NFPA 70E – ELECTRICAL HAZARD SAFETY
EXAM 2026: ULTIMATE STUDY GUIDE | 90
ANSWERED QUESTIONS + PROVEN TIPS &
STRATEGIES FOR SUCCESS
1. An arc flash protection boundary is established to __.
A. Set a safe observation distance for an unqualified person
B. Prevent workers from being burned in the event of an arc flash
C. Determine the placement of the substation
D. Protect equipment from arc destruction
Rationale:
The arc flash boundary defines the distance at which a person could receive a second-
degree burn if an arc flash occurs. NFPA 70E establishes this boundary to protect
workers from thermal injury caused by incident energy. It is calculated based on
system parameters and fault current. This boundary is about human safety, not
equipment protection.
2. Which overvoltage category rating applies to measurements
taken at a service entrance?
A. CAT I
B. CAT II
C. CAT III
D. CAT IV
Rationale:
CAT IV applies to measurements at the source of installation, such as service
entrances and utility connections. These locations are subject to the highest transient
overvoltages. Using CAT IV-rated instruments ensures the meter can safely withstand
severe surges. Lower CAT ratings would present a serious shock or arc hazard.
,3. What color tag identifies a Class 4 rubber glove rated for 36,000
volts?
A. Green
B. Red
C. Orange
D. Yellow
Rationale:
ANSI and ASTM standards assign yellow to Class 4 rubber insulating gloves. Class 4
gloves provide the highest voltage protection, up to 36 kV. Color coding helps quickly
verify glove class in the field. Using the wrong class exposes workers to fatal shock
hazards.
4. If a technician only has a non-contact voltage detector, what
should they do before working on switchgear?
A. Proceed without voltage verification
B. Assume safety if detector shows no voltage
C. Continue using the non-contact detector
D. Obtain a contact-type voltage detector
Rationale:
NFPA 70E requires verification of absence of voltage using an approved contact-
type tester. Non-contact detectors are screening tools and cannot confirm de-
energization. False negatives are possible due to shielding or low voltage levels. Using
a contact meter ensures compliance with safe work practices.
,5. What does CAT stand for in electrical measurement ratings?
A. Current
B. Circuit
C. Category
D. Capacitance
Rationale:
CAT refers to the overvoltage category, which defines the meter’s ability to
withstand transient surges. These categories range from CAT I to CAT IV. Higher CAT
ratings indicate greater protection against impulse voltages. Using the wrong category
exposes users to equipment failure and injury.
6. Which standard conveys workplace electrical safety
requirements?
A. IEC
B. NEMA
C. NFPA 70E
D. NEC
Rationale:
NFPA 70E focuses on electrical safety in the workplace, addressing arc flash,
shock hazards, PPE, and safe work practices. The NEC governs installation, not worker
safety. NFPA 70E bridges OSHA requirements with practical safety controls. Employers
rely on it to reduce electrical injuries.
7. What is an employee responsibility regarding PPE?
A. Inspect PPE monthly
B. Wear PPE only if danger seems likely
C. Modify PPE for better fit
D. Inspect PPE prior to each use
, Rationale:
NFPA 70E requires PPE to be inspected before every use to ensure integrity.
Damage or contamination can compromise protection. Modifying PPE is prohibited
because it voids certification. Daily inspection helps prevent failures during exposure
to electrical hazards.
8. The corresponding color for a Class 4 rubber glove is __.
A. Beige
B. Orange
C. Red
D. Yellow
Rationale:
Class 4 rubber gloves are color-coded yellow under ASTM standards. This visual
identification prevents misuse of lower-rated gloves. Class 4 gloves protect up to
36,000 volts AC. Proper identification is critical when working near high-voltage
systems.
9. What is the primary hazard associated with arc flash incidents?
A. Noise exposure
B. Flying debris
C. Thermal energy release
D. Magnetic force
Rationale:
Arc flashes release intense thermal energy capable of causing severe burns in
milliseconds. Temperatures can exceed 35,000°F. This heat is the leading cause of
fatal electrical injuries. PPE selection is based on resisting this thermal exposure.
EXAM 2026: ULTIMATE STUDY GUIDE | 90
ANSWERED QUESTIONS + PROVEN TIPS &
STRATEGIES FOR SUCCESS
1. An arc flash protection boundary is established to __.
A. Set a safe observation distance for an unqualified person
B. Prevent workers from being burned in the event of an arc flash
C. Determine the placement of the substation
D. Protect equipment from arc destruction
Rationale:
The arc flash boundary defines the distance at which a person could receive a second-
degree burn if an arc flash occurs. NFPA 70E establishes this boundary to protect
workers from thermal injury caused by incident energy. It is calculated based on
system parameters and fault current. This boundary is about human safety, not
equipment protection.
2. Which overvoltage category rating applies to measurements
taken at a service entrance?
A. CAT I
B. CAT II
C. CAT III
D. CAT IV
Rationale:
CAT IV applies to measurements at the source of installation, such as service
entrances and utility connections. These locations are subject to the highest transient
overvoltages. Using CAT IV-rated instruments ensures the meter can safely withstand
severe surges. Lower CAT ratings would present a serious shock or arc hazard.
,3. What color tag identifies a Class 4 rubber glove rated for 36,000
volts?
A. Green
B. Red
C. Orange
D. Yellow
Rationale:
ANSI and ASTM standards assign yellow to Class 4 rubber insulating gloves. Class 4
gloves provide the highest voltage protection, up to 36 kV. Color coding helps quickly
verify glove class in the field. Using the wrong class exposes workers to fatal shock
hazards.
4. If a technician only has a non-contact voltage detector, what
should they do before working on switchgear?
A. Proceed without voltage verification
B. Assume safety if detector shows no voltage
C. Continue using the non-contact detector
D. Obtain a contact-type voltage detector
Rationale:
NFPA 70E requires verification of absence of voltage using an approved contact-
type tester. Non-contact detectors are screening tools and cannot confirm de-
energization. False negatives are possible due to shielding or low voltage levels. Using
a contact meter ensures compliance with safe work practices.
,5. What does CAT stand for in electrical measurement ratings?
A. Current
B. Circuit
C. Category
D. Capacitance
Rationale:
CAT refers to the overvoltage category, which defines the meter’s ability to
withstand transient surges. These categories range from CAT I to CAT IV. Higher CAT
ratings indicate greater protection against impulse voltages. Using the wrong category
exposes users to equipment failure and injury.
6. Which standard conveys workplace electrical safety
requirements?
A. IEC
B. NEMA
C. NFPA 70E
D. NEC
Rationale:
NFPA 70E focuses on electrical safety in the workplace, addressing arc flash,
shock hazards, PPE, and safe work practices. The NEC governs installation, not worker
safety. NFPA 70E bridges OSHA requirements with practical safety controls. Employers
rely on it to reduce electrical injuries.
7. What is an employee responsibility regarding PPE?
A. Inspect PPE monthly
B. Wear PPE only if danger seems likely
C. Modify PPE for better fit
D. Inspect PPE prior to each use
, Rationale:
NFPA 70E requires PPE to be inspected before every use to ensure integrity.
Damage or contamination can compromise protection. Modifying PPE is prohibited
because it voids certification. Daily inspection helps prevent failures during exposure
to electrical hazards.
8. The corresponding color for a Class 4 rubber glove is __.
A. Beige
B. Orange
C. Red
D. Yellow
Rationale:
Class 4 rubber gloves are color-coded yellow under ASTM standards. This visual
identification prevents misuse of lower-rated gloves. Class 4 gloves protect up to
36,000 volts AC. Proper identification is critical when working near high-voltage
systems.
9. What is the primary hazard associated with arc flash incidents?
A. Noise exposure
B. Flying debris
C. Thermal energy release
D. Magnetic force
Rationale:
Arc flashes release intense thermal energy capable of causing severe burns in
milliseconds. Temperatures can exceed 35,000°F. This heat is the leading cause of
fatal electrical injuries. PPE selection is based on resisting this thermal exposure.
