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We have to forget 30° phase shift between line and phase voltage in wye, and conjugate of the phasor (200+j100)/7.62∠0° + (200+j100)/7.62∠120° =224∠26.6°/7.62∠0° + 224∠26.6°/7.62∠120° =29.4∠26.6° + 29.4∠-93.4° =29.4∠-33.2°

the answer 34A is not counted 93% efficiency, why? it will be 36.6A. I did a few same problems, efficiency are all counted.

nice! When calculate apparent power, S=V∠a◦ x I∠b◦, the final result is UI∠ (a-b)◦

the formula to change the base is  Znew-pu = Zold-pu *(SBASE-NEW / SBASE-OLD) * (VBASE-OLD / VBASE-NEW)2 , but based on ZB = (VB)2/SB , the formula shall be upside down like Znew-pu = Zold-pu *(SBASE-OLD / SBASE-NEW) * (VBASE-NEW / VBASE-OLD)2 Right?

When I use MVA method instead of PU method, the result is different. Do I miss something?  ILoad = 120∠0° / (10+j8) = 120∠0° / 12.8∠38.7° = 9.4∠-38.7° Q = I2Z = 9.4∠-38.7° * 9.4∠-38.7° * (1+j3+10+j8) = 88.4∠-77.4° * 11√2∠45° = 1375.2∠-32.4° = 1161.1-j736.9. So the active power is 1161.1 and...

Thanks all!

Try to work on more practice exam, any suggestion? Does CI NEC Drill book helps? Thank you! 

Thanks you!!!

Thanks! I am think consulting firms too, but I don't feel job secured. I was working for a consulting, and lost job during the recession, that is why I prefer utility, even low starting salary.

Thanks! You path is to gain experience then licensed, but my path could be licensed firstly, then try to get a job w/o related experience, do you think possible?

I am thinking of working for utility company. I have no experience with power transmission, substation, relay protection...my current experience is PLC automation for long period time. This industry is not stable comparing to utility, and this industry doesn't require PE license as long as you...