VIRGINIA MASTER ELECTRICIAN EXAM Newest (2026
Update) Actual Practice Questions – Set 100 Most
Common Exam Questions And Answers In Details 100%
Verified Exam Highly Recommendable For Grade A+
QUESTION 1
A 120/240V single-phase, 3-wire system supplies a dwelling unit. What is the
maximum allowable voltage drop for branch circuits recommended for efficient
operation?
A. 1%
B. 3%
C. 5%
D. 10%
Answer: B ✔
Rationale: (B – 3%) is the recommended maximum voltage drop for branch circuits
per NEC informational guidelines to ensure proper equipment performance and
efficiency.
QUESTION 2
According to NEC, which conductor is required to be grounded in a 120/240V
single-phase system?
A. Hot conductor
B. Equipment grounding conductor
C. Neutral conductor
D. All conductors
,Answer: C ✔
Rationale: (C – Neutral conductor) is the grounded conductor in a 120/240V
system, carrying return current under normal operation.
QUESTION 3
What is the minimum working clearance depth required for a 480V panel with
exposed live parts on one side and grounded surface on the other?
A. 3 ft
B. 3.5 ft
C. 4 ft
D. 5 ft
Answer: D ✔
Rationale: (D – 5 ft) is required clearance for 480V systems with grounded surfaces
per NEC Table 110.26.
QUESTION 4
A 20A, 120V general-purpose branch circuit is installed in a dwelling. What is the
minimum required conductor size?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B ✔
Rationale: (B – 12 AWG) copper is minimum for 20A circuits per NEC ampacity
rules.
,QUESTION 5
What type of grounding electrode is MOST commonly used in residential
construction?
A. Concrete-encased electrode
B. Metal water pipe only
C. Ground rod
D. Structural steel only
Answer: C ✔
Rationale: (C – Ground rod) is the most commonly installed grounding electrode in
residential systems.
QUESTION 6
In a dwelling unit kitchen, receptacles serving countertop surfaces must be
installed so that no point along the wall is more than what distance from a
receptacle?
A. 2 ft
B. 3 ft
C. 4 ft
D. 6 ft
Answer: C ✔
Rationale: (C – 4 ft) spacing ensures proper small appliance coverage per NEC
210.52.
QUESTION 7
Which device is required for protection of personnel against ground-faults in
bathroom receptacles?
A. AFCI
B. GFCI
, C. Fuse
D. Surge protector
Answer: B ✔
Rationale: (B – GFCI) protects against shock hazards from ground faults in wet
locations.
QUESTION 8
What is the maximum number of current-carrying conductors permitted in a 1-
inch EMT conduit (THHN 12 AWG) without derating?
A. 2
B. 3
C. 9
D. 12
Answer: C ✔
Rationale: (C – 9 conductors) is the maximum before ampacity adjustment is
required per NEC conduit fill rules.
QUESTION 9
A 240V load draws 24A continuously. What is the minimum circuit ampacity
required?
A. 24A
B. 30A
C. 40A
D. 50A
Answer: B ✔
Rationale: (B – 30A) because continuous loads require 125% sizing (24 × 1.25 =
30A).
Update) Actual Practice Questions – Set 100 Most
Common Exam Questions And Answers In Details 100%
Verified Exam Highly Recommendable For Grade A+
QUESTION 1
A 120/240V single-phase, 3-wire system supplies a dwelling unit. What is the
maximum allowable voltage drop for branch circuits recommended for efficient
operation?
A. 1%
B. 3%
C. 5%
D. 10%
Answer: B ✔
Rationale: (B – 3%) is the recommended maximum voltage drop for branch circuits
per NEC informational guidelines to ensure proper equipment performance and
efficiency.
QUESTION 2
According to NEC, which conductor is required to be grounded in a 120/240V
single-phase system?
A. Hot conductor
B. Equipment grounding conductor
C. Neutral conductor
D. All conductors
,Answer: C ✔
Rationale: (C – Neutral conductor) is the grounded conductor in a 120/240V
system, carrying return current under normal operation.
QUESTION 3
What is the minimum working clearance depth required for a 480V panel with
exposed live parts on one side and grounded surface on the other?
A. 3 ft
B. 3.5 ft
C. 4 ft
D. 5 ft
Answer: D ✔
Rationale: (D – 5 ft) is required clearance for 480V systems with grounded surfaces
per NEC Table 110.26.
QUESTION 4
A 20A, 120V general-purpose branch circuit is installed in a dwelling. What is the
minimum required conductor size?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B ✔
Rationale: (B – 12 AWG) copper is minimum for 20A circuits per NEC ampacity
rules.
,QUESTION 5
What type of grounding electrode is MOST commonly used in residential
construction?
A. Concrete-encased electrode
B. Metal water pipe only
C. Ground rod
D. Structural steel only
Answer: C ✔
Rationale: (C – Ground rod) is the most commonly installed grounding electrode in
residential systems.
QUESTION 6
In a dwelling unit kitchen, receptacles serving countertop surfaces must be
installed so that no point along the wall is more than what distance from a
receptacle?
A. 2 ft
B. 3 ft
C. 4 ft
D. 6 ft
Answer: C ✔
Rationale: (C – 4 ft) spacing ensures proper small appliance coverage per NEC
210.52.
QUESTION 7
Which device is required for protection of personnel against ground-faults in
bathroom receptacles?
A. AFCI
B. GFCI
, C. Fuse
D. Surge protector
Answer: B ✔
Rationale: (B – GFCI) protects against shock hazards from ground faults in wet
locations.
QUESTION 8
What is the maximum number of current-carrying conductors permitted in a 1-
inch EMT conduit (THHN 12 AWG) without derating?
A. 2
B. 3
C. 9
D. 12
Answer: C ✔
Rationale: (C – 9 conductors) is the maximum before ampacity adjustment is
required per NEC conduit fill rules.
QUESTION 9
A 240V load draws 24A continuously. What is the minimum circuit ampacity
required?
A. 24A
B. 30A
C. 40A
D. 50A
Answer: B ✔
Rationale: (B – 30A) because continuous loads require 125% sizing (24 × 1.25 =
30A).
