Search results

Professional Engineer & PE Exam Forum

Help Support Professional Engineer & PE Exam Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. A

    PE power reference 4 sale

    sold
  2. A

    PE power reference 4 sale

    no drill book. I didn't receive you PM. However I PM you a second ago.
  3. A

    PE power reference 4 sale

    I passed Oct 2016 exam on 1st try after many years out of school. I don’t use a lot of reference, however I tried my best to compare and categorize each problem, I went over each book 3-4 times. During the exam I can quickly figure it out the right approach. I hope my experience will help you...
  4. A

    I failed October 2016 Power PE - please assist

    I just received pass confirmation on 1st try after many years out of school. Your reference is good enough, no need more. You may need create a cheating sheet, not only formulas, but also hint for solving different type problem, for instance, "transmission and distribution" subject you get the...
  5. A

    Graffeo Ex 7

      Mr. Alex Graffeo
  6. A

    Graffeo Example 50

    ask Alex the difference 49 and 50, here is the reply: Yes, It is because it is a 3 Phase fault.  In the most recent printing I added a note:   With that assumption, there would not be a negative sequence component for the 3-ph fault and we get:     Also, in case it's not in your...
  7. A

    Graffeo Ex 7

    ask Alex and get clarification 
  8. A

    Graffeo Ex 7

    how does the load current IAB= source current Iab, and the current pass ZLN is equal to  √3 Iab ?
  9. A

    Motor CB size (NEC question)

    thank you so much, knight! you helped me a few questions  :thankyou:
  10. A

    NCEES Problem 513

    hope helps
  11. A

    Anyone received exam authorization yet from NCEES yet for OCT 16 exam?

    got it
  12. A

    Motor CB size (NEC question)

    see below figure. 5-hp FLA is 7.6, 15-hp is 21, 40-hp motor is 52 based on 2008 NEC 430.62(A), then 7.6+21+52*1.25=93.6 based on 2008 NEC 430.152, the branch circuit protective device for the 40 hp motor is 250%*52=130..... I don't have 2008 NEC, what's 430.152? I can't find similar thing in...
  13. A

    Anyone received exam authorization yet from NCEES yet for OCT 16 exam?

    no
  14. A

    NEC Table 310.15(B)(2)(a) and (b)

    I need new glasses :reading:
  15. A

    NEC Table 310.15(B)(2)(a) and (b)

    If I have rated 90 degree #12 THHN runs in ambient 55 degree, the capacity is 30A based on 310.15(B)(16). Because it is used in 55 degree, the factor need to multiply. If use (a), the factor is 0.76, however if use (b), the factor is 0.84, which one shall I use?
  16. A

    Graffeo Example 31

    not sure it is right. On Graffeo pg. 13, the 30 degree is in wye, Line-Line convert to Line-Neutral, not converting y to delta. 
  17. A

    NCEES #111

    totally agree! in this delta connection, its phase voltage is also 12.5kv, so no √3 need to be divided by, mistake! We have to use line-neutral, line-line term. 
  18. A

    Graffeo Ex 14

    if you add 2 impedance firstly, how to get the current? 120V is the 10+j8 voltage, not for both.
  19. A

    difference NEC Table 310.15(B)(16) and (17)

    thanks, free air seems to be wire/cable is not in tray, conduit... I assume it runs in short distance because there is no support. 
  20. A

    difference NEC Table 310.15(B)(16) and (17)

    the table in NEC2014 is always referenced to find out the conductor capacity. I am still not sure the difference by reading the title of table.
Back
Top