting load of 3
volt-amperes per square foot of living area for dwelling
units. This covers general illumination and general-
purpose receptacles.
2. A dwelling unit has a living area of 2,500 square feet. What
is the general lighting load?
A. 5,000 VA
B. 7,500 VA
C. 10,000 VA
D. 12,500 VA
Answer: B
Rationale: General lighting load = 2,500 sq ft × 3 VA/sq ft
= 7,500 VA.
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3. How many volt-amperes are allocated per small appliance
branch circuit in dwelling unit load calculations?
A. 1,000 VA
B. 1,500 VA
C. 2,000 VA
D. 3,000 VA
Answer: B
Rationale: Each small appliance branch circuit (minimum
two required) is calculated at 1,500 VA each for load
calculation purposes.
4. How many volt-amperes are allocated for the laundry
branch circuit in dwelling unit load calculations?
A. 1,000 VA
B. 1,500 VA
C. 2,000 VA
D. 3,000 VA
Answer: B
Rationale: The required laundry branch circuit is
calculated at 1,500 VA, consistent with small appliance
circuits.
5. What is the demand factor applied to the first 3,000 VA of
general lighting load in a dwelling unit?
A. 50%
B. 75%
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C. 100%
D. 125%
Answer: C
Rationale: The first 3,000 VA of general lighting load is
calculated at 100% (no demand reduction). Loads above
3,000 VA receive a 35% demand factor.
6. What is the demand factor applied to general lighting load
above 3,000 VA in a dwelling unit?
A. 25%
B. 35%
C. 50%
D. 75%
Answer: B
Rationale: The portion of general lighting load exceeding
3,000 VA is subject to a 35% demand factor, recognizing
that not all lighting and receptacles are used
simultaneously.
7. What is the minimum service size required for a single-
family dwelling unit?
A. 60 amperes
B. 100 amperes
C. 150 amperes
D. 200 amperes
Answer: B
