Page 1 of 168
WA Master Electrician 07 Nonresidential
Maintenance (Old Version) Exam Questions &
Answers VERIFIED SOLUTIONS LATEST UPDATE
THIS YEAR
WA Master Electrician 07 Nonresidential Maintenance (Old Version) Exam –
Questions 1-250
Note: This practice exam is based on the "old version" exam blueprint and Washington State-
specific content. The current exam may have different question distribution and format. The
following questions are drawn from an archived exam preparation document and validated
against the 2006 exam content outline .
QUESTIONS 1-50
1. According to the Washington State amendments to the National Electrical Code, which of
the following best describes the definition of 'Nominal Voltage' as it applies to a 120/240V
single-phase system?
A) The actual measured voltage at the service point under full load.
B) The voltage rating assigned to a circuit that approximates the normal operating voltage,
typically 120V or 240V.
C) The maximum voltage that the system can safely withstand without insulation failure.
D) The voltage measured at the utility transformer secondary under no-load conditions.
,Page 2 of 168
Answer: B) Nominal voltage is a value assigned to a circuit for convenient designation,
approximating the normal operating voltage. WA amendments adopt the NEC definition of
nominal voltage as a value close to the standard system voltage .
2. Under Washington State amendments, a 'Service' is defined as the conductors and
equipment for delivering electric energy from the utility supply system to the wiring system
of the premises served. Which of the following scenarios would NOT be considered part of
the service?
A) The underground conductors from the utility transformer to the meter base.
B) The meter socket and its enclosure.
C) The main disconnect switch located at the service entrance.
D) The branch circuit panelboard supplying lighting and receptacle loads.
,Page 3 of 168
Answer: D) The service includes all conductors and equipment up to and including the service
disconnecting means. The branch circuit panelboard is downstream of the service disconnecting
means and is therefore part of the premises wiring, not the service .
3. A maintenance electrician is inspecting a nonresidential building and finds a metal water
pipe entering the building. According to the Washington State amendments, which of the
following statements about the water pipe as a grounding electrode is correct?
A) The metal water pipe must be supplemented by an additional electrode, such as a ground
rod, regardless of its length in contact with earth.
B) The metal water pipe may serve as the sole grounding electrode if it has at least 10 feet of
buried metal pipe in contact with the earth.
C) The metal water pipe is not permitted as a grounding electrode under any circumstances per
WA amendments.
, Page 4 of 168
D) The metal water pipe must be bonded to the grounding electrode conductor but cannot be
used as a grounding electrode itself.
Answer: A) The NEC and WA amendments require that if a metal water pipe is used as a
grounding electrode, it must be supplemented by an additional electrode per 250.53(D)(2). Even
if the pipe has 10 feet of buried metal, it still requires a supplemental electrode .
4. In the context of Washington State amendments, what is the minimum clearance
requirement for working space about electrical equipment rated 600V or less, where the
equipment is likely to require examination, adjustment, servicing, or maintenance while
energized?
A) 2.5 feet (762 mm) for conditions where the voltage is 150V or less to ground.
B) 3.0 feet (914 mm) for conditions where the nominal voltage is 120V or less.
C) 3.5 feet (1067 mm) for conditions where the nominal voltage is 277V or less.
D) 4.0 feet (1219 mm) for conditions where the nominal voltage is 480V or less.
WA Master Electrician 07 Nonresidential
Maintenance (Old Version) Exam Questions &
Answers VERIFIED SOLUTIONS LATEST UPDATE
THIS YEAR
WA Master Electrician 07 Nonresidential Maintenance (Old Version) Exam –
Questions 1-250
Note: This practice exam is based on the "old version" exam blueprint and Washington State-
specific content. The current exam may have different question distribution and format. The
following questions are drawn from an archived exam preparation document and validated
against the 2006 exam content outline .
QUESTIONS 1-50
1. According to the Washington State amendments to the National Electrical Code, which of
the following best describes the definition of 'Nominal Voltage' as it applies to a 120/240V
single-phase system?
A) The actual measured voltage at the service point under full load.
B) The voltage rating assigned to a circuit that approximates the normal operating voltage,
typically 120V or 240V.
C) The maximum voltage that the system can safely withstand without insulation failure.
D) The voltage measured at the utility transformer secondary under no-load conditions.
,Page 2 of 168
Answer: B) Nominal voltage is a value assigned to a circuit for convenient designation,
approximating the normal operating voltage. WA amendments adopt the NEC definition of
nominal voltage as a value close to the standard system voltage .
2. Under Washington State amendments, a 'Service' is defined as the conductors and
equipment for delivering electric energy from the utility supply system to the wiring system
of the premises served. Which of the following scenarios would NOT be considered part of
the service?
A) The underground conductors from the utility transformer to the meter base.
B) The meter socket and its enclosure.
C) The main disconnect switch located at the service entrance.
D) The branch circuit panelboard supplying lighting and receptacle loads.
,Page 3 of 168
Answer: D) The service includes all conductors and equipment up to and including the service
disconnecting means. The branch circuit panelboard is downstream of the service disconnecting
means and is therefore part of the premises wiring, not the service .
3. A maintenance electrician is inspecting a nonresidential building and finds a metal water
pipe entering the building. According to the Washington State amendments, which of the
following statements about the water pipe as a grounding electrode is correct?
A) The metal water pipe must be supplemented by an additional electrode, such as a ground
rod, regardless of its length in contact with earth.
B) The metal water pipe may serve as the sole grounding electrode if it has at least 10 feet of
buried metal pipe in contact with the earth.
C) The metal water pipe is not permitted as a grounding electrode under any circumstances per
WA amendments.
, Page 4 of 168
D) The metal water pipe must be bonded to the grounding electrode conductor but cannot be
used as a grounding electrode itself.
Answer: A) The NEC and WA amendments require that if a metal water pipe is used as a
grounding electrode, it must be supplemented by an additional electrode per 250.53(D)(2). Even
if the pipe has 10 feet of buried metal, it still requires a supplemental electrode .
4. In the context of Washington State amendments, what is the minimum clearance
requirement for working space about electrical equipment rated 600V or less, where the
equipment is likely to require examination, adjustment, servicing, or maintenance while
energized?
A) 2.5 feet (762 mm) for conditions where the voltage is 150V or less to ground.
B) 3.0 feet (914 mm) for conditions where the nominal voltage is 120V or less.
C) 3.5 feet (1067 mm) for conditions where the nominal voltage is 277V or less.
D) 4.0 feet (1219 mm) for conditions where the nominal voltage is 480V or less.
