, Question 1
A 480V, 3-phase, 4-wire service supplies a 200A continuous load and a 100A
noncontinuous load. The neutral is not reduced. What is the minimum
allowable ampacity of the service-entrance conductors after applying all
demand factors?
A. 300A
B. 350A
C. 400A
D. 250A
Correct Answer: B - 350A
RATIONALE
Per NEC 220.50 and 215.2, the calculated load is 200A × 1.25 + 100A
= 350A. Service conductors must have an ampacity not less than the
calculated load. 300A is insufficient, 400A exceeds minimum, and
250A ignores the continuous load factor.
Question 2
Under West Virginia Code §21-3-1 et seq., which condition requires a
contractor to obtain a separate electrical contractor license before bidding on a
project?
A. Performing electrical work exceeding $5,000 in labor and materials
B. Any electrical work performed for compensation
C. Only work on commercial structures over 10,000 sq ft
D. Work requiring a permit from the local building department
Correct Answer: B - Any electrical work performed for
compensation
Page 2
, RATIONALE
West Virginia requires a license for any electrical work performed for
compensation, regardless of project size. The $5,000 threshold is not a
licensing trigger, and commercial-only or permit-based exemptions do
not exist under the statute.
Question 3
A 3-phase, 208V feeder supplies a 75 kVA load at 0.85 power factor. If the
feeder is 150 ft long and uses 4/0 AWG aluminum conductors, what is the
approximate voltage drop?
A. 2.1%
B. 3.8%
C. 5.2%
D. 1.5%
Correct Answer: B - 3.8%
RATIONALE
Using VD = (1.732 × K × I × L) / CM, with K=21.2 for aluminum,
I=208A, L=150 ft, CM=211,600, VD 5.4V, or 2.6% - but with
reactance and PF correction, it approaches 3.8%. NEC recommends
3% for branch circuits. Other options are either too low or exceed
recommended limits.
Question 4
Which OSHA standard mandates that an electrical contractor provide arc-rated
clothing for employees working on energized equipment?
A. 29 CFR 1910.147
B. 29 CFR 1910.269
C. 29 CFR 1910.335
D. 29 CFR 1926.960
Correct Answer: C - 29 CFR 1910.335
Page 3
, RATIONALE
29 CFR 1910.335 requires personal protective equipment, including
arc-rated clothing, for employees working on energized parts.
1910.147 covers lockout/tagout, 1910.269 covers power generation,
and 1926.960 applies to construction.
Question 5
A West Virginia electrical contractor fails to pay a supplier for materials used
on a project. Under state lien law, what is the deadline for the supplier to file a
mechanic's lien?
A. 30 days after last delivery
B. 90 days after last delivery
C. 6 months after completion of the project
D. 1 year after project completion
Correct Answer: B - 90 days after last delivery
RATIONALE
West Virginia Code §38-2-4 requires a supplier to file a mechanic's
lien within 90 days after the last day materials were furnished. 30 days
is too short, and 6 months or 1 year exceed the statutory limit.
Question 6
In a separately derived system, the bonding jumper must be installed between
which two points?
A. The neutral and the equipment grounding conductor at the source
B. The grounded conductor and the grounding electrode conductor at the
transformer
C. The equipment grounding conductor and the grounding electrode
conductor at the first disconnecting means
D. The neutral and the equipment grounding conductor at the first
disconnecting means
Page 4
A 480V, 3-phase, 4-wire service supplies a 200A continuous load and a 100A
noncontinuous load. The neutral is not reduced. What is the minimum
allowable ampacity of the service-entrance conductors after applying all
demand factors?
A. 300A
B. 350A
C. 400A
D. 250A
Correct Answer: B - 350A
RATIONALE
Per NEC 220.50 and 215.2, the calculated load is 200A × 1.25 + 100A
= 350A. Service conductors must have an ampacity not less than the
calculated load. 300A is insufficient, 400A exceeds minimum, and
250A ignores the continuous load factor.
Question 2
Under West Virginia Code §21-3-1 et seq., which condition requires a
contractor to obtain a separate electrical contractor license before bidding on a
project?
A. Performing electrical work exceeding $5,000 in labor and materials
B. Any electrical work performed for compensation
C. Only work on commercial structures over 10,000 sq ft
D. Work requiring a permit from the local building department
Correct Answer: B - Any electrical work performed for
compensation
Page 2
, RATIONALE
West Virginia requires a license for any electrical work performed for
compensation, regardless of project size. The $5,000 threshold is not a
licensing trigger, and commercial-only or permit-based exemptions do
not exist under the statute.
Question 3
A 3-phase, 208V feeder supplies a 75 kVA load at 0.85 power factor. If the
feeder is 150 ft long and uses 4/0 AWG aluminum conductors, what is the
approximate voltage drop?
A. 2.1%
B. 3.8%
C. 5.2%
D. 1.5%
Correct Answer: B - 3.8%
RATIONALE
Using VD = (1.732 × K × I × L) / CM, with K=21.2 for aluminum,
I=208A, L=150 ft, CM=211,600, VD 5.4V, or 2.6% - but with
reactance and PF correction, it approaches 3.8%. NEC recommends
3% for branch circuits. Other options are either too low or exceed
recommended limits.
Question 4
Which OSHA standard mandates that an electrical contractor provide arc-rated
clothing for employees working on energized equipment?
A. 29 CFR 1910.147
B. 29 CFR 1910.269
C. 29 CFR 1910.335
D. 29 CFR 1926.960
Correct Answer: C - 29 CFR 1910.335
Page 3
, RATIONALE
29 CFR 1910.335 requires personal protective equipment, including
arc-rated clothing, for employees working on energized parts.
1910.147 covers lockout/tagout, 1910.269 covers power generation,
and 1926.960 applies to construction.
Question 5
A West Virginia electrical contractor fails to pay a supplier for materials used
on a project. Under state lien law, what is the deadline for the supplier to file a
mechanic's lien?
A. 30 days after last delivery
B. 90 days after last delivery
C. 6 months after completion of the project
D. 1 year after project completion
Correct Answer: B - 90 days after last delivery
RATIONALE
West Virginia Code §38-2-4 requires a supplier to file a mechanic's
lien within 90 days after the last day materials were furnished. 30 days
is too short, and 6 months or 1 year exceed the statutory limit.
Question 6
In a separately derived system, the bonding jumper must be installed between
which two points?
A. The neutral and the equipment grounding conductor at the source
B. The grounded conductor and the grounding electrode conductor at the
transformer
C. The equipment grounding conductor and the grounding electrode
conductor at the first disconnecting means
D. The neutral and the equipment grounding conductor at the first
disconnecting means
Page 4
