WA Master Electrician 07Nonresidential
Maintenanceination (OLD VERSION)
Exam Questions With Correct Solutions,
Already Passed!!
1. According to WAC 296-46B-920, what is the defining characteristic of the
"Maintenance" scope of work for an 07 electrician?
A) Installing new branch circuits for additional office equipment
B) Replacing existing electrical equipment with like-in-kind components without
extending circuits
C) Designing new lighting layouts for building renovations
D) Increasing panel bus ratings to accommodate future loads
Answer: B
Explanation: WAC 296-46B-920 explicitly limits the 07 certificate to maintenance, which
is defined as the repair or replacement of existing equipment and conductors with like-
in-kind materials. New circuits, relocation of outlets, or design work falls under a general
electrician's scope .
2. What is the minimum working space depth required in front of a 400-ampere
panelboard operating at 120/208 volts?
A) 2 feet
B) 3 feet
C) 3.5 feet
D) 4 feet
Answer: B
Explanation: NEC Table 110.26(A)(1) requires a minimum clear working space of 3 feet
(36 inches) for equipment operating at 150 volts to ground or less where there are
,exposed live parts on one side and grounded parts on the other. For 400A, the condition
of installation dictates the depth, but for voltage under 150V, 3 feet is the standard.
3. You are replacing a motor starter. Per NEC 110.14(D), how must the terminal
screws be torqued?
A) Hand tight plus a quarter turn
B) As tight as possible to prevent loosening
C) To the manufacturer's specified torque value
D) 15 inch-pounds for all terminals
Answer: C
Explanation: NEC 110.14(D) requires that terminations be torqued to the
manufacturer's specifications. Over-torquing can strip threads or break conductors,
while under-torquing causes overheating due to high resistance connections .
4. If a 07 electrician finds asbestos-insulated wiring inside a commercial fixture
during a retrofit, what is the required first step?
A) Carefully remove the wiring and dispose of it in the standard dumpster
B) Spray the wiring with water to encapsulate the fibers
C) Stop work and notify the building owner and supervisor
D) Proceed with the work while wearing a standard dust mask
Answer: C
Explanation: Asbestos is a hazardous material regulated by OSHA and L&I. Disturbing it
is illegal without proper containment and disposal procedures. The electrician must stop
immediately, alert the supervisor/owner, and ensure a qualified abatement team handles
it.
5. What is the maximum permitted fill percentage for a conduit (raceway)
containing three conductors?
A) 40%
B) 50%
C) 60%
D) 75%
,Answer: A
Explanation: NEC Chapter 9, Table 1, indicates that for three or more conductors, the
conduit fill cannot exceed 40% of the raceway's interior cross-sectional area to allow for
heat dissipation and ease of pulling.
6. When working in a damp mechanical room, which safety practice is most critical
for using a portable power drill?
A) Using a double insulated or GFCI-protected drill
B) Wearing cotton gloves
C) Removing the grounding pin for better fit
D) Using an aluminum ladder
Answer: A
Explanation: Damp conditions lower the body's resistance to electric shock. GFCI
protection (or a double-insulated tool) is critical because it will trip the circuit quickly if a
ground fault occurs, potentially saving the user from a fatal shock .
7. A fluorescent lighting fixture fails. The 07 electrician determines the ballast is
bad. What must be true regarding the replacement ballast?
A) It must be the exact same manufacturer as the fixture
B) It must be listed and identified for use in that specific fixture
C) It must be a magnetic ballast because electronic are not allowed for maintenance
D) It must operate at a higher voltage than the original
Answer: B
Explanation: NEC 410.130 and general listing requirements (UL) mandate that
replacement parts, particularly ballasts and drivers, must be suitable for the marked
electrical and mechanical characteristics of the fixture and the lamps used .
8. In a 3-phase wye system, what is the line-to-neutral voltage if the line-to-line
voltage is 480 volts?
A) 120V
B) 208V
C) 240V
, D) 277V
Answer: D
Explanation: In a wye system, Line-to-Neutral voltage = Line-to-Line voltage / √3. 480V
/ 1.73 = approximately 277V. This is common for commercial lighting loads.
9. While performing lockout/tagout (LOTO) on an industrial conveyor, multiple
electricians are working on different parts. How is the lockout applied?
A) The supervisor applies one lock for the whole crew to save time
B) Each electrician applies their own personal lock to the disconnect
C) Only the senior electrician applies a lock, others rely on tags
D) Tags are sufficient since the machine is in sight
Answer: B
Explanation: OSHA and WISHA require each individual employee to apply their own
personal lock and key to the energy isolating device to ensure that no one can re-
energize the equipment while any single person is working on it .
10. What is the ampacity of a 10 AWG THHN copper conductor at 75°C in a dry
location?
A) 30 Amps
B) 35 Amps
C) 40 Amps
D) 50 Amps
Answer: B
Explanation: Per NEC Table 310.16 (formerly 310.15(B)(16)), 10 AWG copper with THHN
insulation at 90°C is rated for 40A, but when terminated on equipment (breakers,
switches) rated for 75°C (common for panels under 100A), the ampacity must be based
on the 75°C column, which is 35A.
11. WAC 296-46B-920(h) specifically restricts 07 electricians from working outside
the luminaire body. What does this imply for an LED retrofit requiring a new driver
box?
A) It is allowed if the driver is listed
Maintenanceination (OLD VERSION)
Exam Questions With Correct Solutions,
Already Passed!!
1. According to WAC 296-46B-920, what is the defining characteristic of the
"Maintenance" scope of work for an 07 electrician?
A) Installing new branch circuits for additional office equipment
B) Replacing existing electrical equipment with like-in-kind components without
extending circuits
C) Designing new lighting layouts for building renovations
D) Increasing panel bus ratings to accommodate future loads
Answer: B
Explanation: WAC 296-46B-920 explicitly limits the 07 certificate to maintenance, which
is defined as the repair or replacement of existing equipment and conductors with like-
in-kind materials. New circuits, relocation of outlets, or design work falls under a general
electrician's scope .
2. What is the minimum working space depth required in front of a 400-ampere
panelboard operating at 120/208 volts?
A) 2 feet
B) 3 feet
C) 3.5 feet
D) 4 feet
Answer: B
Explanation: NEC Table 110.26(A)(1) requires a minimum clear working space of 3 feet
(36 inches) for equipment operating at 150 volts to ground or less where there are
,exposed live parts on one side and grounded parts on the other. For 400A, the condition
of installation dictates the depth, but for voltage under 150V, 3 feet is the standard.
3. You are replacing a motor starter. Per NEC 110.14(D), how must the terminal
screws be torqued?
A) Hand tight plus a quarter turn
B) As tight as possible to prevent loosening
C) To the manufacturer's specified torque value
D) 15 inch-pounds for all terminals
Answer: C
Explanation: NEC 110.14(D) requires that terminations be torqued to the
manufacturer's specifications. Over-torquing can strip threads or break conductors,
while under-torquing causes overheating due to high resistance connections .
4. If a 07 electrician finds asbestos-insulated wiring inside a commercial fixture
during a retrofit, what is the required first step?
A) Carefully remove the wiring and dispose of it in the standard dumpster
B) Spray the wiring with water to encapsulate the fibers
C) Stop work and notify the building owner and supervisor
D) Proceed with the work while wearing a standard dust mask
Answer: C
Explanation: Asbestos is a hazardous material regulated by OSHA and L&I. Disturbing it
is illegal without proper containment and disposal procedures. The electrician must stop
immediately, alert the supervisor/owner, and ensure a qualified abatement team handles
it.
5. What is the maximum permitted fill percentage for a conduit (raceway)
containing three conductors?
A) 40%
B) 50%
C) 60%
D) 75%
,Answer: A
Explanation: NEC Chapter 9, Table 1, indicates that for three or more conductors, the
conduit fill cannot exceed 40% of the raceway's interior cross-sectional area to allow for
heat dissipation and ease of pulling.
6. When working in a damp mechanical room, which safety practice is most critical
for using a portable power drill?
A) Using a double insulated or GFCI-protected drill
B) Wearing cotton gloves
C) Removing the grounding pin for better fit
D) Using an aluminum ladder
Answer: A
Explanation: Damp conditions lower the body's resistance to electric shock. GFCI
protection (or a double-insulated tool) is critical because it will trip the circuit quickly if a
ground fault occurs, potentially saving the user from a fatal shock .
7. A fluorescent lighting fixture fails. The 07 electrician determines the ballast is
bad. What must be true regarding the replacement ballast?
A) It must be the exact same manufacturer as the fixture
B) It must be listed and identified for use in that specific fixture
C) It must be a magnetic ballast because electronic are not allowed for maintenance
D) It must operate at a higher voltage than the original
Answer: B
Explanation: NEC 410.130 and general listing requirements (UL) mandate that
replacement parts, particularly ballasts and drivers, must be suitable for the marked
electrical and mechanical characteristics of the fixture and the lamps used .
8. In a 3-phase wye system, what is the line-to-neutral voltage if the line-to-line
voltage is 480 volts?
A) 120V
B) 208V
C) 240V
, D) 277V
Answer: D
Explanation: In a wye system, Line-to-Neutral voltage = Line-to-Line voltage / √3. 480V
/ 1.73 = approximately 277V. This is common for commercial lighting loads.
9. While performing lockout/tagout (LOTO) on an industrial conveyor, multiple
electricians are working on different parts. How is the lockout applied?
A) The supervisor applies one lock for the whole crew to save time
B) Each electrician applies their own personal lock to the disconnect
C) Only the senior electrician applies a lock, others rely on tags
D) Tags are sufficient since the machine is in sight
Answer: B
Explanation: OSHA and WISHA require each individual employee to apply their own
personal lock and key to the energy isolating device to ensure that no one can re-
energize the equipment while any single person is working on it .
10. What is the ampacity of a 10 AWG THHN copper conductor at 75°C in a dry
location?
A) 30 Amps
B) 35 Amps
C) 40 Amps
D) 50 Amps
Answer: B
Explanation: Per NEC Table 310.16 (formerly 310.15(B)(16)), 10 AWG copper with THHN
insulation at 90°C is rated for 40A, but when terminated on equipment (breakers,
switches) rated for 75°C (common for panels under 100A), the ampacity must be based
on the 75°C column, which is 35A.
11. WAC 296-46B-920(h) specifically restricts 07 electricians from working outside
the luminaire body. What does this imply for an LED retrofit requiring a new driver
box?
A) It is allowed if the driver is listed
