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BebeshKing

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BebeshKing last won the day on March 8

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About BebeshKing

  • Rank
    Project Engineer

Previous Fields

  • Engineering Field
    Electrical
  • License
    EIT
  • Discipline
    Electrical

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260 profile views
  1. if you are talking about watts per square area or the Lighting power density, that should be under the Energy Code and ASHRAE 90.1. Our HVAC engineer typically calculate those for his energy calculations.
  2. With 31 weeks until the exam, I plan studying at least an hour on weekdays and at least 3-4 hours on weekends. Might be the right time to visit those thick books that I never opened.
  3. I have this book, IEEE green book 1982 version. Is this okay as a reference for grounding and lightning protection? I believe this is the older version. Is this going to be an issue?
  4. That I would definitely do at this moment. I'll take a break from studying, enjoy the thing that I typically do , and spend time with family. I would still study but not as much as I do at the past 5 months.
  5. NCEES canceled the exam for april 2020. so frustrating....!! 😞
  6. So if the given is the circuit power factor, we need to use the approximate formula(per NEC)? And if the given is the load power factor, we need to use the complex number formula ? If I understand this problem correctly, the 0.75 pf is the load power factor and we need to use the complex number formula and the answer would be 1.13V?
  7. This was not a multiple choice question, though. In any way, I just want to know the concept for this. Also, In the NCEES #129 solution , they used the complex number formula but did not consider the real part of the voltage drop to get the voltage at the load side. Little confuse. 😞
  8. @Dude99, So you were saying if we encounter this type of problem and we use the complex number formula, the answer would be the Real part of the Volt drop?
  9. @Chattaneer PE, I asked this because I encountered a problem that I used both formulas (complex number vs approximation formula) to compare each other but the answer is way far from each other. Here's the problem: An 90 foot circuit provides power to a single phase load connected to a 120V panel. The conductor size is 1AWG uncoated copper ran in PVC conduit. Calculate the voltage drop in volts if the amps drawn by the load is 40 with lagging power factor at 0.75. Here's what I did: Using complex number: Vdrop= 2(R+jXL)(I<theta) = 2(0.15+j0.046)(90/1000)(40<-41.4)=1.13<-24.4 volts Using approximate formula: Vdrop=2(Rcos(theta)+XL(sin(theta))(I)=2(0.15(0.75)+0.046(0.66))(90/1000)(40)=1.03 volts what's your thought about this?
  10. @Chattaneer PE, what situation we can use the voltage drop equation in complex number? Vdrop =(R+jXL)(I<theta) ?
  11. If I see a problem with Wye-3phase-3w system, I usually covert it to delta so that VL will be equal to Vphase. But for this problem, the configuration at the source does not matter weather it is a Wye or a Delta.
  12. I'm a first time exam taker, and I just recently bought a reference books in power electronics, and protective relaying. This is for the reason of covering myself with a qualitative questions that I am not familiar with. These books will be my last thing to open during the exam since I will not be familiar with it.
  13. Oh sorry. Didn’t know it was an angry emoji. It supposed to be a “confuse” emoji.😵 peace!✌️
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