Electrical Contractor Practice Exam
Question Answers) Plus Rationales 2026
Q&A Instant Download Pdf And Correct
Answers (Verified
1
The minimum size copper grounding electrode conductor for a 200-amp
residential service is:
A. 6 AWG
B. 4 AWG
C. 2 AWG
D. 1/0 AWG
Rationale: The NEC requires a 4 AWG copper GEC for 200-amp services
connected to a ground rod system.
2
Type NM cable is permitted in which of the following locations?
A. Wet locations
B. Outdoors exposed to sunlight
C. Within residential wood-frame construction
D. Embedded in concrete
Rationale: NM cable is allowed only in dry, non-corrosive indoor locations such
as wood-frame homes.
3
What is the standard voltage drop recommendation for branch circuits?
A. No more than 3%
B. 5%
C. 10%
D. 1%
,Rationale: Industry practice suggests limiting voltage drop to 3% on branch
circuits for efficiency.
4
A 20-amp small appliance circuit in a kitchen requires what minimum conductor
size?
A. 16 AWG
B. 12 AWG
C. 10 AWG
D. 14 AWG
Rationale: A 20-amp circuit requires 12-gauge conductors as per NEC ampacity
tables.
5
Ground rods must have a minimum length of:
A. 4 feet
B. 5 feet
C. 6 feet
D. 8 feet
Rationale: NEC requires ground rods be at least 8 ft in length, driven full length.
6
Maximum distance between supports for EMT is:
A. 5 ft
B. 10 ft
C. 15 ft
D. 20 ft
Rationale: EMT must be supported every 10 ft; also within 3 ft of boxes.
7
Minimum burial depth for direct-buried UF cable under residential yards is:
A. 6 in
B. 12 in
, C. 24 in
D. 36 in
Rationale: UF cable must be buried at least 24 inches deep in residential yards.
8
A 30-amp dryer circuit requires what receptacle configuration?
A. 5-15R
B. 6-15R
C. 14-30R
D. 6-50R
Rationale: Dryers on 30-amp circuits use the 14-30R receptacle.
9
Maximum number of 12-AWG conductors allowed in a 4” square box 1-1/2" deep
(21 cu. in):
A. 8
B. 10
C. 9
D. 11
Rationale: 12 AWG conductors require 2.25 cu in each; 21 ÷ 2.25 ≈ 9.
10
The maximum continuous load allowed on a 20-amp circuit is:
A. 16 amps
B. 20 amps
C. 22 amps
D. 14 amps
Rationale: Continuous loads must not exceed 80% of circuit rating (20 × 0.8 =
16).
11
The minimum working clearance in front of electrical equipment operating at
120–600V is:
Question Answers) Plus Rationales 2026
Q&A Instant Download Pdf And Correct
Answers (Verified
1
The minimum size copper grounding electrode conductor for a 200-amp
residential service is:
A. 6 AWG
B. 4 AWG
C. 2 AWG
D. 1/0 AWG
Rationale: The NEC requires a 4 AWG copper GEC for 200-amp services
connected to a ground rod system.
2
Type NM cable is permitted in which of the following locations?
A. Wet locations
B. Outdoors exposed to sunlight
C. Within residential wood-frame construction
D. Embedded in concrete
Rationale: NM cable is allowed only in dry, non-corrosive indoor locations such
as wood-frame homes.
3
What is the standard voltage drop recommendation for branch circuits?
A. No more than 3%
B. 5%
C. 10%
D. 1%
,Rationale: Industry practice suggests limiting voltage drop to 3% on branch
circuits for efficiency.
4
A 20-amp small appliance circuit in a kitchen requires what minimum conductor
size?
A. 16 AWG
B. 12 AWG
C. 10 AWG
D. 14 AWG
Rationale: A 20-amp circuit requires 12-gauge conductors as per NEC ampacity
tables.
5
Ground rods must have a minimum length of:
A. 4 feet
B. 5 feet
C. 6 feet
D. 8 feet
Rationale: NEC requires ground rods be at least 8 ft in length, driven full length.
6
Maximum distance between supports for EMT is:
A. 5 ft
B. 10 ft
C. 15 ft
D. 20 ft
Rationale: EMT must be supported every 10 ft; also within 3 ft of boxes.
7
Minimum burial depth for direct-buried UF cable under residential yards is:
A. 6 in
B. 12 in
, C. 24 in
D. 36 in
Rationale: UF cable must be buried at least 24 inches deep in residential yards.
8
A 30-amp dryer circuit requires what receptacle configuration?
A. 5-15R
B. 6-15R
C. 14-30R
D. 6-50R
Rationale: Dryers on 30-amp circuits use the 14-30R receptacle.
9
Maximum number of 12-AWG conductors allowed in a 4” square box 1-1/2" deep
(21 cu. in):
A. 8
B. 10
C. 9
D. 11
Rationale: 12 AWG conductors require 2.25 cu in each; 21 ÷ 2.25 ≈ 9.
10
The maximum continuous load allowed on a 20-amp circuit is:
A. 16 amps
B. 20 amps
C. 22 amps
D. 14 amps
Rationale: Continuous loads must not exceed 80% of circuit rating (20 × 0.8 =
16).
11
The minimum working clearance in front of electrical equipment operating at
120–600V is:
