Level 3 NETA ETT Electrical Testing
Technician Certification Exam 2025/ NETA
ETT LEVEL 3 Certification Test 2025 With 290
Questions With Correct Answers And
Detailed Rationales
A newly installed 4160V emergency
generator has an insulation resistance value
of 150 Megohms after one minute with an
equipment temperature of 32 degrees C. Is
this value acceptable per NETA standards?
No
NETA ATS-2017 Table 100.11
https://testguy.net/content/240-Insulation-
Resistance-Test-Values
Know the NETA-ATS Insulation Resistance
tables
,Which test method measures Hydrolyzable
Flouride content in SF6 gas?
ASTM D2284
[Standard Test Method for Acidity of Sulfur
Hexafluoride]
NETA ATS-2017 Table 100.13
Know the ASTM test names what what they test
The operating speed of a protective relay is
dependent on:
* Spring Tension
* Armature core air gap
* Rate of flux built up
https://en.wikipedia.org/wiki/Protective_relay#T
ypes_according_to_construction
This was originally a 'not question'. This list is
not necessarily conclusive. It's simply the
'incorrect' answers to the 'not question'.
,According to IEEE C57.106, which test is
recommended for routine acceptance of new,
unprocessed oil from a supplier for use in
circuit breakers?
ASTM D877
[Standard Test Method for Dielectric
Breakdown Voltage of Insulating Liquids Using
Disk Electrodes]
https://hvtechnologies.com/which-oil-testing-
standard-should-you-choose-to-determine-
dielectric-breakdown-voltage/
Know IEEE C57 information. Know ASTM
tests and definitions
Meter Sockets and meter disconnect switches
should generally be connected on what side of
a service disconnecting means?
The line side
NFPA 70-2017 Article 230.82(3)
, https://www.electricallicenserenewal.com/Electr
ical-Continuing-Education-Courses/NEC-
Content.php?sectionID=40.0
This was originally a True/False statement
question. The answer stated that the load side is
wrong. The reference above seems to imply that
meter sockets and meter disconnect switches
should generally be connected on the line side.
Know NFPA 70
What size neutral resistor would be required
to limit the fault current of a 13,800-
480Y/277V 1500kVA Transformer to 5A?
55.4
Know Ohm's Law. 277 V / 5A = 55.4 ohms
I believe that since this is dealing with the
neutral, Line-Neutral voltage (277 V) should be
used in the formula. 5 A on the line will also be
Technician Certification Exam 2025/ NETA
ETT LEVEL 3 Certification Test 2025 With 290
Questions With Correct Answers And
Detailed Rationales
A newly installed 4160V emergency
generator has an insulation resistance value
of 150 Megohms after one minute with an
equipment temperature of 32 degrees C. Is
this value acceptable per NETA standards?
No
NETA ATS-2017 Table 100.11
https://testguy.net/content/240-Insulation-
Resistance-Test-Values
Know the NETA-ATS Insulation Resistance
tables
,Which test method measures Hydrolyzable
Flouride content in SF6 gas?
ASTM D2284
[Standard Test Method for Acidity of Sulfur
Hexafluoride]
NETA ATS-2017 Table 100.13
Know the ASTM test names what what they test
The operating speed of a protective relay is
dependent on:
* Spring Tension
* Armature core air gap
* Rate of flux built up
https://en.wikipedia.org/wiki/Protective_relay#T
ypes_according_to_construction
This was originally a 'not question'. This list is
not necessarily conclusive. It's simply the
'incorrect' answers to the 'not question'.
,According to IEEE C57.106, which test is
recommended for routine acceptance of new,
unprocessed oil from a supplier for use in
circuit breakers?
ASTM D877
[Standard Test Method for Dielectric
Breakdown Voltage of Insulating Liquids Using
Disk Electrodes]
https://hvtechnologies.com/which-oil-testing-
standard-should-you-choose-to-determine-
dielectric-breakdown-voltage/
Know IEEE C57 information. Know ASTM
tests and definitions
Meter Sockets and meter disconnect switches
should generally be connected on what side of
a service disconnecting means?
The line side
NFPA 70-2017 Article 230.82(3)
, https://www.electricallicenserenewal.com/Electr
ical-Continuing-Education-Courses/NEC-
Content.php?sectionID=40.0
This was originally a True/False statement
question. The answer stated that the load side is
wrong. The reference above seems to imply that
meter sockets and meter disconnect switches
should generally be connected on the line side.
Know NFPA 70
What size neutral resistor would be required
to limit the fault current of a 13,800-
480Y/277V 1500kVA Transformer to 5A?
55.4
Know Ohm's Law. 277 V / 5A = 55.4 ohms
I believe that since this is dealing with the
neutral, Line-Neutral voltage (277 V) should be
used in the formula. 5 A on the line will also be
