NETA 3 LATEST 2026 EXAM QUESTIONS AND SOLUTIONS
RATED A+
✔✔In which protection scheme does the magnitude and phase angle of the current
flowing at each end of the line determine whether an internal fault exists. - ✔✔Pilot-Wire
✔✔Which of the following ASTM test methods would best measure the neutralization
(acid) number of insulating liquid? - ✔✔D974
✔✔Dielectric Breakdown - ✔✔D877
✔✔Dielectric Breakdown kV minimum @ 1mm & 2mm - ✔✔D1816
✔✔Interfacial Tension (mN/m min.) - ✔✔D971
✔✔Neutralization Number (mg KOH/g max.)
Neutralization Number of Less Flammable - ✔✔D974
D664
✔✔Water content - ✔✔D1533
✔✔Power Factor @ 25 C and 100 C - ✔✔D924
✔✔Color Test of insulating liquid - ✔✔D1500
✔✔Visual Condition of insulating liquid - ✔✔D1524
✔✔Specific Gravity - ✔✔D1298
✔✔Fire Point of insulating liquid - ✔✔D92
✔✔What is the expected Maximum Trip Time (in Seconds) for a 480V, 100A molded-
case circuit breaker inverse time test at 300% of Rated Continuous Current? - ✔✔160
✔✔The minimum allowable work space around electrical equipment is _____ inches
wide. - ✔✔30
✔✔Where raceways contain insulated circuit conductors _____ and larger, the
conductors shall be protected from abrasion during and after installation by an identified
fitting providing a smoothly rounded insulating surface. - ✔✔4 AWG
✔✔The power factor of new mineral oil at 100C for equipment rated 69kV and below
should be _____ % or less. - ✔✔0.40
, ✔✔Power fuse resistance readings on a MV Switch deviate by than 30%. What is the
NETA recommendation? - ✔✔Inspect
✔✔The Angle of Zone of protection of a lightning protection system is approximately: -
✔✔45 degrees
✔✔Concrete-Encased Grounding Electrodes are often referred to as: - ✔✔Ufer Ground
✔✔You are asked to analyze a thermographic image of a single insulated electrical
connection under 60% load, the ambient temperature recorded was 72°F and
temperature points on the image indicate a temperature of 112°F at the connection in
question, what would be the appropriate action level? - ✔✔Monitor until corrected
✔✔Point-to-point resistance values on new grounding systems in a generating station
that exceed ___ should be investigated. - ✔✔500 milliohms
✔✔What is the Limited Approach Boundary for a 4160V switchgear? - ✔✔60 inches
✔✔When ________ switchboard metering is used, power is still applied to the utility
meter after the service main has been switched off. - ✔✔hot sequence
✔✔What is the minimum acceptable test limit for an ASTM D1816 (2mm gap) test on
mineral oil used in new 69kV equipment? - ✔✔55kV
✔✔A new 69kV-35kV power transformer filled with FR3 is being placed into service,
what is the minimum acceptable dielectric breakdown voltage for a transformer of this
voltage class when tested in accordance with ASTM D1816 (2mm gap)? - ✔✔50kV
✔✔Total Harmonic Distortion (THD) is defined as the ratio of the Actual Fundamental to
RMS harmonic content. - ✔✔False
✔✔What is the insulation-resistance acceptance test duration of a 250HP AC induction
motor? - ✔✔10 Minutes
✔✔A hipot is a test set used to test capacitor _____. - ✔✔dielectric
✔✔What is the biggest cause of insulation failure in medium and high voltage rotating
machinery? - ✔✔Corona
✔✔Buchholz relays are installed: - ✔✔Between main tank and conservator
RATED A+
✔✔In which protection scheme does the magnitude and phase angle of the current
flowing at each end of the line determine whether an internal fault exists. - ✔✔Pilot-Wire
✔✔Which of the following ASTM test methods would best measure the neutralization
(acid) number of insulating liquid? - ✔✔D974
✔✔Dielectric Breakdown - ✔✔D877
✔✔Dielectric Breakdown kV minimum @ 1mm & 2mm - ✔✔D1816
✔✔Interfacial Tension (mN/m min.) - ✔✔D971
✔✔Neutralization Number (mg KOH/g max.)
Neutralization Number of Less Flammable - ✔✔D974
D664
✔✔Water content - ✔✔D1533
✔✔Power Factor @ 25 C and 100 C - ✔✔D924
✔✔Color Test of insulating liquid - ✔✔D1500
✔✔Visual Condition of insulating liquid - ✔✔D1524
✔✔Specific Gravity - ✔✔D1298
✔✔Fire Point of insulating liquid - ✔✔D92
✔✔What is the expected Maximum Trip Time (in Seconds) for a 480V, 100A molded-
case circuit breaker inverse time test at 300% of Rated Continuous Current? - ✔✔160
✔✔The minimum allowable work space around electrical equipment is _____ inches
wide. - ✔✔30
✔✔Where raceways contain insulated circuit conductors _____ and larger, the
conductors shall be protected from abrasion during and after installation by an identified
fitting providing a smoothly rounded insulating surface. - ✔✔4 AWG
✔✔The power factor of new mineral oil at 100C for equipment rated 69kV and below
should be _____ % or less. - ✔✔0.40
, ✔✔Power fuse resistance readings on a MV Switch deviate by than 30%. What is the
NETA recommendation? - ✔✔Inspect
✔✔The Angle of Zone of protection of a lightning protection system is approximately: -
✔✔45 degrees
✔✔Concrete-Encased Grounding Electrodes are often referred to as: - ✔✔Ufer Ground
✔✔You are asked to analyze a thermographic image of a single insulated electrical
connection under 60% load, the ambient temperature recorded was 72°F and
temperature points on the image indicate a temperature of 112°F at the connection in
question, what would be the appropriate action level? - ✔✔Monitor until corrected
✔✔Point-to-point resistance values on new grounding systems in a generating station
that exceed ___ should be investigated. - ✔✔500 milliohms
✔✔What is the Limited Approach Boundary for a 4160V switchgear? - ✔✔60 inches
✔✔When ________ switchboard metering is used, power is still applied to the utility
meter after the service main has been switched off. - ✔✔hot sequence
✔✔What is the minimum acceptable test limit for an ASTM D1816 (2mm gap) test on
mineral oil used in new 69kV equipment? - ✔✔55kV
✔✔A new 69kV-35kV power transformer filled with FR3 is being placed into service,
what is the minimum acceptable dielectric breakdown voltage for a transformer of this
voltage class when tested in accordance with ASTM D1816 (2mm gap)? - ✔✔50kV
✔✔Total Harmonic Distortion (THD) is defined as the ratio of the Actual Fundamental to
RMS harmonic content. - ✔✔False
✔✔What is the insulation-resistance acceptance test duration of a 250HP AC induction
motor? - ✔✔10 Minutes
✔✔A hipot is a test set used to test capacitor _____. - ✔✔dielectric
✔✔What is the biggest cause of insulation failure in medium and high voltage rotating
machinery? - ✔✔Corona
✔✔Buchholz relays are installed: - ✔✔Between main tank and conservator
