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  1. Zach Stone P.E.

    Passed PE Power Exam

    Congrats on passing the PE exam @no_concentrate !!! Thanks for being a member of our online class for the new CBT format of the Power PE Exam 🎉
  2. Zach Stone P.E.

    Power PE- Transformer impedance referred to Pri and Secondary

    If I am understanding your question correctly, then the answer is because when we use percent impedance (Z%) to calculate the impedance of the transformer on either the primary or secondary side, the resulting impedance value is the total referred impedance which is the sum of the impedance...
  3. Zach Stone P.E.

    Power PE- Transformer impedance referred to Pri and Secondary

    Hi @CeeYem, The change of base formula for the per-unit system is not used here. The referred impedance formulas are derived from the transformer ratio formula and Ohm's law. Here is a quick sketch off the top of my head to help demonstrate:
  4. Zach Stone P.E.

    Jacob PASSED the Electrical Power CBT PE Exam (after two failed attempts!) July 2021

    Many of you have been asking for an interview with an engineer that had to take the PE exam more than once so you can learn exactly what they did differently in order to pass. This week I had the opportunity to speak with Jacob about how he did just that after two previous failed attempts...
  5. Zach Stone P.E.

    Power PE 61

    The instantaneous overcurrent trip function typically operates with a time setting (or cycle setting) of zero. In other words, the current is so great, that the relay should trip the OCPD immediately without a time delay.
  6. Zach Stone P.E.

    Planning on taking CBT, studying advice

    Hi @mnsee glad to see our practice exam in your list! If you're looking for advice and personal experience from other power engineers that have passed the new CBT format of the Power PE exam this year, take a look at the following youtube playlist: Youtube - "How to Pass the CBT PE Exam"...
  7. Zach Stone P.E.

    PE Electrical Power Reference Handbook 1.1.2 Effective beginning October 1 2021

    Luckily nothing major. Mostly minor corrections, the addition of titles where they were missing, and a few variables that were re-labeled. No one panic! It's the same reference handbook :D
  8. Zach Stone P.E.

    How to Solve Transformer Open and Short Circuit Test for the CBT Electrical Power PE Exam (Electrical PE Review)

    Transformer Open and Short Circuit Test - Example Problem: Tonight is Live Class #3 - Transformers for the new CBT format of the Electrical Power PE Exam. To help you solve transformer open and short circuit test problems, here is a new 30 minute YouTube video from last semester's...
  9. Zach Stone P.E.

    How to Solve Transformer Open and Short Circuit Test for the CBT Electrical Power PE Exam (Electrical PE Review)

    Transformer Open and Short Circuit Test - Example Problem: Tonight is Live Class #3 - Transformers for the new CBT format of the Electrical Power PE Exam. To help you solve transformer open and short circuit test problems, here is a new 30 minute YouTube video from last semester's...
  10. Zach Stone P.E.

    July Exam Takers

    Congrats @jsk020 !
  11. Zach Stone P.E.

    Selling Electrical Power PE Study Materials

    Hi @CynicalTechHumor, happy to see our practice exam on your list. How did it compare to the others that you used, and did it help you prepare for the PE exam? Bummer about the ikea table :)
  12. Zach Stone P.E.

    NCEES #136

    The power factor comes out to zero only when the load is either 100% capacitive (-jX = -90º) or 100% inductive (+jX = +90º). Ex: PF = cos(ø) PF = cos(90º) or cos(-90º) PF = 0 You can tell if it is lagging or leading by the impedance. Capacitive loads have a negative j in front of the...
  13. Zach Stone P.E.

    NCEES Question #510

    The 1.15 FLC multiplier comes from NEC® 430.32(A)(1) Continuous-Duty Motors Separate Overload Device.
  14. Zach Stone P.E.

    July Exam Takers

    Thanks for the mention @patkt! Congrats again on passing the PE exam. Thanks for the mention @jsk020! Please email me when your results come in so I can follow up with you. Good luck!
  15. Zach Stone P.E.

    How to Solve DC Circuits for the CBT Electrical Power PE Exam

    Live Class #2 - Circuit Analysis for the Fall 2021 Semester starts TONIGHT at: Tuesday, July 13th, 20213 PM (PT), 4PM (MT), 5PM (CT), 6PM (ET) Will you be joining us? Click the thumbnail in the below to watch a short clip of last semester's circuit analysis live class and learn how to solve...
  16. Zach Stone P.E.

    PE Power #8

    It's all about the context clues given in the problem. The problem didn't say there was a load on C-phase. The problem said there was only a load connected A-phase to neutral, and B-phase to neutral: "A complex load of (200+j100)KVA is connected between Phase A and neutral, An identical load...
  17. Zach Stone P.E.

    NCEES practice exam #11

    Sure. This is directly from our live class on circuit analysis:
  18. Zach Stone P.E.

    NCEES Question 530

    Hi Kris, The double forward slash "//" is short hand for parallel, used to indicate adding two terms using the reciprocal of reciprocal sums, such as adding two resistors in parallel: x//y = 1/[(1/x)+(1/y)] Or: x//y = (xy)/(x+y) Even though the bus and transformer are in series, fault duty...
  19. Zach Stone P.E.

    Single-phase transmission line capacitance and capacitive reactance (NEW VIDEO)

    Did you know that the NCEES® Reference Handbook does NOT include the formula for the *total* transmission line capacitance (C)? Are you familiar with the difference between the *line-to-neutral* capacitance (C) and the *total* capacitance (C) of a single-phase transmission line? Grab your...
  20. Zach Stone P.E.

    NCEES RESULTS ARE OUT! POST YOUR RESULTS!

    Big congrats @DuranDuran! You've been really active on the forums so it's great to see that you passed (y) Thanks for the mention and enjoy the great feeling while it lasts.
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