Remembered NETA 2 Questions Help

[A_Powers1992]

To Whom it May Help:

Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not pass....AGAIN. 406/410. 4 points!!! Third time is charm right? Ugh! Best of luck to you all. You're gonna need it.

1.) What is the small notch in a fuse for?

2.) Which has the greatest TIME difference?

a.) Extremely inverse
b.) Inverse

Can't remember C and D sorry. I feel this may be a Level 3 question and I can honestly say the whole test felt littered with Level 3 questions!

3.) If a motor and chain are present on an OLTC, once the tap is raised to the highest level and it's still giving a raise signal, what should the OLTC motor do?

a.) motor stop, stay at raised level
b.) motor continue til raise signal is gone
c.) motor continue in reverse til back to neutral
d.) motor stop, cool down

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance

I would usually say Winding Resistance but it was not one of my choices.

5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....

8.) Interlock on MV MCC between switch and contactor. Why?

9.) What is the role of a VFD?

Watch for this one. The wording in the answers was VERY confusing.

10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???

And no, insulation test set was not a choice.

11.) What is the standard for testing UPS Batteries?

99% sure it is IEEE 450,1108, 1186. But what do I know??

12.) What are considered Network Protectors?

13.) You arrive to find a MV circuit breaker open. At the control panel in the adjacent room you see the mechanical switch open with a red flag. What would this indicate?

a.) The breaker lost control power
b.) The breaker was opened at the control panel

I cant remember C and D, I'm sorry!! Throw out common sense, because they clearly arent looking for that in one of their answers.

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
4.) Class 4

15.) How can you recognize the difference between fiber optic cables and insulated cables?

16.) What type of swtich is best used for commercial/light industrial services rated 2000/4000 A?

a.) safety switch
b.) metal enclosed interrupter
c.) bolted-pressure switch
d.) ??

I remembered 50 questions but these are the ones I recall taking the most time on when taking the test. Again, I hope this helps anyone preparing for their upcoming test and I hope someone may be able to assist in answering some of these items!

Thank you in advance and good luck to future test takers!!

AP

[SecondGen]

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance

I would usually say Winding Resistance but it was not one of my choices.

Magnetize the windings? DC current in winding resistance will magnetize the core.

Power Factor - Windings shorted together, would not magnetize windings.
TTR - Primary and secondary voltage is measured, windings are "magnitized" just like in service.
Excitation - Magnetic induction is created but other windings are shorted.
Zero-Sequence Impedance - Not to familiar with this test but from what I understand it is a AC current based test.

Based on this I'd say either TTR or Zero-Sequence but I'm leaning more toward TTR.

[SecondGen]

2.) Which has the greatest TIME difference?

a.) Extremely inverse
b.) Inverse

Can't remember C and D sorry.


Extremely inverse (CO-11) is the sharpest curve.

https://testguy.net/uploads/overcurrent-relay-inverse-curve-degrees.jpg

CO-6: Definite minimum
CO-7: Moderately inverse
CO-8: Inverse
CO-9: Very inverse
CO-11: Extremely inverse

[SecondGen]

16.) What type of swtich is best used for commercial/light industrial services rated 2000/4000 A?

a.) safety switch
b.) metal enclosed interrupter
c.) bolted-pressure switch
d.) ??


A fused bolted-pressure switch is what I usually find find for this type of service < 600V in my area.

[SecondGen]

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
d.) Class 4

This could be b, c, or d but NEMA 4 would offer the most protection.

https://testguy.net/content/158-NEMA-Enclosures-for-Electrical-Equipment

[SecondGen]

3.) If a motor and chain are present on an OLTC, once the tap is raised to the highest level and it's still giving a raise signal, what should the OLTC motor do?

a.) motor stop, stay at raised level
b.) motor continue til raise signal is gone
c.) motor continue in reverse til back to neutral
d.) motor stop, cool down


I'm thinking motor should stop and stay at highest level. A?

[SecondGen]

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....


Probably referring to the service entrance but this test is done to ensure that no other grounds are landed which could result in reduced GF sensitivity. Should be bonded at a single point near the transformer.

[SecondGen]

13.) You arrive to find a MV circuit breaker open. At the control panel in the adjacent room you see the mechanical switch open with a red flag. What would this indicate?

a.) The breaker lost control power
b.) The breaker was opened at the control panel

I cant remember C and D, I'm sorry!! Throw out common sense, because they clearly arent looking for that in one of their answers.

Usually the flag just tells you the last position in which the mechanical switch was operated and nothing more.

[SecondGen]

15.) How can you recognize the difference between fiber optic cables and insulated cables?

This is usually fairly obvious by the jacket, any guesses on answer options?

[A_Powers1992]

Magnetize the windings? DC current in winding resistance will magnetize the core.

Power Factor - Windings shorted together, would not magnetize windings.
TTR - Primary and secondary voltage is measured, windings are "magnitized" just like in service.
Excitation - Magnetic induction is created but other windings are shorted.
Zero-Sequence Impedance - Not to familiar with this test but from what I understand it is a AC current based test.

Based on this I'd say either TTR or Zero-Sequence but I'm leaning more toward TTR.

Awesome! Thank you so much for your help!

[A_Powers1992]

I'm thinking motor should stop and stay at highest level. A?

I agree! After speaking to other technicians in my company and reaching out to a XFMR OLTC Manufacturer, they stated A should be the correct answer.

[A_Powers1992]

This is usually fairly obvious by the jacket, any guesses on answer options?

I can't remember the exact answers. If I recall I think one of the answers had to do with the termination type, and one answer also had to do with the cable type (THHN, THWN). Both of those cable types would be associated with LV cables and not fiber cables correct? Thank you again for your input on this question! @SecondGen

[SecondGen]

I can't remember the exact answers. If I recall I think one of the answers had to do with the termination type, and one answer also had to do with the cable type (THHN, THWN). Both of those cable types would be associated with LV cables and not fiber cables correct? Thank you again for your input on this question! @SecondGen

I would suspect some reference to a connector or what is written on the jacket as you have stated. Fiber optic cables are typically very thin and have a bright orange jacket.

THHN, THWN would be 600V rated cable. Anything with a twist type or plug connector would most likely be fiber optic as control wires typically land on a screw terminal of some kind.

[michaellabeit]

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance

I would usually say Winding Resistance but it was not one of my choices.
AP

My understanding is that excitation tests magnetize the CTs. This Testguy article (https://testguy.net/content/264-6-electrical-tests-for-Current-Transformers-explained#excitation) from 2017 says the following:

"Excitation tests are performed by applying an AC voltage to the secondary winding of the CT and increasing the voltage in steps until the CT is in saturation. The "Knee" point is determined by observing a small voltage increase causing a large increase in current.

The test voltage is slowly decreased to zero to de‐magnetize the CT. The test results are plotted on a logarithmic (log‐log) graph and evaluated based on the transition period between normal operation and saturation."

Winding resistance tests also magnetize the CTs, but that's not one of the answers.

[SecondGen]

My understanding is that excitation tests magnetize the CTs. This Testguy article (https://testguy.net/content/264-6-electrical-tests-for-Current-Transformers-explained#excitation) from 2017 says the following:

"Excitation tests are performed by applying an AC voltage to the secondary winding of the CT and increasing the voltage in steps until the CT is in saturation. The "Knee" point is determined by observing a small voltage increase causing a large increase in current.

The test voltage is slowly decreased to zero to de‐magnetize the CT. The test results are plotted on a logarithmic (log‐log) graph and evaluated based on the transition period between normal operation and saturation."

Winding resistance tests also magnetize the CTs, but that's not one of the answers.

I wasn't even thinking about current transformers but you are correct in that case. My assumption was PF and excitation were referring to the same thing but they could be talking about CT's.

[sleepiejak]

This is usually fairly obvious by the jacket, any guesses on answer options?

I have only been out out of the navy for 2 years (ish) but typically Ive been seeing orange jacket on fiber opt. cable.

[jrm5116]

5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A


Both 5 and 6 are d.

Multimeters are high impedance in parallel, so the impedance of the multimeter does not effect the measured device (think about current through parallel resistors, almost no current will flow through one that is sufficiently larger than the other). This only applies to voltage measurements though. Current would be the inverse if you don't have a clamp on meter and were measuring current in series however, so it's weird they worded it like that. I'm just assuming they're referring to a voltmeter.

I've seen a lot of settings lately and they will not let you set the GF greater than 1200A. This is in NEC 230.95 (a) (I'm using 2017, I don't believe the wording has changed though)

[bec51392]

This could be b, c, or d but NEMA 4 would offer the most protection.

https://testguy.net/content/158-NEMA-Enclosures-for-Electrical-Equipment

from my contractor days R is outdoor. stands for rainproof

[bec51392]

Usually the flag just tells you the last position in which the mechanical switch was operated and nothing more.

When I first read this question I assumed "flag" was a light... and a light could mean control power was still proper.

[bec51392]

1.) What is the small notch in a fuse for?
rejection notch, keeps you from installing an improperly rated fuse

"A rejection feature is used to prevent fuses with a lower voltage or interrupting rating (such as Class H and Midget fuses) from being used in a circuit that needs a higher rating. Class R and CC fuseblocks incorporate a built-in rejection feature while Class J and T blocks reject based on physical size"

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A

NEC Paragraph 230-95(a) specifies the maximum ground fault protection setting to be 1,200 amperes


7.) Why do an insulation test between neutral and ground?

gotta confirm its only grounded in one spot and that its the proper spot

10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???

are you certain this is worded right?

11.) What is the standard for testing UPS Batteries?

This could be taken a couple ways. Was the question what is the IEEE standard? I would say 1184.... but there are a few different IEEE standards that NETA points to depending on type.

supposedly nfpa 855 also has some info, but I haven't personally looked

12.) What are considered Network Protectors?
I think I got this question. Is it supposed to read "what do network protectors consist of?"?

13.) You arrive to find a MV circuit breaker open. At the control panel in the adjacent room you see the mechanical switch open with a red flag. What would this indicate?

a.) The breaker lost control power
b.) The breaker was opened at the control panel

pretty sure this is b

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
4.) Class 4

3R, R stands for Rainproof.

15.) How can you recognize the difference between fiber optic cables and insulated cables?

cut em' in half and look inside! kidding. I think its the jacket

16.) What type of switch is best used for commercial/light industrial services rated 2000/4000 A?

a.) safety switch
b.) metal enclosed interrupter
c.) bolted-pressure switch
d.) ??


Im pretty sure this is bolted pressure switch. I think safety switches max out at 1200
There is a testguy write up on it somewhere that I vaguely remember reading. I'll try to find it.

[Miller1085]

This could be b, c, or d but NEMA 4 would offer the most protection.

https://testguy.net/content/158-NEMA-Enclosures-for-Electrical-Equipment


NEMA 3R enclosures are compatible for both indoor or outdoor applications and holds the least demanding rating for outdoor use.

NEMA 3R Characteristics:

Protection against incidental contact with enclosed equipment
Protection from falling dirt, rain, sleet and/or snow
Drainage provision
Protection against rain at a level higher than the lowest live part
Alternate locking and latching mechanisms available

[rofo42]

To Whom it May Help:



4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance





Doble criteria my company uses states that a TTR test can magnetize the core, not windings. Excitation testing is to be performed before TTR for this reason.

[cnowak]

Thank you for the questions. Some of these I did not know either. More stuff to study I guess.

[Kalbi_Rob]

Doble criteria my company uses states that a TTR test can magnetize the core, not windings. Excitation testing is to be performed before TTR for this reason.

Excerpt from FACILITIES INSTRUCTIONS, STANDARDS, AND TECHNIQUES, VOLUME 3-31, TRANSFORMER DIAGNOSTICS


CAUTION:
Perform the excitation test before any direct current (dc)
tests. Excitation Current Tests should never be
conducted after a dc test has been performed on the
transformer. Results will be incorrect because of
residual magnetism of the core left from the dc tests.

DC WINDING RESISTANCE MEASUREMENT is the largest DC test performed on the transformer. TTR and IR testing does not have the same power applied to cause significant magnetism.
My practice has always been to perform Power Factor Testing before any other test. I've had arguments with techs that NETA says to perform IR test first or perform IR first to check condition of Xfmr to prevent unnecessary tests (neither I agree are important as the above caution). I've always performed winding resistance last, since that same test set has the ability to de-mag the XFMR.

[Izeldeen]

This could be b, c, or d but NEMA 4 would offer the most protection.

https://testguy.net/content/158-NEMA-Enclosures-for-Electrical-Equipment

it will be class 4, because class 4 is IP64, class 3 is IP54, class 3R is IP14

[Izeldeen]

To Whom it May Help:

Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not pass....AGAIN. 406/410. 4 points!!! Third time is charm right? Ugh! Best of luck to you all. You're gonna need it.

1.) What is the small notch in a fuse for?

2.) Which has the greatest TIME difference?

a.) Extremely inverse
b.) Inverse

Can't remember C and D sorry. I feel this may be a Level 3 question and I can honestly say the whole test felt littered with Level 3 questions!

3.) If a motor and chain are present on an OLTC, once the tap is raised to the highest level and it's still giving a raise signal, what should the OLTC motor do?

a.) motor stop, stay at raised level
b.) motor continue til raise signal is gone
c.) motor continue in reverse til back to neutral
d.) motor stop, cool down

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance

I would usually say Winding Resistance but it was not one of my choices.

5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....

8.) Interlock on MV MCC between switch and contactor. Why?

9.) What is the role of a VFD?

Watch for this one. The wording in the answers was VERY confusing.

10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???

And no, insulation test set was not a choice.

11.) What is the standard for testing UPS Batteries?

99% sure it is IEEE 450,1108, 1186. But what do I know??

12.) What are considered Network Protectors?

13.) You arrive to find a MV circuit breaker open. At the control panel in the adjacent room you see the mechanical switch open with a red flag. What would this indicate?

a.) The breaker lost control power
b.) The breaker was opened at the control panel

I cant remember C and D, I'm sorry!! Throw out common sense, because they clearly arent looking for that in one of their answers.

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
4.) Class 4

15.) How can you recognize the difference between fiber optic cables and insulated cables?

16.) What type of swtich is best used for commercial/light industrial services rated 2000/4000 A?

a.) safety switch
b.) metal enclosed interrupter
c.) bolted-pressure switch
d.) ??

I remembered 50 questions but these are the ones I recall taking the most time on when taking the test. Again, I hope this helps anyone preparing for their upcoming test and I hope someone may be able to assist in answering some of these items!

Thank you in advance and good luck to future test takers!!

AP

2.) Which has the greatest TIME difference?

answer is a.) Extremely inverse

[Izeldeen]

To Whom it May Help:

Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not pass....AGAIN. 406/410. 4 points!!! Third time is charm right? Ugh! Best of luck to you all. You're gonna need it.

1.) What is the small notch in a fuse for?

2.) Which has the greatest TIME difference?

a.) Extremely inverse
b.) Inverse

Can't remember C and D sorry. I feel this may be a Level 3 question and I can honestly say the whole test felt littered with Level 3 questions!

3.) If a motor and chain are present on an OLTC, once the tap is raised to the highest level and it's still giving a raise signal, what should the OLTC motor do?

a.) motor stop, stay at raised level
b.) motor continue til raise signal is gone
c.) motor continue in reverse til back to neutral
d.) motor stop, cool down

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance

I would usually say Winding Resistance but it was not one of my choices.

5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....

8.) Interlock on MV MCC between switch and contactor. Why?

9.) What is the role of a VFD?

Watch for this one. The wording in the answers was VERY confusing.

10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???

And no, insulation test set was not a choice.

11.) What is the standard for testing UPS Batteries?

99% sure it is IEEE 450,1108, 1186. But what do I know??

12.) What are considered Network Protectors?

13.) You arrive to find a MV circuit breaker open. At the control panel in the adjacent room you see the mechanical switch open with a red flag. What would this indicate?

a.) The breaker lost control power
b.) The breaker was opened at the control panel

I cant remember C and D, I'm sorry!! Throw out common sense, because they clearly arent looking for that in one of their answers.

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
4.) Class 4

15.) How can you recognize the difference between fiber optic cables and insulated cables?

16.) What type of swtich is best used for commercial/light industrial services rated 2000/4000 A?

a.) safety switch
b.) metal enclosed interrupter
c.) bolted-pressure switch
d.) ??

I remembered 50 questions but these are the ones I recall taking the most time on when taking the test. Again, I hope this helps anyone preparing for their upcoming test and I hope someone may be able to assist in answering some of these items!

Thank you in advance and good luck to future test takers!!

AP
5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance
answer is d

[Izeldeen]

To Whom it May Help:

Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not pass....AGAIN. 406/410. 4 points!!! Third time is charm right? Ugh! Best of luck to you all. You're gonna need it.

1.) What is the small notch in a fuse for?

2.) Which has the greatest TIME difference?

a.) Extremely inverse
b.) Inverse

Can't remember C and D sorry. I feel this may be a Level 3 question and I can honestly say the whole test felt littered with Level 3 questions!

3.) If a motor and chain are present on an OLTC, once the tap is raised to the highest level and it's still giving a raise signal, what should the OLTC motor do?

a.) motor stop, stay at raised level
b.) motor continue til raise signal is gone
c.) motor continue in reverse til back to neutral
d.) motor stop, cool down

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance

I would usually say Winding Resistance but it was not one of my choices.

5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....

8.) Interlock on MV MCC between switch and contactor. Why?

9.) What is the role of a VFD?

Watch for this one. The wording in the answers was VERY confusing.

10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???

And no, insulation test set was not a choice.

11.) What is the standard for testing UPS Batteries?

99% sure it is IEEE 450,1108, 1186. But what do I know??

12.) What are considered Network Protectors?

13.) You arrive to find a MV circuit breaker open. At the control panel in the adjacent room you see the mechanical switch open with a red flag. What would this indicate?

a.) The breaker lost control power
b.) The breaker was opened at the control panel

I cant remember C and D, I'm sorry!! Throw out common sense, because they clearly arent looking for that in one of their answers.

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
4.) Class 4

15.) How can you recognize the difference between fiber optic cables and insulated cables?

16.) What type of swtich is best used for commercial/light industrial services rated 2000/4000 A?

a.) safety switch
b.) metal enclosed interrupter
c.) bolted-pressure switch
d.) ??

I remembered 50 questions but these are the ones I recall taking the most time on when taking the test. Again, I hope this helps anyone preparing for their upcoming test and I hope someone may be able to assist in answering some of these items!

Thank you in advance and good luck to future test takers!!

AP
10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???

And no, insulation test set was not a choice.

answer is a

[sleepiejak]

This is usually fairly obvious by the jacket, any guesses on answer options?

from what ive seen out in the field so far. (getting to about 2 years) Ive only seen orange insulation as fiber. Its also kinda small and has a different termination then every other cable. the end kinda looks like a coax end to me

[BruceG400]

1.) What is the small notch in a fuse for?

Is the notch for "Rejection-type" which is represented as an "R" in the part number.

[BruceG400]

5.) A Multimeter is device that:

a.) is connected in series, low impedance
b.) is connected in series, high impedance
c.) is connected parallel, low impedance
d.) is connected parallel, high impedance
answer is d

I agree that the answer is D and would answer the question that way too, but not to forget that most DMMs are rated to be used at 10 amps in series with the circuit.
That would be more handy in an electronics circuit where accuracy would be a great concern, but it is an option, so the question is misleading since the DMM can technically be used in series and parallel.

[BruceG400]

6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A

Ground Fault protection can never exceed 1200 amps.
Even if the breaker is 4000 amps or larger and the dial for GF setting would reach 1200 amps on the first few notches of settings, once the setting reaches 1200 amp, the settings above that point will not go any higher than 1200 amps.

[BruceG400]

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....


We typically perform GF test for new installations. We typically remove neutral and/or neutral to ground bond to test for downstream bonding. This test can be performed with an ohm meter, but recently, we have had city inspectors require an insulation test (AKA Megger test) be performed to check for downstream bonding.
I agree that it is overkill, but the inspector gets what the inspector wants.

[BruceG400]

8.) Interlock on MV MCC between switch and contactor. Why?


My experience has been with a slow-close disconnect that was interlocked with the door/cover and the contactor.
The disconnect only closed/opened as fast as you moved your hand.
My thought was that the contactor had to be opened before operating the disconnect, that way the disconnect is not operated under load.
In this case, the contactor mechanism malfunctioned and stuck in a position, which also damaged the main disconnect linkage due to repeated attempts to operate the disconnect.

[BruceG400]

9.) What is the role of a VFD?

Watch for this one. The wording in the answers was VERY confusing.


VFD Variable Frequency Drive (also known as Variable Speed Drive) controls the speed of a motor by varying the frequency of voltage that is delivered to motor. The VFD rectifies the AC to DC, then DC is inverted to AC, but when the DC is inverted to AC, the frequency can be varied by the speed of switching in by PWM (Pulse Width Modulation).
This rapid switching comes at a price. To create a varied frequency, this switching can distort the sinewave, and/or cause excess vibration in the motor. The motor needs to be rated for use with a VFD or the motor may be short lived.

A VFD can also be used as a form of soft-start, but the main reason is to control the speed of the motor since starting and stopping a motor is harder on the motor than running it at a reduced speed.

[BruceG400]

14.) What is the outdoor panel class?

a.) Class 2
b.) Class 3
c.) Class 3R
4.) Class 4


Outdoor panel rating would be NEMA 3R. R for raintight. This does not mean it is submersible, it only means that rain that runs down the panel, will not makes its way into the enclosure due to how the lips of cover overlap or divert rain away from panel.
Typically a dry-type transformer is a NEMA 2 but can but can be converted to a 3R with additional rain guards over vents.

[Kalbi_Rob]

7.) Why do an insulation test between neutral and ground?

I read this and was confused on the wording. Are you talking service entrance or non service entrance? The question did not specify! Come on NETA. Killin me smalls....


We typically perform GF test for new installations. We typically remove neutral and/or neutral to ground bond to test for downstream bonding. This test can be performed with an ohm meter, but recently, we have had city inspectors require an insulation test (AKA Megger test) be performed to check for downstream bonding.
I agree that it is overkill, but the inspector gets what the inspector wants.

I would disagree as NETA ATS 7.14.2 states: Measure the system neutral-to-ground insulation resistance with the neutral disconnect link temporarily removed. Replace the neutral disconnect link after testing.

Definition of insulation resistance test is performed with active voltage applied. Resistance of a system can be checked using an ohmmeter, but insulation can only be tested via potential. I would agree with the City Inspector. I've always tested with ohmmeter prior to applying voltage as most systems are <1 ohm, and require additional work.

[BruceG400]

I would disagree as NETA ATS 7.14.2 states: Measure the system neutral-to-ground insulation resistance with the neutral disconnect link temporarily removed. Replace the neutral disconnect link after testing.

Definition of insulation resistance test is performed with active voltage applied. Resistance of a system can be checked using an ohmmeter, but insulation can only be tested via potential. I would agree with the City Inspector. I've always tested with ohmmeter prior to applying voltage as most systems are <1 ohm, and require additional work.

Since you agree with the inspector, are you saying you normally take a resistance reading for downstream bonding with an insulation resistance tester?
I agree that downstream bonding needs to be tested while any neutral to ground reference on line-side needs to be removed. We have always used an ohm-meter in the past to run this test with bonding jumper removed, but have only recently been required to use an insulation resistance tester.

[JCarroll]

I agree that the answer is D and would answer the question that way too, but not to forget that most DMMs are rated to be used at 10 amps in series with the circuit.
That would be more handy in an electronics circuit where accuracy would be a great concern, but it is an option, so the question is misleading since the DMM can technically be used in series and parallel.

On the test I took about a month ago the question actually asked something along the lines of

"A DMM used to measure voltage is connected:" or
"A DMM used to measure current is connected:"

It was in no way ambiguous as to what answer they were looking for.

[Kalbi_Rob]

Since you agree with the inspector, are you saying you normally take a resistance reading for downstream bonding with an insulation resistance tester?
I agree that downstream bonding needs to be tested while any neutral to ground reference on line-side needs to be removed. We have always used an ohm-meter in the past to run this test with bonding jumper removed, but have only recently been required to use an insulation resistance tester.

I've always taken my Megger MIT/420 and used the ohmmeter to verify Neutral and ground are clear with the neutral disconnect link removed. On New Construction (which for whatever reason the East Coast Mid-Atlantic region doesn't require NEC 230.95 test), I will take and perform a insulation resistance test. I don't perform it on maintenance test because of potential of downstream devices. So, for an inspector on new construction, yes per every procedure I have seen it is written as perform an insulation resistance test.

[Comx10]

I'm thinking motor should stop and stay at highest level. A?

I would have to agree with you there, regardless the motor needs to stop. whether it is A or D. These are the kind of questions that make the NETA test so difficult it seems to. The questions are almost open ended as it seems to me but in the real world it is exact and just go by the book and the manufacturer.

[Vysakh9292]

1.) What is the small notch in a fuse for?

Answer: Rejection Notch

2.) Which has the greatest TIME difference?

Answer a.) Extremely inverse



6.) What is the highest pickup for a low voltage-480 system ground?


Answer: d.) 1200 A

[Vysakh9292]

The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is

A. 20,000
B. 100,000
C. 200,000
D. 1,000,000

[Vysakh9292]

A 12 k resistor, a 15 k resistor, and a 22 k resistor are in series with two 10 k resistors that are in parallel. The source voltage is 75 V. Current through the 15 k resistor is approximately

[A]. 14 mA
[B]. 1.4 mA
[C]. 5 mA
[D]. 50 mA

[Gage1374]

[QUOTE=A_Powers1992;13879]To Whom it May Help:

Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not pass....AGAIN. 406/410. 4 points!!! Third time is charm right? Ugh! Best of luck to you all. You're gonna need it.

1.) What is the small notch in a fuse for?




3.) If a motor and chain are present on an OLTC, once the tap is raised to the highest level and it's still giving a raise signal, what should the OLTC motor do?

a.) motor stop, stay at raised level
b.) motor continue til raise signal is gone
c.) motor continue in reverse til back to neutral
d.) motor stop, cool down

4.) Which XFMR test has the ability to magnetize the windings?

a.) Power Factor
b.) TTR
c.) Excitiation
d.) Zero sequence impedance



6.) What is the highest pickup for a low voltage-480 system ground?

a.) 600 A
b.) 800 A
c.) 1000 A
d.) 1200 A


10.) Testing motor circuits would best be achieved by use of?

a.) Ohmmeter
b.) Phase-angle meter
c.) Ammeter
d.) ???


1) The small nipple on a fuse is to ensure correct sized fused is used.

3) a.) motor stop, stay at raised level

6) d.) 1200 A

10) a.) Ohmmeter