Remembered NETA 2 Questions 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 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 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...ical-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.