Recent content by bethy

SPD (Selecting Protective Devices) - by Cooper Bussmann This is very helpful for protective coordination

Finally, I pass! WA. I thought I didn't do well on the afternoon, but somehow it was not bad.

Rtaiden, The test was 2011. So it's maybe a error. Would you please give me the answer of those problems with the (+) sign. The one I got the answer goes with th (-) sign. Thanks. I wonder that Josh had post the correct error on the CI website??

Why the voltage drop formula to solve these two problem using the "subtract": V(d) = I * {R*cos(theta) - X* sine(theta)} * L/1000 From table 9, NEC book. It is shown as ( + ). Can some one explain to me please?? Thanks,

I am on the same boat as Nittany_Lion. I studied more than 250 hrs this time. Took the advises from the Board, do all the practices 2-3 times and reading more sources about transmission line and protection. On the morning section, I didn't have enough time to finish it since some of the...

I used the same method. SA = 3x4 = 12 SB = 4x3 = 12 So Gen A should equal to Gen B. SA = SB = 3MVA (can not choose 4MVA since it's overload Gen A). ST = 6MVA (answer C) Thanks to EEVA and Power12 for the MVA fault method. I did the calc wrong on the series capacitors. But I have another...

I like this solution better. The solution from the test takes more more time to calculate. I tried to use this method to solve one of the sample from the NCEES and the answer is easier to understand. Thanks Ivory. There is a couple problems calculating the fault current by using MVA method...

Yeap! I email them yesterday and they said I need to pay $85 more (re-register fee) to access the online video modules again. I did tried to login again last night and still see the video (from big screen) & voice (but the small screen is blank). Don't know why??

Thank you all for your advises! I will try again. Hopefully, Dr Callen can let me watch the online lessons again.

Power. I'am working in MEP consulting too. The score on general power is 66% (I guess it is OK). But score on electronic, electromagnetic and instruments are bad. It is kind of random. The last two exam these sections are scored good. So I don't know what is the best way to study anymore??

Wildsoldier, Can I email you for some question regard to exam materials? Or please email me at: [email protected] Just so frustrated since the more I study the worst score I got??? Follow the advised from the board and took the GA Tech course after 2 times failed. Just don't know what am I...

He (Dr Callen) converted: Vab = -Vba = 200<-30 (That is what I don't get! How to get <-30? I used calculator convert -Vba = -200<150 to get <-30). Vbc = -Vcb = 200<90 Vca = -Vac = 200<210

Let me give you more infor. The problem given: Vac = 200<30 Vba = 200<150 Vcb = 200<270 Find the sequence? How do you convert 200<150 to become Vab = 200<-30 (without using calculator)?

On P-47b & P-47c Sample problem. V(ab) = -V(ba) = 200 angle -30 degree V(bc) = -V(cb) = 200 angle 90 degree V(ca) = -V(ac) = 200 angle 210 degree I used calculator to get the answer from V1, V2, V3 by convert -200 angle 150 degree to rectangler and then convert it back to polar to get...