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BASIC NEC 2023

Electrical Safety & Arc Flash Awareness Practice Test

Free online electrical safety and arc flash awareness practice test. 25 basic electrical questions on lockout/tagout, PPE, arc flash boundaries, GFCI/AFCI protection, and safe work practices. Good for electrician exam prep.

TOPICS COVERED

Lockout/Tagout Purpose Who Removes a LOTO Lock PPE as Last Defense Arc Flash Definition Arc Flash Boundary Arc Flash vs Arc Blast

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Safety questions show up throughout electrician exams, and the ideas here matter on the job, not just on paper. Always assume equipment is energized until you've tested and proven it is not. Lockout/Tagout (LOTO) prevents equipment from being turned back on while someone is working on it. PPE is the LAST line of defense — de-energizing the equipment always comes first when possible. Know the difference between an arc flash (heat and light) and an arc blast (the pressure wave), and between a GFCI (protects people from shock) and an AFCI (protects against arcing fires).

25

Questions

38 min

Time

80%

Pass

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Electrical Safety & Arc Flash Awareness Practice Test — Question List

Question 1: The main purpose of Lockout/Tagout (LOTO) procedures is to:

Prevent equipment from being unexpectedly re-energized while someone is working on it
Speed up how quickly a job can be finished
Replace the need for any personal protective equipment
Reduce the amount of paperwork required for a job

Question 2: In a proper Lockout/Tagout procedure, a lock should only be removed by:

The person who applied it
Any available coworker
The site supervisor, at any time
Whoever needs the equipment turned back on soonest

Question 3: According to standard safety practice, personal protective equipment (PPE) should be considered:

The last line of defense, used after de-energizing whenever possible
The first and only step needed before any electrical work
Optional, as long as the worker is experienced
A replacement for de-energizing equipment

Question 4: An arc flash is best described as:

A dangerous release of heat and light energy caused by a fault current flowing through the air between conductors
A slow, gradual increase in circuit voltage
A harmless static discharge
A planned test of a circuit breaker

Question 5: The "arc flash boundary" is the distance at which:

A person could receive a second-degree burn if an arc flash were to occur
A GFCI is guaranteed to trip
All circuit breakers automatically open
PPE is no longer required

Question 6: The difference between "arc flash" and "arc blast" is that arc blast refers to:

The pressure wave and flying debris produced by the explosive release of energy
A quieter, less dangerous version of an arc flash
A type of planned maintenance test
A term with no real difference from arc flash

Question 7: Approach boundaries around energized equipment (such as the limited approach and restricted approach boundaries) exist to:

Define distances at which increasing levels of protection and qualification are required
Mark the exact spot where a fault occurred in the past
Indicate where tools may be stored on site
Show where a fire extinguisher must be placed

Question 8: An arc-rated PPE garment's "arc rating," expressed in cal/cm², indicates:

The amount of incident energy the garment can withstand before it would cause a burn
The weight of the garment in kilograms
The number of times the garment can be washed
The color coding used for size

Question 9: Before working on or near energized electrical equipment, jewelry and metal watches should be removed because they:

Can conduct electricity and cause severe burns or shock
Are always required by the NEC to be worn
Improve grip on insulated tools
Have no effect on electrical safety

Question 10: The severity of an electric shock to the human body depends mainly on:

The amount of current, the path it takes through the body, and how long it lasts
Only the color of the conductor insulation
Only the brand of the equipment involved
Only the time of day the shock occurs

Question 11: "Let-go current" refers to the current level at which:

A person can no longer voluntarily release their grip on an energized conductor
A circuit breaker automatically resets
A GFCI can no longer function
A conductor becomes cool to the touch

Question 12: A Ground-Fault Circuit Interrupter (GFCI) is designed primarily to protect:

People from electric shock
Wiring from overcurrent damage only
Equipment from arcing faults and fire
Transformers from voltage surges

Question 13: A GFCI differs from a standard circuit breaker in that a GFCI:

Trips when it senses an imbalance between outgoing and returning current, typically around 4-6 mA
Only trips when the current exceeds 100 amps
Never trips under any condition
Only works on 240 V circuits

Question 14: An Arc-Fault Circuit Interrupter (AFCI) is designed primarily to:

Detect dangerous arcing conditions in wiring and prevent electrical fires
Protect people from shock the same way a GFCI does
Measure insulation resistance automatically
Regulate voltage on a circuit

Question 15: When approaching any electrical equipment whose status is unknown, the safest assumption to make is:

The equipment is energized until proven otherwise by testing
The equipment is safe if the room lights are off
The equipment is safe if it looks old
The equipment is safe as long as no one is nearby

Question 16: Insulated rubber gloves used for electrical work must be:

Rated for the voltage being worked on and tested/inspected before each use
Made of any material, as long as they fit comfortably
Only inspected once per year regardless of use
Optional if the worker has years of experience

Question 17: Insulated hand tools are used by electricians mainly to:

Reduce the risk of shock if the tool accidentally contacts an energized part
Make the tool lighter to carry
Improve the tool's cutting sharpness
Eliminate the need for any other PPE

Question 18: Under NFPA 70E, a "qualified person" is someone who:

Has the skills and knowledge related to the equipment and has been trained to recognize and avoid the hazards
Has worked at the company for more than five years
Owns their own set of hand tools
Has a valid driver's license

Question 19: An energized work permit is generally required before working on energized equipment UNLESS:

De-energizing would introduce additional hazards, or is infeasible due to equipment design or operational limitations
The worker simply prefers not to fill out paperwork
The job is expected to take less than five minutes
The equipment is rated below 50 volts

Question 20: As the voltage of energized equipment increases, the minimum safe approach distance for unqualified persons generally:

Increases
Decreases
Stays exactly the same at every voltage
Drops to zero

Question 21: Which current path through the body is generally considered the most dangerous?

Hand to hand, or hand to foot, because the path crosses the heart
Fingertip to fingertip on the same hand
Elbow to shoulder on the same arm
There is no meaningful difference between current paths

Question 22: Water increases the danger of electric shock mainly because it:

Lowers the electrical resistance of the skin, allowing more current to flow through the body
Increases the resistance of the skin, blocking current
Has no effect on the human body's resistance
Converts AC current into DC current

Question 23: Before each use, PPE such as insulated gloves and blankets should be:

Visually inspected for damage and checked that their rating and test date are still valid
Stored away and never inspected once issued
Inspected only if visibly torn
Replaced only after a documented injury occurs

Question 24: For fighting an electrical fire, the correct fire extinguisher class is generally:

Class C
Class A only
Class B only
Water-based extinguishers are best

Question 25: You see a coworker who appears to be in contact with an energized conductor and cannot let go. What should you do FIRST?

De-energize the source if possible, or use a non-conductive object to separate them from the source — do not touch them directly
Grab them with your bare hands and pull them away immediately
Pour water on them to cool the contact point
Wait for them to let go on their own before doing anything

EXAM CARD BASIC

Questions25

Time limit38 min

Pass score80%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)