NETA 3 COMPREHENSIVE EXAM 2026 QUESTIONS AND
SOLUTIONS RATED A+
✔✔R rated fuses are used for: - ✔✔Protection for motors
R-rated fuses provide required short-circuit protection for medium voltage motors, motor
controllers and associated circuitry. Relays provide both overload protection and locked
rotor protection to the motor.
✔✔Which of the following would be a factor in choosing between 100%, 133%, and
173% Medium voltage cable for a power system? - ✔✔Ground Fault protection
✔✔During the performance of a thermographic scan of similar components within the
switchboard that are under similar load, at what temperature difference does NETA
recommend investigation? - ✔✔1-3 deg C
✔✔In calculating the thickness of insulators for high-voltage AC power lines, which type
of measurement is the best to use for voltage? - ✔✔Peak
✔✔What type of sensing element can measure a transformer's hottest-spot (winding)
temperature directly? - ✔✔Fiber optic cable
✔✔Before acceptance testing begins, what steps should be taken as part of the
commissioning process? - ✔✔Inspect devices for variations from design specifications
✔✔Which of the following would not significantly reduce ground resistance? -
✔✔Increased ground rod diameter
✔✔In a typical stepped distance protection scheme, Zone 4 is used as a backup for an
adjacent transmission line in the reverse direction in case the protection in that line fails.
This zone is usually set to _____ of the adjacent line. - ✔✔20-50%
✔✔The power factor of SF6 circuit breaker bushings is to be within _____ percent of
nameplate per NETA-ATS. - ✔✔10%
✔✔Two 5H inductors connected in series are subjected to an electric current that
changes at a rate of 4.5 amps per second. How much voltage will be dropped across
the series combination? - ✔✔45.00
V = L(di/dt)
Be aware of "Two 5H inductors" - Inductors Add
✔✔Hard hats suitable for the performance of low voltage electrical work, but NOT for
higher voltage electrical work, are identified as being: - ✔✔Class G
,✔✔Which of the following would NOT be part of the test plan for a 21 device? -
✔✔Determine pickup frequency
✔✔Confined space attendants may be assigned to monitor more than one permit
space. - ✔✔True
✔✔Which of the following conditions produces ferroresonance? - ✔✔XC = XL
✔✔Cell internal ohmic values (resistance, impedance or conductance) should not vary
by more than _____ between identical cells that are in a fully charged state. - ✔✔25
percent
✔✔An interfacial tension test value indicates the_______. - ✔✔Attraction between
water and oil
✔✔What is the maximum allowable water content for FR3 insulating liquid received in
new equipment? - ✔✔25 ppm
✔✔Which type of fiber optic cable is specifically designed for harsh outdoor
environments? - ✔✔loose-tube
✔✔According to ANSI/NETA MTS, how often should a medium voltage switchgear with
a high reliability requirement in good condition be electrically tested and maintained? -
✔✔18 months
✔✔How often do you need to update your NFPA 70E lock out/tag out training? -
✔✔every 3 years
✔✔Which of the following statements is true according to the NEC definition of a
switchboard? - ✔✔Switchboards may be accessible from the front or from the rear.
✔✔In a typical stepped distance protection scheme, Zone 3 is set to overreach to an
adjacent transmission line as a backup in case Zone 2 in that line fails. This zone is
commonly set to _____, assuming the impedance of both lines are the same. -
✔✔220%
✔✔A typical value for insulation power factor tests (CHL) of a large dry-type power
transformer is ____ percent or less. - ✔✔2.0
✔✔As an industry standard, IEEE recommends that LTC services be performed how
often? - ✔✔every three to five years
, ✔✔Which of these formulas would be most appropriate for a Field DC Acceptance test
on rotating equipment insulation? - ✔✔0.8 x Factory AC Test x 1.6
✔✔What action level would apply to a Delta T of 25°C between component and ambient
air? - ✔✔Monitor until corrected
✔✔In a zone-interlocked low voltage circuit breaker protection scheme, the trip unit
responsible for clearing the fault is inoperative. Which statement is most true? - ✔✔The
next circuit breaker upstream will trip
✔✔What would a reactor placed at the end of a long transmission line be used for? -
✔✔Current control
✔✔Which of the following is not a common diagnostic test that can be performed using
the tan-delta test set: - ✔✔VLF-DC
✔✔What is the NETA-MTS recommended maximum AC test voltage for a high-potential
test on a three-phase, 15kV line sectionalizer with a rated impulse withstand voltage of
95kV? - ✔✔26.2kV
✔✔A grounding connection to earth from a lightning protection system should be made
at diagonal corners of the structure. - ✔✔True
✔✔Which of the following would significantly reduce ground grid impedance? -
✔✔Double ground rod length
✔✔What is the minimum acceptable megohm value for a metal-oxide surge arrester
rated 15kV with an MCOV rating of 12.7kV per NETA standards? - ✔✔5,000 Megohms
✔✔What is the minimum acceptable test limit for an ASTM D1816 (2mm gap) test on
mineral oil used in new 230kV equipment? - ✔✔60kV
✔✔The ________ rating refers to the maximum current a protective device, such as a
fuse or circuit breaker, can safely interrupt. - ✔✔interrupting
✔✔Distance Relays may be directional or non-directional. - ✔✔True
✔✔Which of the following would you not expect to find in an IEC 61850 object name? -
✔✔Device Address
✔✔A single-phase transformer has a nameplate voltage rating of 7,200/480. The actual
incoming voltage is 6,700V. A secondary voltage of 460V is desired. Which of the
SOLUTIONS RATED A+
✔✔R rated fuses are used for: - ✔✔Protection for motors
R-rated fuses provide required short-circuit protection for medium voltage motors, motor
controllers and associated circuitry. Relays provide both overload protection and locked
rotor protection to the motor.
✔✔Which of the following would be a factor in choosing between 100%, 133%, and
173% Medium voltage cable for a power system? - ✔✔Ground Fault protection
✔✔During the performance of a thermographic scan of similar components within the
switchboard that are under similar load, at what temperature difference does NETA
recommend investigation? - ✔✔1-3 deg C
✔✔In calculating the thickness of insulators for high-voltage AC power lines, which type
of measurement is the best to use for voltage? - ✔✔Peak
✔✔What type of sensing element can measure a transformer's hottest-spot (winding)
temperature directly? - ✔✔Fiber optic cable
✔✔Before acceptance testing begins, what steps should be taken as part of the
commissioning process? - ✔✔Inspect devices for variations from design specifications
✔✔Which of the following would not significantly reduce ground resistance? -
✔✔Increased ground rod diameter
✔✔In a typical stepped distance protection scheme, Zone 4 is used as a backup for an
adjacent transmission line in the reverse direction in case the protection in that line fails.
This zone is usually set to _____ of the adjacent line. - ✔✔20-50%
✔✔The power factor of SF6 circuit breaker bushings is to be within _____ percent of
nameplate per NETA-ATS. - ✔✔10%
✔✔Two 5H inductors connected in series are subjected to an electric current that
changes at a rate of 4.5 amps per second. How much voltage will be dropped across
the series combination? - ✔✔45.00
V = L(di/dt)
Be aware of "Two 5H inductors" - Inductors Add
✔✔Hard hats suitable for the performance of low voltage electrical work, but NOT for
higher voltage electrical work, are identified as being: - ✔✔Class G
,✔✔Which of the following would NOT be part of the test plan for a 21 device? -
✔✔Determine pickup frequency
✔✔Confined space attendants may be assigned to monitor more than one permit
space. - ✔✔True
✔✔Which of the following conditions produces ferroresonance? - ✔✔XC = XL
✔✔Cell internal ohmic values (resistance, impedance or conductance) should not vary
by more than _____ between identical cells that are in a fully charged state. - ✔✔25
percent
✔✔An interfacial tension test value indicates the_______. - ✔✔Attraction between
water and oil
✔✔What is the maximum allowable water content for FR3 insulating liquid received in
new equipment? - ✔✔25 ppm
✔✔Which type of fiber optic cable is specifically designed for harsh outdoor
environments? - ✔✔loose-tube
✔✔According to ANSI/NETA MTS, how often should a medium voltage switchgear with
a high reliability requirement in good condition be electrically tested and maintained? -
✔✔18 months
✔✔How often do you need to update your NFPA 70E lock out/tag out training? -
✔✔every 3 years
✔✔Which of the following statements is true according to the NEC definition of a
switchboard? - ✔✔Switchboards may be accessible from the front or from the rear.
✔✔In a typical stepped distance protection scheme, Zone 3 is set to overreach to an
adjacent transmission line as a backup in case Zone 2 in that line fails. This zone is
commonly set to _____, assuming the impedance of both lines are the same. -
✔✔220%
✔✔A typical value for insulation power factor tests (CHL) of a large dry-type power
transformer is ____ percent or less. - ✔✔2.0
✔✔As an industry standard, IEEE recommends that LTC services be performed how
often? - ✔✔every three to five years
, ✔✔Which of these formulas would be most appropriate for a Field DC Acceptance test
on rotating equipment insulation? - ✔✔0.8 x Factory AC Test x 1.6
✔✔What action level would apply to a Delta T of 25°C between component and ambient
air? - ✔✔Monitor until corrected
✔✔In a zone-interlocked low voltage circuit breaker protection scheme, the trip unit
responsible for clearing the fault is inoperative. Which statement is most true? - ✔✔The
next circuit breaker upstream will trip
✔✔What would a reactor placed at the end of a long transmission line be used for? -
✔✔Current control
✔✔Which of the following is not a common diagnostic test that can be performed using
the tan-delta test set: - ✔✔VLF-DC
✔✔What is the NETA-MTS recommended maximum AC test voltage for a high-potential
test on a three-phase, 15kV line sectionalizer with a rated impulse withstand voltage of
95kV? - ✔✔26.2kV
✔✔A grounding connection to earth from a lightning protection system should be made
at diagonal corners of the structure. - ✔✔True
✔✔Which of the following would significantly reduce ground grid impedance? -
✔✔Double ground rod length
✔✔What is the minimum acceptable megohm value for a metal-oxide surge arrester
rated 15kV with an MCOV rating of 12.7kV per NETA standards? - ✔✔5,000 Megohms
✔✔What is the minimum acceptable test limit for an ASTM D1816 (2mm gap) test on
mineral oil used in new 230kV equipment? - ✔✔60kV
✔✔The ________ rating refers to the maximum current a protective device, such as a
fuse or circuit breaker, can safely interrupt. - ✔✔interrupting
✔✔Distance Relays may be directional or non-directional. - ✔✔True
✔✔Which of the following would you not expect to find in an IEC 61850 object name? -
✔✔Device Address
✔✔A single-phase transformer has a nameplate voltage rating of 7,200/480. The actual
incoming voltage is 6,700V. A secondary voltage of 460V is desired. Which of the
