WA Master Electrician 07Nonresidential
Maintenanceination (OLD VERSION)
Exam
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. The ampere rating
does not change the working space depth requirement for this voltage .
,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. Under WAC 296-46B-920(h), an 07A electrician is asked to replace a fluorescent
fixture with an LED retrofit kit. The new kit requires a remote driver mounted
outside the fixture housing. Is this permitted?
A) Yes, if the driver is listed for the fixture
B) No, because work outside the luminaire body is not allowed for 07A
C) Yes, with an electrical permit
D) No, unless a master electrician supervises
Answer: B
Explanation: The 07A Nonresidential Lighting Maintenance scope is limited to the inside
of the luminaire body. Adding a junction box or mounting a driver outside the fixture
constitutes new work or modification beyond the scope of the specialty license .
7. What is the line-to-neutral voltage on a 480Y/277-volt, 3-phase, 4-wire system?
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 .
8. 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 .
9. 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, 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 .
10. What is the purpose of the "Equipment Grounding Conductor" (EGC)?
A) To carry the neutral unbalanced current
B) To provide a low-impedance path for fault current to operate the overcurrent device
C) To reduce voltage drop on long runs
D) To act as a current-carrying conductor for emergency lighting
Answer: B
Explanation: NEC 250.4(A)(5) requires that a low-impedance path (the EGC) be provided
for fault current. This ensures that if a hot wire touches a metal case, a short circuit
occurs, tripping the breaker quickly rather than leaving the case energized .
11. A 07 electrician is asked to replace a 40-gallon electric water heater in an
apartment building (non-residential part). What is the primary concern?
A) The voltage rating of the new heater
B) The size of the branch circuit and overcurrent protection
C) The color of the new heater
D) The water pressure in the building
Answer: B
Maintenanceination (OLD VERSION)
Exam
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. The ampere rating
does not change the working space depth requirement for this voltage .
,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. Under WAC 296-46B-920(h), an 07A electrician is asked to replace a fluorescent
fixture with an LED retrofit kit. The new kit requires a remote driver mounted
outside the fixture housing. Is this permitted?
A) Yes, if the driver is listed for the fixture
B) No, because work outside the luminaire body is not allowed for 07A
C) Yes, with an electrical permit
D) No, unless a master electrician supervises
Answer: B
Explanation: The 07A Nonresidential Lighting Maintenance scope is limited to the inside
of the luminaire body. Adding a junction box or mounting a driver outside the fixture
constitutes new work or modification beyond the scope of the specialty license .
7. What is the line-to-neutral voltage on a 480Y/277-volt, 3-phase, 4-wire system?
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 .
8. 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 .
9. 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, 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 .
10. What is the purpose of the "Equipment Grounding Conductor" (EGC)?
A) To carry the neutral unbalanced current
B) To provide a low-impedance path for fault current to operate the overcurrent device
C) To reduce voltage drop on long runs
D) To act as a current-carrying conductor for emergency lighting
Answer: B
Explanation: NEC 250.4(A)(5) requires that a low-impedance path (the EGC) be provided
for fault current. This ensures that if a hot wire touches a metal case, a short circuit
occurs, tripping the breaker quickly rather than leaving the case energized .
11. A 07 electrician is asked to replace a 40-gallon electric water heater in an
apartment building (non-residential part). What is the primary concern?
A) The voltage rating of the new heater
B) The size of the branch circuit and overcurrent protection
C) The color of the new heater
D) The water pressure in the building
Answer: B
