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NETA ETT Level 2 study materials
NETA ETT Level 2 study resources

NETA ETT Level 2 practice questions

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Question 1Electrical Safety and Safe Work Practices

The arc flash boundary is the distance from a prospective arc at which a person without arc-rated PPE could receive an incident energy of approximately:

  1. 1.2 cal/cm² Correct answer.
  2. 4.0 cal/cm²
  3. 0.5 cal/cm²
  4. 8.0 cal/cm²

Explanation

The arc flash boundary is defined as the distance at which incident energy equals 1.2 cal/cm², the level at which a second-degree burn can occur. Any work closer than that boundary requires arc-rated PPE selected for the calculated incident energy.

Question 2Electrical Safety and Safe Work Practices

Under a lockout/tagout program, a personal lock applied to an energy-isolating device is removed by:

  1. any qualified employee who finishes the job
  2. the supervisor of the maintenance crew
  3. the site safety coordinator
  4. the authorized employee who applied it Correct answer.

Explanation

Each authorized employee applies a personal lock and retains the key, so only that employee removes the lock when the work is complete. Removal by anyone else is permitted only through a documented exception procedure with employer verification.

Question 3Electrical Safety and Safe Work Practices

Rubber insulating gloves marked Class 2 have a maximum use voltage of:

  1. 1,000 V AC
  2. 36,000 V AC
  3. 7,500 V AC
  4. 17,000 V AC Correct answer.

Explanation

Rubber insulating gloves are classed by maximum use voltage: Class 00 is 500 V, Class 0 is 1,000 V, Class 1 is 7,500 V, Class 2 is 17,000 V, Class 3 is 26,500 V and Class 4 is 36,000 V. Gloves must be rated at or above the voltage of the circuit being worked.

Question 4Electrical Safety and Safe Work Practices

Which approach boundary may be crossed only by a qualified person using shock-protective equipment suited to the voltage?

  1. Working distance boundary
  2. Limited approach boundary
  3. Arc flash boundary
  4. Restricted approach boundary Correct answer.

Explanation

The restricted approach boundary is the shock-protection line: only qualified persons wearing the appropriate shock-protective equipment may cross it. The limited approach boundary instead controls access by unqualified persons, who must be escorted.

Question 5Electrical Safety and Safe Work Practices

A ground-fault circuit interrupter used for temporary power on a work site is designed to open the circuit at a current imbalance of about:

  1. 100 mA
  2. 30 mA
  3. 5 mA Correct answer.
  4. 500 mA

Explanation

Personnel-protection GFCIs trip at approximately 5 mA (4 to 6 mA) of current imbalance, a level intended to prevent ventricular fibrillation. Higher trip levels are used for equipment protection, not for protecting people.

Question 6Electrical Safety and Safe Work Practices

Before and after using a voltage detector to verify an absence of voltage, the qualified worker should:

  1. confirm it operates on a known live source Correct answer.
  2. clean the probe tips with a dry cloth
  3. set the meter to the highest range
  4. attach a temporary ground to the probe

Explanation

The live-dead-live method requires proving the tester on a known energized source, testing the circuit, then re-proving the tester. This confirms the instrument worked before and after the test and did not fail silently.

Question 7Electrical Safety and Safe Work Practices

A pre-job briefing before energized work should cover the hazards, the work procedure, and:

  1. the name of the utility inspector
  2. the customer's billing arrangement
  3. the protective equipment required Correct answer.
  4. the expected project completion date

Explanation

The job briefing addresses the hazards of the task, the work procedure, special precautions, the energy source controls, and the PPE required. Administrative and scheduling items are outside its safety purpose.

Question 8Electrical Safety and Safe Work Practices

Insulated hand tools used on or near energized parts must be:

  1. rated and marked for the voltage Correct answer.
  2. tested at 10,000 V each day
  3. made of fiberglass with rubber grips
  4. stored in oiled canvas pouches

Explanation

Insulated tools must carry a voltage rating and marking, typically 1,000 V, and must be inspected for damage before use. The rating and marking are what demonstrate suitability for the circuit voltage.

Question 9Electrical Safety and Safe Work Practices

The arc rating of the arc-rated clothing worn for a task must be at least equal to:

  1. the incident energy at the work location Correct answer.
  2. the system voltage divided by 100
  3. the available fault current in kA
  4. the fabric weight in oz/yd²

Explanation

PPE is selected so that the clothing system's arc rating equals or exceeds the incident energy calculated at the worker's location. Voltage, fault current and fabric weight are inputs or descriptors, not the selection criterion.

Question 10Electrical Safety and Safe Work Practices

An energized work permit is normally required when the task involves:

  1. turning off a disconnect at the panel
  2. work inside the restricted approach boundary Correct answer.
  3. testing a receptacle with a handheld meter
  4. installing a lock on a motor starter

Explanation

Energized work requires a permit when justified by increased hazard or infeasibility of de-energizing, and it is mandatory for work within the restricted approach boundary. Routine de-energized tasks and lockout activities do not require one.

Question 11Electrical Safety and Safe Work Practices

When installing temporary protective grounds on a de-energized circuit, the first connection made is:

  1. the conductor clamp at the far end
  2. the clamp to the metal enclosure
  3. the conductor clamp at the work site
  4. the clamp to the station ground bus Correct answer.

Explanation

The ground-end clamp is connected to the established ground first, then the conductor clamp is applied with a live-line tool, and removal is done in reverse order. This order keeps the worker from becoming part of a path if the circuit is accidentally energized.

Question 12Electrical Safety and Safe Work Practices

A test instrument marked CAT III is intended for measurements on:

  1. energized bare conductors outdoors
  2. low-energy electronic circuits only
  3. automotive 12 V starting circuits
  4. fixed distribution installations Correct answer.

Explanation

CAT III instruments are rated for fixed distribution installations such as panelboards and feeder circuits. CAT IV covers the service entrance and outdoor origin, while lower categories cover branch circuits and electronics.

Question 13Electrical Safety and Safe Work Practices

After a capacitor bank is de-energized for maintenance, the capacitors must be:

  1. discharged, grounded and left grounded Correct answer.
  2. measured with a multimeter on the ohms range
  3. covered with an insulating blanket
  4. left to self-discharge for one hour

Explanation

Capacitors can retain a lethal charge after the source is removed, so they must be discharged with a rated device and then grounded, with the ground left in place. Waiting, covering or measuring does not remove the stored energy.

Question 14Electrical Safety and Safe Work Practices

If a downed conductor is energizing the ground near you, the safest way to leave the area is to:

  1. jump and land on both feet
  2. walk heel-to-toe slowly
  3. shuffle with feet close together Correct answer.
  4. run in a straight line away from it

Explanation

Voltage gradients in the earth create step potential between points of contact; shuffling with the feet close together keeps both feet at nearly the same potential. Running or taking long strides increases the voltage difference across the body.

Question 15Electrical Safety and Safe Work Practices

When a worker enters a vault containing exposed energized conductors, the employer must provide:

  1. a written switching order
  2. an attendant stationed at the entrance Correct answer.
  3. a portable fire extinguisher
  4. a second worker inside the vault

Explanation

An attendant must remain outside the vault or manhole to monitor the entrant and summon help, and must not enter to attempt a rescue without the proper equipment. The attendant provides the continuous outside watch that the work requires.

Question 16Electrical Safety and Safe Work Practices

Rubber insulating gloves in service must be electrically retested at intervals not exceeding:

  1. 12 months
  2. 6 months Correct answer.
  3. 24 months
  4. 3 months

Explanation

In-service rubber insulating gloves must be electrically retested every six months, and the test date is tracked so expired gloves are removed from service. Visual inspection and air testing occur far more frequently but do not replace the electrical retest.

Question 17Electrical Safety and Safe Work Practices

Clothing worn as an underlayer beneath arc-rated PPE should be made of:

  1. polyester or nylon blends
  2. any fabric that is flame retardant
  3. acetate or polypropylene
  4. non-melting natural or treated fibers Correct answer.

Explanation

Underlayers must be non-melting, such as cotton, wool or treated fabrics, because meltable fibers can fuse to the skin and worsen burn injury. The arc rating of the layered system must still meet the incident energy.

Question 18Electrical Safety and Safe Work Practices

A rubber insulating glove must be air tested before each use to check for:

  1. correct electrical rating
  2. proper cuff diameter
  3. cuts, punctures and pinholes Correct answer.
  4. expired test date

Explanation

The field air test, rolling the glove cuff to trap air and observing the surface, reveals cuts, punctures and pinholes that could admit current. Rating and test-date checks are separate visual and record checks.

Question 19Electrical Safety and Safe Work Practices

When servicing a large vented lead-acid battery bank, a primary hazard is:

  1. hydrogen gas igniting near a spark Correct answer.
  2. frozen electrolyte in the cells
  3. static discharge damaging the charger
  4. oxygen enrichment causing fire

Explanation

Charging lead-acid cells releases hydrogen, which can form an explosive mixture in the battery room, so ignition sources, smoking and arcing must be excluded and ventilation maintained. Electrolyte also requires eye and skin protection.

Question 20Electrical Safety and Safe Work Practices

Before entering a confined space such as a cable vault, the atmosphere should be:

  1. checked for clarity by flashlight
  2. assumed safe if the space is dry
  3. flushed with oxygen
  4. tested for oxygen and combustibles Correct answer.

Explanation

Confined spaces must be tested for oxygen content, flammable gases and vapors, and toxic contaminants before entry, with continuous monitoring where conditions can change. A dry or apparently clear space can still be oxygen-deficient or contain flammable gas.

Question 21Electrical Safety and Safe Work Practices

For a fixed arcing current and gap, increasing the distance between the worker and the arc:

  1. leaves incident energy unchanged
  2. increases incident energy at the worker
  3. reduces incident energy at the worker Correct answer.
  4. increases only the arc blast pressure

Explanation

Incident energy falls off as the worker moves farther from the arc, and the distance exponent in the calculation reflects this reduction. Increasing working distance is therefore a recognized way to lower exposure when the equipment design permits.

Question 22Electrical Safety and Safe Work Practices

For equipment in the 15.1 kV to 36 kV range, the restricted approach boundary is:

  1. 2 ft 2 in Correct answer.
  2. 5 ft 0 in
  3. 1 ft 0 in
  4. 10 ft 0 in

Explanation

The restricted approach boundary for 15.1 kV through 36 kV is 2 ft 2 in, the shock-protection line for qualified workers with appropriate equipment. The larger values in the tables apply to the limited approach boundary, which differs for fixed and movable conductors.

Question 23Electrical Safety and Safe Work Practices

A temporary protective ground jumper must be capable of carrying:

  1. the available fault current until clearing Correct answer.
  2. half the rated ampacity of the cable
  3. the battery charger's output current
  4. the circuit's normal continuous load current

Explanation

Ground jumpers must withstand the available fault current for the time the protective devices take to clear the fault, and they are selected from tables for that duty. Normal load current is irrelevant because the grounds are installed on a de-energized circuit.

Question 24Electrical Safety and Safe Work Practices

Flame-resistant clothing that is not arc rated is generally:

  1. preferred because it is lighter weight
  2. not sufficient against incident energy Correct answer.
  3. acceptable as the only PPE for arc flash
  4. equivalent to arc-rated clothing when new

Explanation

Only arc-rated clothing has a demonstrated arc rating (ATPV or energy breakopen threshold) that can be compared with incident energy. Flame-resistant clothing without an arc rating gives no assurance that it will not break open under arc exposure.

Question 25Electrical Safety and Safe Work Practices

After isolation and lockout, stored energy in springs, hydraulics and capacitors must be:

  1. documented in the switching log
  2. left as found until startup
  3. relieved, restrained and verified Correct answer.
  4. checked only if the load moves

Explanation

A complete zero-energy state requires that all forms of stored energy be relieved, restrained or blocked, and then verified before work begins. Documentation and waiting for movement do not establish that the energy has been controlled.

Question 26Electrical Safety and Safe Work Practices

Under a lockout/tagout program, who is authorized to remove a personal lock from an energy-isolating device?

  1. The maintenance planner
  2. The site safety supervisor
  3. The worker who applied the lock Correct answer.
  4. Any qualified worker on the crew

Explanation

A personal lock may be removed only by the person who applied it. If that person is unavailable, removal must follow the employer's documented procedure with verification of the worker's safety.

Question 27Electrical Safety and Safe Work Practices

Arc-rated clothing must be marked with which of the following ratings?

  1. A flame spread rating only
  2. An arc rating in cal/cm2 Correct answer.
  3. A dielectric test voltage
  4. A cut resistance level

Explanation

Arc-rated clothing is labeled with an arc rating expressed in cal/cm2, which indicates the incident energy it can withstand without causing a second-degree burn. A flame spread rating alone does not establish arc flash protection.

Question 28Electrical Safety and Safe Work Practices

The limited approach boundary is the distance at which:

  1. Arc-rated PPE must be worn by all workers
  2. Direct contact with live parts is allowed
  3. An unqualified person must be escorted Correct answer.
  4. Only a qualified person may work unescorted

Explanation

The limited approach boundary defines where an unqualified person must be escorted by a qualified person. It is not the boundary for direct contact or automatic arc-rated PPE use.

Question 29Electrical Safety and Safe Work Practices

Temporary receptacles used for maintenance work must be protected by:

  1. GFCI protection Correct answer.
  2. A lockout device
  3. A surge arrester
  4. An isolation transformer

Explanation

Temporary receptacles used for maintenance and construction activities must have ground-fault circuit interrupter protection. A GFCI trips at a low current level to reduce shock hazard.

Question 30Electrical Safety and Safe Work Practices

Which portable ladder is acceptable for use near exposed energized conductors?

  1. Fiberglass Correct answer.
  2. Metal with rubber feet
  3. Aluminum
  4. Steel

Explanation

A fiberglass ladder is nonconductive and is the appropriate choice near exposed energized conductors. Metal ladders can provide a conductive path and should not be used for this work.

Question 31Electrical Safety and Safe Work Practices

If a coworker is being shocked and is still in contact with an energized conductor, the first action should be to:

  1. Spray the area with water
  2. De-energize the circuit Correct answer.
  3. Pull the coworker away by the arm
  4. Wait for the coworker to release

Explanation

The source should be de-energized or isolated before anyone touches the victim. Pulling the victim or waiting can expose the rescuer to the same electrical hazard.

Question 32Electrical Safety and Safe Work Practices

Vented lead-acid batteries can release which gas during charging?

  1. Nitrogen
  2. Carbon monoxide
  3. Sulfur dioxide
  4. Hydrogen Correct answer.

Explanation

Charging a vented lead-acid battery electrolyzes water and produces hydrogen gas, which can form an explosive mixture in air. The area must be ventilated and ignition sources controlled.

Question 33Electrical Safety and Safe Work Practices

Before entry into a confined space, the oxygen concentration should be within:

  1. 19.5% to 23.5% Correct answer.
  2. 15% to 19%
  3. 23.5% to 30%
  4. 10% to 15%

Explanation

A safe oxygen level for confined space entry is generally between 19.5% and 23.5%. Levels below this range are oxygen-deficient, and levels above increase fire risk.

Question 34Electrical Safety and Safe Work Practices

A lockout device must be capable of:

  1. Releasing stored hydraulic pressure
  2. Holding the isolator in safe position Correct answer.
  3. Measuring voltage at the load terminals
  4. Serving as a personal warning tag

Explanation

A lockout device physically holds an energy-isolating device in the safe or off position. Tags provide warning but do not physically prevent operation.

Question 35Electrical Safety and Safe Work Practices

For a fixed working distance and arcing current, incident energy increases when:

  1. The worker wears arc-rated clothing
  2. The system voltage decreases
  3. The clearing time increases Correct answer.
  4. The gap between electrodes decreases

Explanation

Incident energy is a function of arcing current and duration, so a longer protective device clearing time exposes the worker to more energy. Arc-rated clothing limits injury but does not change the incident energy produced by the arc.

Question 36Electrical Safety and Safe Work Practices

For equipment operating at 1 kV to 15 kV, the restricted approach boundary is:

  1. 5 ft
  2. 7 in
  3. 2 ft 2 in Correct answer.
  4. 1 ft 5 in

Explanation

The restricted approach boundary for 1 kV to 15 kV equipment is 2 ft 2 in. This boundary requires qualified workers and appropriate shock protection measures.

Question 37Electrical Safety and Safe Work Practices

Temporary protective ground jumpers must be sized to carry:

  1. The available fault current for 1 second
  2. The normal load current only
  3. Fault current until the device clears Correct answer.
  4. The capacitor discharge current only

Explanation

Temporary protective grounds must withstand the maximum available fault current for the time needed for the protective device to clear the fault. They must also be rated and installed as a grounding set.

Question 38Electrical Safety and Safe Work Practices

Flame-resistant clothing that is not arc rated is:

  1. Not acceptable as arc PPE Correct answer.
  2. Rated by incident energy
  3. Acceptable if worn over cotton
  4. Equivalent to arc-rated clothing

Explanation

Flame-resistant clothing without an arc rating has not been evaluated for arc flash exposure and cannot be used as arc flash PPE. Arc-rated clothing must carry an arc rating in cal/cm2.

Question 39Electrical Safety and Safe Work Practices

After isolation and lockout, stored energy in springs and hydraulic systems must be:

  1. Relieved or restrained Correct answer.
  2. Left in place for testing
  3. Tagged and left energized
  4. Verified by the operator only

Explanation

Stored mechanical and hydraulic energy must be relieved, blocked, or restrained before work begins. Verification by the operator alone is not sufficient; the energy must be physically controlled.

Question 40Electrical Safety and Safe Work Practices

Rubber insulating sleeves in service must be electrically retested at intervals not exceeding:

  1. 24 months
  2. 6 months
  3. 12 months Correct answer.
  4. 3 months

Explanation

Rubber insulating sleeves in service are retested at intervals not exceeding 12 months. Rubber insulating gloves have a shorter retest interval of 6 months.

Question 41Electrical Safety and Safe Work Practices

A test instrument marked CAT IV is intended for measurements at:

  1. Panelboard feeders
  2. Receptacle branch circuits
  3. Fixed wiring remote from service
  4. The service entrance origin Correct answer.

Explanation

CAT IV instruments are rated for measurements at the origin of the installation, such as the service entrance or service drop. CAT II and CAT III ratings apply farther downstream.

Question 42Electrical Safety and Safe Work Practices

An arc flash label typically includes the incident energy and the:

  1. Arc flash boundary Correct answer.
  2. Battery backup time
  3. Ground resistance limit
  4. Insulation resistance value

Explanation

Arc flash labels commonly state the incident energy and the arc flash boundary, along with the required PPE category or arc rating. Insulation resistance, battery time, and ground resistance are unrelated to the arc flash label.

Question 43Electrical Safety and Safe Work Practices

Insulating blankets used for electrical protection must be:

  1. Used only as a mechanical barrier
  2. Stored in contact with oil and grease
  3. Voltage-rated and inspected before use Correct answer.
  4. Tested with an ohmmeter before each use

Explanation

Insulating blankets must be rated for the voltage involved and inspected for damage before each use. They are electrical protective equipment, not merely mechanical barriers.

Question 44Electrical Safety and Safe Work Practices

A rescuer should not touch a victim in contact with energized equipment until:

  1. The circuit is de-energized Correct answer.
  2. The victim calls for help
  3. The rescuer wears leather gloves
  4. The rescuer stands on a wooden pallet

Explanation

The circuit must be de-energized, or the victim must be removed with an insulating tool, before contact is made. Leather gloves and a wooden pallet do not provide reliable electrical protection.

Question 45Electrical Safety and Safe Work Practices

Equipotential grounding is used to:

  1. Keep worker and equipment at equal potential Correct answer.
  2. Increase the fault current to trip faster
  3. Eliminate the need for lockout
  4. Provide a low-resistance path to earth only

Explanation

Equipotential grounding bonds the worker's location and the equipment so that both are at nearly the same potential. This minimizes voltage differences across the worker during a fault.

Question 46Electrical Safety and Safe Work Practices

When available fault current increases, the arc flash boundary generally:

  1. Becomes zero
  2. Decreases
  3. Increases Correct answer.
  4. Stays unchanged

Explanation

Higher available fault current generally produces greater incident energy, which expands the distance at which a person could receive a second-degree burn. The arc flash boundary therefore increases.

Question 47Electrical Safety and Safe Work Practices

Work inside the prohibited approach boundary is permitted only when:

  1. The equipment is rated at less than 1 kV
  2. An unqualified person provides a safety spotter
  3. The task is completed in less than 5 minutes
  4. A qualified worker uses contact PPE under permit Correct answer.

Explanation

The prohibited approach boundary is treated like direct contact with energized parts. Work inside it requires a qualified worker, appropriate contact-rated PPE, and an energized work permit.

Question 48Electrical Safety and Safe Work Practices

Temporary protective grounds should be installed:

  1. At the worksite near the workers Correct answer.
  2. Only after the worker touches the conductor
  3. At the nearest substation only
  4. On the load side away from the worksite

Explanation

Temporary protective grounds should be placed at the worksite, as close as practicable to the workers, so the protected zone covers the work area. Grounds installed only at a remote substation may not protect against all backfeed or induced sources.

Question 49Electrical Safety and Safe Work Practices

When working on a large battery bank, metal tools should be:

  1. Rested on top of the battery cells
  2. Used freely because batteries are low voltage
  3. Stored in a pocket
  4. Insulated or removed to avoid shorts Correct answer.

Explanation

Metal tools can bridge battery terminals and cause severe arcing, burns, and explosion. They should be insulated or kept away from the cells during battery work.

Question 50Electrical Safety and Safe Work Practices

Atmospheric monitoring in a confined space should be:

  1. Performed only before entry
  2. Performed only after work begins
  3. Continuously while occupied Correct answer.
  4. Replaced by a smell test

Explanation

Atmospheric conditions can change while work is in progress, so monitoring should be continuous while the space is occupied. A single pre-entry test does not detect later oxygen deficiency or gas accumulation.