NETA ETT Cer fied Level 3/ Ques ons pulled from the
NETA 3 prac ce test from testguy.net. Answers include
reference documents when available.
A newly installed 4160V emergency generator has an insula on resistance value of 150
Megohms a*er one minute with an equipment temperature of 32 degrees C. Is this value
acceptable per NETA standards?
No
NETA ATS-2017 Table 100.11
h ps://testguy.net/content/240-Insula on-Resistance-Test-Values
Know the NETA-ATS Insula on 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 opera ng speed of a protec ve relay is dependent on:
* Spring Tension
* Armature core air gap
* Rate of flux built up
h ps://en.wikipedia.org/wiki/Protec ve_relay#Types_according_to_construc on
This was originally a 'not ques on'. This list is not necessarily conclusive. It's simply the
'incorrect' answers to the 'not ques on'.
,According to IEEE C57.106, which test is recommended for rou ne acceptance of new,
unprocessed oil from a supplier for use in circuit breakers?
ASTM D877
[Standard Test Method for Dielectric Breakdown Voltage of Insula ng Liquids Using Disk
Electrodes]
h ps://hvtechnologies.com/which-oil-tes ng-standard-should-you-choose-to-determine-
dielectric-breakdown-voltage/
Know IEEE C57 informa on. Know ASTM tests and defini ons
Meter Sockets and meter disconnect switches should generally be connected on what side of
a service disconnec ng means?
The line side
NFPA 70-2017 Ar cle 230.82(3)
h ps://www.electricallicenserenewal.com/Electrical-Con nuing-Educa on-Courses/NEC-
Content.php?sec onID=40.0
This was originally a True/False statement ques on. 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 5A on the windings since the transformer
,configura on is a Wye configura on. I also believe that the impedance of the transformer is
negligible in this calcula on since it isn't men oned in the ques on and presumably would only
limit the fault current further.
Correc ng the power factor of three-phase loads normally involves adding (capacitance,
inductance) in (series, parallel)
capacitance in parallel
h p://archive.is/WOiLd
Typically, power factor is offset by increased inductance. Adding capacitance in parallel corrects
this.
The voltage induced into the armature of a DC motor is known as the:
CEMF
[counter-electromo ve force]
h ps://en.wikipedia.org/wiki/Counter-electromo ve_force
As a ba>ery cell starts discharging, internal resistance of the cell will _____ .
increase
h p://ba eryuniversity.com/learn/ar cle/discharge_methods
Link leads to a paywall. The reason why the internal resistance increases appears to have to do
with change in electrolyte concentra on.
When conduc ng an ASTM D877 dielectric breakdown test, the fluid is con nuously s rred.
True or False
False
h ps://hvtechnologies.com/which-oil-tes ng-standard-should-you-choose-to-determine-
dielectric-breakdown-voltage/
, Know ASTM tests and defini ons. Know IEC tests and defini ons.
Some dielectric breakdown tests require s rring, some don't. I guess the point of the ques on is
to test knowledge of which of these tests involve s rring. It is probably also useful to know the
other differences between the tests. The tests are ASTM D877, ASTM D1816, and IEC 60156.
What are the necessary requirements to operate two transformers in parallel?
* Same Phase Angle ShiK
* Same Polarity
* Same Phase Sequence
* Same Frequency
h ps://electrical-engineering-portal.com/principles-of-transformers-in-parallel-connec on-1
The original ques on was a 'not ques on'. There are other condi ons which are nice to have for
op mal opera on but are not strictly necessary
What are the convenient (but not necessary) requirements to operate two transformers in
parallel?
* Same voltage ra o and turns ra o
* Same Percentage Impedance
* Same KVA Ra ng
* Same posi on of tap changer
h ps://electrical-engineering-portal.com/principles-of-transformers-in-parallel-connec on-1
This is a ques on I made up that is derived from another ques on asking about necessary
requirements.
What is the maximum acceptable neutraliza on number for a new 35kV power transformer
filled with FR3 insula ng liquid that was tested in accordance with ASTM D974?
0.03 mg KOH/g
NETA ATS-2017 Table 100.4.3
In NFPA 70E Sec on 130.4, Shock Risk Assessment, if addi onal protec ve measures are
required, what should be iden fied?
NETA 3 prac ce test from testguy.net. Answers include
reference documents when available.
A newly installed 4160V emergency generator has an insula on resistance value of 150
Megohms a*er one minute with an equipment temperature of 32 degrees C. Is this value
acceptable per NETA standards?
No
NETA ATS-2017 Table 100.11
h ps://testguy.net/content/240-Insula on-Resistance-Test-Values
Know the NETA-ATS Insula on 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 opera ng speed of a protec ve relay is dependent on:
* Spring Tension
* Armature core air gap
* Rate of flux built up
h ps://en.wikipedia.org/wiki/Protec ve_relay#Types_according_to_construc on
This was originally a 'not ques on'. This list is not necessarily conclusive. It's simply the
'incorrect' answers to the 'not ques on'.
,According to IEEE C57.106, which test is recommended for rou ne acceptance of new,
unprocessed oil from a supplier for use in circuit breakers?
ASTM D877
[Standard Test Method for Dielectric Breakdown Voltage of Insula ng Liquids Using Disk
Electrodes]
h ps://hvtechnologies.com/which-oil-tes ng-standard-should-you-choose-to-determine-
dielectric-breakdown-voltage/
Know IEEE C57 informa on. Know ASTM tests and defini ons
Meter Sockets and meter disconnect switches should generally be connected on what side of
a service disconnec ng means?
The line side
NFPA 70-2017 Ar cle 230.82(3)
h ps://www.electricallicenserenewal.com/Electrical-Con nuing-Educa on-Courses/NEC-
Content.php?sec onID=40.0
This was originally a True/False statement ques on. 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 5A on the windings since the transformer
,configura on is a Wye configura on. I also believe that the impedance of the transformer is
negligible in this calcula on since it isn't men oned in the ques on and presumably would only
limit the fault current further.
Correc ng the power factor of three-phase loads normally involves adding (capacitance,
inductance) in (series, parallel)
capacitance in parallel
h p://archive.is/WOiLd
Typically, power factor is offset by increased inductance. Adding capacitance in parallel corrects
this.
The voltage induced into the armature of a DC motor is known as the:
CEMF
[counter-electromo ve force]
h ps://en.wikipedia.org/wiki/Counter-electromo ve_force
As a ba>ery cell starts discharging, internal resistance of the cell will _____ .
increase
h p://ba eryuniversity.com/learn/ar cle/discharge_methods
Link leads to a paywall. The reason why the internal resistance increases appears to have to do
with change in electrolyte concentra on.
When conduc ng an ASTM D877 dielectric breakdown test, the fluid is con nuously s rred.
True or False
False
h ps://hvtechnologies.com/which-oil-tes ng-standard-should-you-choose-to-determine-
dielectric-breakdown-voltage/
, Know ASTM tests and defini ons. Know IEC tests and defini ons.
Some dielectric breakdown tests require s rring, some don't. I guess the point of the ques on is
to test knowledge of which of these tests involve s rring. It is probably also useful to know the
other differences between the tests. The tests are ASTM D877, ASTM D1816, and IEC 60156.
What are the necessary requirements to operate two transformers in parallel?
* Same Phase Angle ShiK
* Same Polarity
* Same Phase Sequence
* Same Frequency
h ps://electrical-engineering-portal.com/principles-of-transformers-in-parallel-connec on-1
The original ques on was a 'not ques on'. There are other condi ons which are nice to have for
op mal opera on but are not strictly necessary
What are the convenient (but not necessary) requirements to operate two transformers in
parallel?
* Same voltage ra o and turns ra o
* Same Percentage Impedance
* Same KVA Ra ng
* Same posi on of tap changer
h ps://electrical-engineering-portal.com/principles-of-transformers-in-parallel-connec on-1
This is a ques on I made up that is derived from another ques on asking about necessary
requirements.
What is the maximum acceptable neutraliza on number for a new 35kV power transformer
filled with FR3 insula ng liquid that was tested in accordance with ASTM D974?
0.03 mg KOH/g
NETA ATS-2017 Table 100.4.3
In NFPA 70E Sec on 130.4, Shock Risk Assessment, if addi onal protec ve measures are
required, what should be iden fied?
