NFPA 70E ELECTRICAL SAFETY IN THE
WORKPLACE PRACTICE EXAMINATION |
COMPREHENSIVE TEST BANK WITH VERIFIED
ANSWERS & DETAILED RATIONALES | IDEAL FOR
ELECTRICAL ENGINEERING, ELECTRICAL
TECHNOLOGY, OCCUPATIONAL SAFETY,
INDUSTRIAL MAINTENANCE & ELECTRICIAN
CERTIFICATION CANDIDATES (2026–2027 EDITION)
NEWEST UPDATE A+ GUARANTEED.
1. The primary purpose of NFPA 70E is to provide:
a) Installation requirements for electrical equipment
b) A practical safe working area for employees relative to the hazards arising
from the use of electricity
c) Design specifications for electrical systems
d) Guidance for building officials on electrical permits
b) A practical safe working area for employees relative to the hazards
arising from the use of electricity
Rationale: NFPA 70E addresses electrical safety-related work practices to
protect personnel from shock, arc flash, and other electrical hazards.
2. An "electrically safe work condition" is defined as a state in which an
electrical conductor or circuit part has been:
a) Disconnected from all sources of supply, locked out, and verified to be
de-energized
b) De-energized but not locked out
c) Tested for voltage only
d) Insulated but not isolated
a) Disconnected from all sources of supply, locked out, and verified to be
de-energized
, Rationale: NFPA 70E requires establishing an electrically safe work condition
through lockout/tagout, testing, and verification before work begins on
exposed conductors.
3. Which of the following is NOT typically required to establish an electrically
safe work condition?
a) Determine all possible sources of electrical supply
b) Open disconnecting devices and secure them
c) Apply temporary protective grounding equipment where necessary
d) Obtain an energized electrical work permit
d) Obtain an energized electrical work permit
Rationale: An energized electrical work permit is required when work will be
performed on energized parts, not for establishing an electrically safe
condition.
4. The limited approach boundary for a 480-volt, 3-phase circuit breaker with
exposed energized parts is:
a) 1 foot (0.3 m)
b) 3 feet 6 inches (1.0 m)
c) 5 feet (1.5 m)
d) 10 feet (3.0 m)
b) 3 feet 6 inches (1.0 m)
Rationale: Table 130.4(E)(a) specifies the limited approach boundary for
480V (phase-to-phase) as 3 ft 6 in. for exposed movable conductors and 3 ft
6 in. for fixed circuit parts. Actually, for 480V fixed circuit part, limited
approach is 3 ft 6 in.
5. The restricted approach boundary is the distance from an exposed
energized part within which there is an increased risk of shock due to:
a) Arc flash
b) Electrical arc-over combined with inadvertent movement
c) Overheating
d) Magnetic fields
b) Electrical arc-over combined with inadvertent movement
, Rationale: The restricted approach boundary considers the possibility of
accidental contact by a person reaching, falling, or moving toward the
energized part.
6. The arc flash boundary is the distance from an arc source at which the
incident energy equals:
a) 1.0 cal/cm²
b) 1.2 cal/cm²
c) 5.0 cal/cm²
d) 40 cal/cm²
b) 1.2 cal/cm²
Rationale: NFPA 70E defines the arc flash boundary as the distance at which
the incident energy is 1.2 cal/cm², the threshold for a second-degree burn.
7. A "qualified person" is one who:
a) Has a college degree in electrical engineering
b) Has demonstrated skills and knowledge related to the construction and
operation of electrical equipment and has received safety training to
identify and avoid the hazards involved
c) Is licensed as a professional engineer
d) Has at least 10 years of experience in the trade
b) Has demonstrated skills and knowledge related to the construction and
operation of electrical equipment and has received safety training to
identify and avoid the hazards involved
Rationale: NFPA 70E defines a qualified person based on training,
experience, and the ability to recognize and avoid electrical hazards specific
to the equipment.
8. An "unqualified person" may:
a) Work on exposed energized conductors
b) Enter the limited approach boundary only if escorted by a qualified
person and wearing appropriate PPE
c) Perform voltage testing
d) Rack circuit breakers
, b) Enter the limited approach boundary only if escorted by a qualified
person and wearing appropriate PPE
Rationale: Unqualified persons must stay outside the limited approach
boundary unless escorted and protected by a qualified person.
9. An "energized electrical work permit" must be completed and authorized
before:
a) Any electrical work is performed
b) Work is performed within the limited approach boundary of exposed
energized conductors
c) De-energized work is performed
d) Routine visual inspections are conducted
b) Work is performed within the limited approach boundary of exposed
energized conductors
Rationale: The permit documents the justification for working energized, the
shock and arc flash risk assessments, and the required PPE and procedures.
10.Which of the following is an acceptable reason to perform energized
electrical work?
a) It saves time
b) The employer wants to avoid downtime
c) De-energizing would create a greater hazard (e.g., life support systems)
d) The qualified person prefers it
c) De-energizing would create a greater hazard (e.g., life support systems)
Rationale: NFPA 70E allows energized work only when de-energizing is
infeasible or creates a greater hazard, not for convenience or cost savings.
11.The "incident energy" from an arc flash is measured in:
a) Volts
b) Amperes
c) Calories per square centimeter (cal/cm²)
d) Ohms
c) Calories per square centimeter (cal/cm²)
WORKPLACE PRACTICE EXAMINATION |
COMPREHENSIVE TEST BANK WITH VERIFIED
ANSWERS & DETAILED RATIONALES | IDEAL FOR
ELECTRICAL ENGINEERING, ELECTRICAL
TECHNOLOGY, OCCUPATIONAL SAFETY,
INDUSTRIAL MAINTENANCE & ELECTRICIAN
CERTIFICATION CANDIDATES (2026–2027 EDITION)
NEWEST UPDATE A+ GUARANTEED.
1. The primary purpose of NFPA 70E is to provide:
a) Installation requirements for electrical equipment
b) A practical safe working area for employees relative to the hazards arising
from the use of electricity
c) Design specifications for electrical systems
d) Guidance for building officials on electrical permits
b) A practical safe working area for employees relative to the hazards
arising from the use of electricity
Rationale: NFPA 70E addresses electrical safety-related work practices to
protect personnel from shock, arc flash, and other electrical hazards.
2. An "electrically safe work condition" is defined as a state in which an
electrical conductor or circuit part has been:
a) Disconnected from all sources of supply, locked out, and verified to be
de-energized
b) De-energized but not locked out
c) Tested for voltage only
d) Insulated but not isolated
a) Disconnected from all sources of supply, locked out, and verified to be
de-energized
, Rationale: NFPA 70E requires establishing an electrically safe work condition
through lockout/tagout, testing, and verification before work begins on
exposed conductors.
3. Which of the following is NOT typically required to establish an electrically
safe work condition?
a) Determine all possible sources of electrical supply
b) Open disconnecting devices and secure them
c) Apply temporary protective grounding equipment where necessary
d) Obtain an energized electrical work permit
d) Obtain an energized electrical work permit
Rationale: An energized electrical work permit is required when work will be
performed on energized parts, not for establishing an electrically safe
condition.
4. The limited approach boundary for a 480-volt, 3-phase circuit breaker with
exposed energized parts is:
a) 1 foot (0.3 m)
b) 3 feet 6 inches (1.0 m)
c) 5 feet (1.5 m)
d) 10 feet (3.0 m)
b) 3 feet 6 inches (1.0 m)
Rationale: Table 130.4(E)(a) specifies the limited approach boundary for
480V (phase-to-phase) as 3 ft 6 in. for exposed movable conductors and 3 ft
6 in. for fixed circuit parts. Actually, for 480V fixed circuit part, limited
approach is 3 ft 6 in.
5. The restricted approach boundary is the distance from an exposed
energized part within which there is an increased risk of shock due to:
a) Arc flash
b) Electrical arc-over combined with inadvertent movement
c) Overheating
d) Magnetic fields
b) Electrical arc-over combined with inadvertent movement
, Rationale: The restricted approach boundary considers the possibility of
accidental contact by a person reaching, falling, or moving toward the
energized part.
6. The arc flash boundary is the distance from an arc source at which the
incident energy equals:
a) 1.0 cal/cm²
b) 1.2 cal/cm²
c) 5.0 cal/cm²
d) 40 cal/cm²
b) 1.2 cal/cm²
Rationale: NFPA 70E defines the arc flash boundary as the distance at which
the incident energy is 1.2 cal/cm², the threshold for a second-degree burn.
7. A "qualified person" is one who:
a) Has a college degree in electrical engineering
b) Has demonstrated skills and knowledge related to the construction and
operation of electrical equipment and has received safety training to
identify and avoid the hazards involved
c) Is licensed as a professional engineer
d) Has at least 10 years of experience in the trade
b) Has demonstrated skills and knowledge related to the construction and
operation of electrical equipment and has received safety training to
identify and avoid the hazards involved
Rationale: NFPA 70E defines a qualified person based on training,
experience, and the ability to recognize and avoid electrical hazards specific
to the equipment.
8. An "unqualified person" may:
a) Work on exposed energized conductors
b) Enter the limited approach boundary only if escorted by a qualified
person and wearing appropriate PPE
c) Perform voltage testing
d) Rack circuit breakers
, b) Enter the limited approach boundary only if escorted by a qualified
person and wearing appropriate PPE
Rationale: Unqualified persons must stay outside the limited approach
boundary unless escorted and protected by a qualified person.
9. An "energized electrical work permit" must be completed and authorized
before:
a) Any electrical work is performed
b) Work is performed within the limited approach boundary of exposed
energized conductors
c) De-energized work is performed
d) Routine visual inspections are conducted
b) Work is performed within the limited approach boundary of exposed
energized conductors
Rationale: The permit documents the justification for working energized, the
shock and arc flash risk assessments, and the required PPE and procedures.
10.Which of the following is an acceptable reason to perform energized
electrical work?
a) It saves time
b) The employer wants to avoid downtime
c) De-energizing would create a greater hazard (e.g., life support systems)
d) The qualified person prefers it
c) De-energizing would create a greater hazard (e.g., life support systems)
Rationale: NFPA 70E allows energized work only when de-energizing is
infeasible or creates a greater hazard, not for convenience or cost savings.
11.The "incident energy" from an arc flash is measured in:
a) Volts
b) Amperes
c) Calories per square centimeter (cal/cm²)
d) Ohms
c) Calories per square centimeter (cal/cm²)
