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About speakeelsy

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    reading, motorcycles, video games, mining

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  1. I was taught that in a motor starter, overloads are to protect your motor, SCCP or OCPD (breaker or fuses) were to protect your wiring. When there is a fault, you get lots of amps which means lots of heat - this is bad. Your breaker or fuses are meant to protect your cables -- which is why you size them based on the cable sizing! Motor overload protection is meant to protect your motor -- that's why it's sized based off your motor.
  2. single phase formulas are different that 3 phase formulas for this. Check out Zach's online course Ch8.7 Transmission Lines. It doesn't really give an explanation though. For more explanation check out Power systems Analysis by Grainger and Stevenson -- Chapter 5.3 Capacitance of a Two-wire line, and 5.4 Capacitance of a Three-Phase Line - it's got the derivation of both formulas! Looks like it all stems from C=q/V for single phase C=q/(Vab/2) divided by 2 because it's capacitance to ground or neutral, so the 2's cancel for 3phase C=q/Van so the 2's don't cancel.
  3. The only thing with the NEC is that I need to remember to read exceptions. I'm pretty comfortable with the index and table of contents though. FE wasn't too bad... I think the AM session was the worst - granted I took it in 2012. For this I'm definitely worried more about being asked a conceptual question that I have no idea about. Power is so darn broad of a subject, and there will be no way to look up anything this round.
  4. @akyip, @SparkyBill, @Byk Thanks so much! Good luck to ya'll too! This right here! So many things. I developed so many formula sheets for myself. I would love to have my own notes on the unsymmetrical fault current analysis stuff. I'm not great at deriving things on the fly (especially while nervous), and I would love to have my sheet for this instead of the teeny diagrams in the reference handbook.
  5. EIT and PE exams are nationally recognized. So you should just have to apply with the state's board you want to be licensed in. If you are already licensed in OR, then you should apply for comity in WA. I'd suggest contacting the state's board of engineers on what you need and how to apply for licensing in their state.
  6. I took the EngProGuides Final exam yesterday. Finished the AM session with about 15 minutes left on the clock, went a little over on the PM session, but i got majorly stuck on 3 questions, that i spent a while reworking to get them correct. (probably lost like 30-45 minutes here... cause I was on track to finish early before that) Going to go over what i missed later this week. This morning I worked on the AM session of CRAM 2 (didn't time it though)--- i feel like the conceptual questions are good in the CRAM exams, but to me CRAM 1 seems like it matches the NCEES guidelines the best.
  7. The live class session for October was really nice because Zach ended up included a lot of the handbook stuff, plus I enjoyed having something to keep me on a schedule and motivated. (there were a few weeks this round when the only studying I did were live class related 🙃) Definitely recommend going through the live class as many things are in the live class that aren't in the online course.
  8. Lucky you! My work load has tripled since the quarantine, and I've been putting a lot more time in on the job - which has left a lot less time for studying. But I feel like after doing a lot of the initial studying for the April exam, I was a lot more comfortable with all the subjects during this October/December round. Currently I'm struggling with unsymmetrical component and fault analysis combination problems, and need to spruce up my skills with a few other assorted subjects, either way I feel like I've learned a ton this year. Just super burnt out. I'm a huge believer in drawing
  9. @akyip you're fast!!! my times have varied a lot, and I've been solving tests straight through this time, only skipping if i don't know what it's asking immediately, or if I can tell it's a very involved problem. At the beginning I still had 7-14 questions left at 4hrs, but now i'm getting completed with time to spare. (yay improvement) NCEES i finished with about 15min to spare the last time i took it. The 2nd time i took Zach's test i split up between days, and i think i ended up getting called by work in the middle of the afternoon session, but it was very close t
  10. @SparkyBill This stuff does take a bit of headscratching to figure out, I spent a while translating between Zach's notes, the handbook, and that whitepaper, until it finally clicked! Interpreting what the questions are asking is going to be up to you, but I've written a bit more of a plain words explanation below for you that will hopefully help with these types of problems! Here's a little more of an explanation of what you are figuring with the two equations above. So with my analysis above, what you're doing is maxing out the load on one transformer, and finding the
  11. @SparkyBill Sorry I didn't elaborate earlier, I was headed out of the house. The restrictions go with the formulas. but they will also work for 3 phase too. I don't know why they've restricted it to 1 phase transformers. Granted your problem up there doesn't specify what kind of transformer. 😉 With the handbook formulas, you can also make the ones like this: SL1 = SL2* ((ZT2%)*ST1) / (ZT1%)*ST2) SL2 = SL1* ((ZT1%)*ST2) / (ZT2%)*ST1) First solve for SL1 using SL2 = ST2... because you know you'll be maxing out 1 transformer, but you need to figure out which
  12. Yup. Top of page 60 in the handbook - you'll have to rearrange the formulas a little bit.
  13. I agree with you @akyip as I also chose 40Amps as the answer to this question based on the same reasoning. @Cram For The PE Do you have any input on this?
  14. Current transformer, not regular transformer! 200A is the line current. So Ipri/Isec = Npri/Nsec Isec = Ipri(Nsec/Npri) Isec = 200A(5/200) = 5A Then Ohms Law it V=IR V =5A*1ohm =5V
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