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  • Jrmcritical's Avatar
    2 Days Ago
    While I'm not yet a level II technician, all the guys I work with say that the neta ATS and MTS specifications are practically the bible to the level II examination. Assuming you've taken OSHA 30 and NFPA70E within the past 2 years, I wouldn't focus much on safety as I hear the safety questions are nearly all common sense.
    1 replies | 958 view(s)
  • Jrmcritical's Avatar
    2 Days Ago
    I'd imagine the reason this was marked wrong is because it has the word "Control" vs. the word "Containment". The first two reasons that pop into my head are energy containment and isolation, and the second thing that pops into my head is separation of services / systems. Do you remember the answer choices you could choose from?
    1 replies | 1374 view(s)
  • Jrmcritical's Avatar
    2 Days Ago
    The answer would definitely be bolted pressure switch as its one of the few switches that can handle a high ampacity and be built to withstand a 200kAIC fault current.
    4 replies | 2418 view(s)
  • Jrmcritical's Avatar
    2 Days Ago
    Funny you bring that up. A particular hospital that we do work for in NYC does not allow that signage or verbiage and will actually remove the pages from their arc flash analysis when this condition exists (which is quite common, as the utility coming in in manhattan contributes around 200kA of fault current. It was explained to me that by posting the ...
    2 replies | 3353 view(s)
  • Jrmcritical's Avatar
    2 Days Ago
    I like where you're going with the possibility of DC current being the reason for a heightened risk of flashover, and thinking about it more in depth it makes sense. For example, think of any capacitor. It allows you to "Store" DC current. So, let's take a power factor test to its most basic form - an insulation resistance test. As were turning a conductor...
    5 replies | 521 view(s)
  • SecondGen's Avatar
    2 Days Ago
    Easy way to calculate: A2 + B2 = C2 750,000 = C2 750,000 x 0.95 = 712,500 = A2 750,000 - 712,500 = 37,500 = B2 sqrt(37,500) = 193.64
    3 replies | 421 view(s)
  • cbrazzil's Avatar
    2 Days Ago
    We asked all techs that go through our new study program, that take the test, to write down any questions that you can remember down as soon as you can while its fresh on your head. Reviewing our practice test helps jogs your memory. We try and understand what the core concepts NETA really wants you to know and learn it. We try and start our study groups 2...
    3 replies | 421 view(s)
  • Warrengarber's Avatar
    2 Days Ago
    I agree with the difficulty of this test. I have no idea how you remembered so many questions when you finished!! Amazing. After reading through them I had quite a few of them on my exam also. Some were worded differently but the idea of the question was the same. #46 was exact and I bet I wasted 10min on this problem. The adding of KVAR was not...
    3 replies | 421 view(s)
  • SecondGen's Avatar
    3 Days Ago
    I asked the exact same question to the crew today. Only thing I could think of is that the vacuum pressure is much, much greater in a bottle than a transformer. Now what I wonder is: if a flashover can occur at 250V when testing under vacuum, why doesn't it occur at 35kV in normal operation when the transformer is under vacuum?
    5 replies | 521 view(s)
  • Kalbi_Rob's Avatar
    3 Days Ago
    And this always brings up a question that I've never could answer. If flashover happens in transformers under vacuum, why is this different than a vacuum circuit breaker? As the salient feature of vacuum as an arc quenching medium is that as soon as the arc is produced in a vacuum, it is quickly extinguished due to the fast rate of recovery of the...
    5 replies | 521 view(s)
  • SecondGen's Avatar
    3 Days Ago
    Excellent document, thanks for this. Screenshot below for those interested.
    5 replies | 521 view(s)
  • Jrmcritical's Avatar
    3 Days Ago
    In theory, it 'shouldn't' have any effect on power factor as power factor is simply a capacitance measurement. With that said, under no circumstances should this test ever be performed under vacuum, as it can greatly (and gravely) increase the chances of flashover. I've attached Megger's "Application Guide for Power Factor Testing of Power And...
    5 replies | 521 view(s)
  • Jrmcritical's Avatar
    3 Days Ago
    I'm sure this post will seem very redundant to some, but one can never reiterate enough the importance of testing prior to energizing. Just within the past two weeks, we were called to two different sites to assess equipment which failed either upon startup or during the commissioning process. Site 1: We were called to the "scene" of a newly...
    0 replies | 297 view(s)
  • SecondGen's Avatar
    3 Days Ago
    What effect, if any, does negative tank pressure have on transformer power factor? I've never known of it being an issue but another tech on site seems to remember hearing it in a PF seminar. Thoughts??
    5 replies | 521 view(s)
  • cbrazzil's Avatar
    4 Days Ago
    This exam was harder than the previous one. It asked more practical field questions than straight and direct questions. Multiply: magnitude 15 at 30 degrees and magnitude 20 at 60 degrees. Why is a ground grid extended beyond the main system? By bonding the wire and the moving equipment together, the individual on the equipment is not exposed and...
    3 replies | 421 view(s)
  • SecondGen's Avatar
    1 Week Ago
    I know the feels. I failed the 3 my first time and had to wait anxiously for 6 months before getting another shot. Keep at it, with enough persistence and desire it's only a matter of time.
    1 replies | 1161 view(s)
  • SecondGen's Avatar
    1 Week Ago
    Count me in. I'm on Eastern time.
    4 replies | 332 view(s)
  • rofo42's Avatar
    1 Week Ago
    I would like to get in on the study group.
    4 replies | 332 view(s)
  • Warrengarber's Avatar
    1 Week Ago
    Great! Lets wait and see if there are any others interested and then we can figure out times and days. Thanks
    4 replies | 332 view(s)
  • ironshovel77's Avatar
    1 Week Ago
    sounds like a great idea to me, i have been studing for my neta 3 off and on. let me know the details thanks
    4 replies | 332 view(s)
  • Warrengarber's Avatar
    1 Week Ago
    I have been given access to start a study group on Discord for test prep. I am thinking once or twice a week we meet and discuss topics and learn together as a group. It would be nice to have level three of four techs also involved to share there knowledge to help us all achieve our goals. The timing will be the main issue with people from many different...
    4 replies | 332 view(s)
  • Warrengarber's Avatar
    1 Week Ago
    Last night I really thought I would be posting a picture of a "PASS" on my Facebook page along with an apology to my friends and family for completely neglecting them for the past month. Instead it was a picture of a bottle of Absolute, a fresh lime and a Netflix movie. That feeling when you hit that last review button and all you see in all caps is FAIL...
    1 replies | 1161 view(s)
  • Kalbi_Rob's Avatar
    1 Week Ago
    There are still variant configurations for Delta to Delta: Dd0, Dd2, Dd4, Dd6, Dd8, and Dd10. Sometimes this can be read on the nameplate, but most of the time you just have to use the back of the manual associated with the ttr. Also, if this is a Dry-type transformer, take a look at the actual tap changer. On some, they have nice screw holes which...
    8 replies | 2254 view(s)
  • Warrengarber's Avatar
    1 Week Ago
    It all depends on the customer and the location. I am in Florida and the customer owns from the transformer to the building. That said most customers do not think of testing the feeders unless they have had issues in the past. I just had a project where the customer scope included testing the main feeders, because they lost a set a couple of years ago,...
    4 replies | 801 view(s)
  • Warrengarber's Avatar
    1 Week Ago
    I agree a with Secondgen and would exercise extreme caution. If you contact the test set manufacture and explain the scope of the testing they should be able to get you the information that they need. If you are doing a three point fall of potential test I would think you would be ok but with the two point direct method the DLRO is actually using the...
    4 replies | 545 view(s)
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