NFPA 70E Arc Flash Risk Assessment Practice Exam
Questions and Correct Answers Updated
1: What is the primary purpose of NFPA 70E?
A. To design electrical systems
B. To provide a workplace standard for electrical safety
C. To replace the NEC
D. To regulate utility companies
CORRECT ANSWER: B. To provide a workplace standard for electrical safety
Rationale: NFPA 70E focuses on employee safety during electrical work, whereas the NEC (NFPA
70) focuses on installation requirements for electrical systems.
2: Who is responsible for performing an Arc Flash Risk Assessment?
A. Any employee
B. A Qualified Person
C. The Safety Manager only
D. The Equipment Manufacturer
CORRECT ANSWER: B. A Qualified Person
Rationale: NFPA 70E requires that an Arc Flash Risk Assessment be performed by a Qualified
Person who has the knowledge and training to identify hazards and determine risks.
3: What is the Arc Flash Boundary?
A. The distance where voltage is zero
B. The distance where incident energy equals 1.2 cal/cm²
C. The distance where shock hazard exists
D. The physical barrier around equipment
CORRECT ANSWER: B. The distance where incident energy equals 1.2 cal/cm²
Rationale: The Arc Flash Boundary is defined as the distance at which the incident energy from
an arc flash equals 1.2 cal/cm², the threshold for a second-degree burn.
4: How often must employees be retrained on NFPA 70E requirements?
A. Every year
B. Every 2 years
,C. Every 3 years
D. Every 5 years
CORRECT ANSWER: C. Every 3 years
Rationale: NFPA 70E requires retraining at least every 3 years, or sooner if changes in the
workplace or job duties occur.
5: What is the first step in the Hierarchy of Risk Controls?
A. PPE
B. Administrative Controls
C. Elimination
D. Engineering Controls
CORRECT ANSWER: C. Elimination
Rationale: The Hierarchy of Risk Controls prioritizes Elimination (de-energizing) as the most
effective method, followed by Substitution, Engineering, Awareness, Administrative, and finally
PPE.
6: When is an Energized Electrical Work Permit required?
A. For all energized work
B. When working on circuits over 50V and justification exists
C. Only for voltages over 600V
D. Never
CORRECT ANSWER: B. When working on circuits over 50V and justification exists
Rationale: An Energized Work Permit is required for energized work on conductors or circuit
parts over 50V unless specific exceptions (like troubleshooting) apply.
7: What does PPE Category 1 typically require?
A. 4 cal/cm² arc rating
B. 8 cal/cm² arc rating
C. 12 cal/cm² arc rating
D. 40 cal/cm² arc rating
CORRECT ANSWER: A. 4 cal/cm² arc rating
Rationale: PPE Category 1 requires a minimum arc rating of 4 cal/cm² for clothing and
equipment.
8: What is the minimum voltage threshold for shock hazard precautions?
,A. 12V
B. 30V
C. 50V
D. 120V
CORRECT ANSWER: C. 50V
Rationale: NFPA 70E establishes 50V AC as the threshold where shock hazards require safety
precautions and qualified personnel.
9: What information must be on an equipment arc flash label?
A. Equipment serial number only
B. Nominal voltage and Arc Flash Boundary
C. Manufacturer name only
D. Date of installation
CORRECT ANSWER: B. Nominal voltage and Arc Flash Boundary
Rationale: Labels must include nominal voltage, arc flash boundary, and at least one of: incident
energy, PPE category, or minimum arc rating of clothing.
10: What is the maximum voltage for using rubber insulating gloves without leather
protectors?
A. They are never used without protectors
B. 1000V
C. 500V
D. 240V
CORRECT ANSWER: A. They are never used without protectors
Rationale: Leather protectors must always be worn over rubber insulating gloves to protect
against physical damage unless specific low-voltage exceptions apply (which are rare in
industrial settings).
11: What is the purpose of an Approach Boundary?
A. To define where PPE is needed
B. To define distances for shock protection
C. To define where tools are stored
D. To define equipment height
CORRECT ANSWER: B. To define distances for shock protection
, Rationale: Approach Boundaries (Limited, Restricted, Prohibited) define distances from exposed
energized parts to protect against shock hazards.
12: Who can cross the Restricted Approach Boundary?
A. Any employee
B. A Qualified Person with appropriate PPE
C. A Manager
D. A Visitor
CORRECT ANSWER: B. A Qualified Person with appropriate PPE
Rationale: Only Qualified Persons wearing appropriate PPE and with a documented plan may
cross the Restricted Approach Boundary.
13: What is the incident energy unit of measurement?
A. Volts
B. Amperes
C. Calories per square centimeter (cal/cm²)
D. Watts
CORRECT ANSWER: C. Calories per square centimeter (cal/cm²)
Rationale: Incident energy is measured in thermal energy per unit area, typically cal/cm².
14: When must equipment be placed in an Electrically Safe Work Condition?
A. Always, unless infeasible or greater hazard
B. Only for voltages over 480V
C. Only during maintenance
D. Never
CORRECT ANSWER: A. Always, unless infeasible or greater hazard
Rationale: De-energizing (Electrically Safe Work Condition) is the primary requirement unless it
creates a greater hazard or is infeasible.
15: What is the minimum arc rating for Category 4 PPE?
A. 8 cal/cm²
B. 20 cal/cm²
C. 40 cal/cm²
D. 100 cal/cm²
CORRECT ANSWER: C. 40 cal/cm²
Questions and Correct Answers Updated
1: What is the primary purpose of NFPA 70E?
A. To design electrical systems
B. To provide a workplace standard for electrical safety
C. To replace the NEC
D. To regulate utility companies
CORRECT ANSWER: B. To provide a workplace standard for electrical safety
Rationale: NFPA 70E focuses on employee safety during electrical work, whereas the NEC (NFPA
70) focuses on installation requirements for electrical systems.
2: Who is responsible for performing an Arc Flash Risk Assessment?
A. Any employee
B. A Qualified Person
C. The Safety Manager only
D. The Equipment Manufacturer
CORRECT ANSWER: B. A Qualified Person
Rationale: NFPA 70E requires that an Arc Flash Risk Assessment be performed by a Qualified
Person who has the knowledge and training to identify hazards and determine risks.
3: What is the Arc Flash Boundary?
A. The distance where voltage is zero
B. The distance where incident energy equals 1.2 cal/cm²
C. The distance where shock hazard exists
D. The physical barrier around equipment
CORRECT ANSWER: B. The distance where incident energy equals 1.2 cal/cm²
Rationale: The Arc Flash Boundary is defined as the distance at which the incident energy from
an arc flash equals 1.2 cal/cm², the threshold for a second-degree burn.
4: How often must employees be retrained on NFPA 70E requirements?
A. Every year
B. Every 2 years
,C. Every 3 years
D. Every 5 years
CORRECT ANSWER: C. Every 3 years
Rationale: NFPA 70E requires retraining at least every 3 years, or sooner if changes in the
workplace or job duties occur.
5: What is the first step in the Hierarchy of Risk Controls?
A. PPE
B. Administrative Controls
C. Elimination
D. Engineering Controls
CORRECT ANSWER: C. Elimination
Rationale: The Hierarchy of Risk Controls prioritizes Elimination (de-energizing) as the most
effective method, followed by Substitution, Engineering, Awareness, Administrative, and finally
PPE.
6: When is an Energized Electrical Work Permit required?
A. For all energized work
B. When working on circuits over 50V and justification exists
C. Only for voltages over 600V
D. Never
CORRECT ANSWER: B. When working on circuits over 50V and justification exists
Rationale: An Energized Work Permit is required for energized work on conductors or circuit
parts over 50V unless specific exceptions (like troubleshooting) apply.
7: What does PPE Category 1 typically require?
A. 4 cal/cm² arc rating
B. 8 cal/cm² arc rating
C. 12 cal/cm² arc rating
D. 40 cal/cm² arc rating
CORRECT ANSWER: A. 4 cal/cm² arc rating
Rationale: PPE Category 1 requires a minimum arc rating of 4 cal/cm² for clothing and
equipment.
8: What is the minimum voltage threshold for shock hazard precautions?
,A. 12V
B. 30V
C. 50V
D. 120V
CORRECT ANSWER: C. 50V
Rationale: NFPA 70E establishes 50V AC as the threshold where shock hazards require safety
precautions and qualified personnel.
9: What information must be on an equipment arc flash label?
A. Equipment serial number only
B. Nominal voltage and Arc Flash Boundary
C. Manufacturer name only
D. Date of installation
CORRECT ANSWER: B. Nominal voltage and Arc Flash Boundary
Rationale: Labels must include nominal voltage, arc flash boundary, and at least one of: incident
energy, PPE category, or minimum arc rating of clothing.
10: What is the maximum voltage for using rubber insulating gloves without leather
protectors?
A. They are never used without protectors
B. 1000V
C. 500V
D. 240V
CORRECT ANSWER: A. They are never used without protectors
Rationale: Leather protectors must always be worn over rubber insulating gloves to protect
against physical damage unless specific low-voltage exceptions apply (which are rare in
industrial settings).
11: What is the purpose of an Approach Boundary?
A. To define where PPE is needed
B. To define distances for shock protection
C. To define where tools are stored
D. To define equipment height
CORRECT ANSWER: B. To define distances for shock protection
, Rationale: Approach Boundaries (Limited, Restricted, Prohibited) define distances from exposed
energized parts to protect against shock hazards.
12: Who can cross the Restricted Approach Boundary?
A. Any employee
B. A Qualified Person with appropriate PPE
C. A Manager
D. A Visitor
CORRECT ANSWER: B. A Qualified Person with appropriate PPE
Rationale: Only Qualified Persons wearing appropriate PPE and with a documented plan may
cross the Restricted Approach Boundary.
13: What is the incident energy unit of measurement?
A. Volts
B. Amperes
C. Calories per square centimeter (cal/cm²)
D. Watts
CORRECT ANSWER: C. Calories per square centimeter (cal/cm²)
Rationale: Incident energy is measured in thermal energy per unit area, typically cal/cm².
14: When must equipment be placed in an Electrically Safe Work Condition?
A. Always, unless infeasible or greater hazard
B. Only for voltages over 480V
C. Only during maintenance
D. Never
CORRECT ANSWER: A. Always, unless infeasible or greater hazard
Rationale: De-energizing (Electrically Safe Work Condition) is the primary requirement unless it
creates a greater hazard or is infeasible.
15: What is the minimum arc rating for Category 4 PPE?
A. 8 cal/cm²
B. 20 cal/cm²
C. 40 cal/cm²
D. 100 cal/cm²
CORRECT ANSWER: C. 40 cal/cm²
