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Okay, don't understand the solution to this one. It wants to know the pahse to neutral value of the complex impedance of a 400 kcmil, 75 deg cable at 500 ft. I used table 9 of the NEC to get the resistance and reactance. Then I did the following: Z=(0.035+0.049j)(500/1000)(2) , where the...

For those who don't have the book: A 60 Hz, three phase, 208 V system carries a total load of 200+j150 VA. What is most nearly the total capacitance required to correct the power factor? A) 0.001 uF B) 5 uF C) 9 uF D) 500 uF I used the equation Xc = V2 / Q, but the book had Xc = (sqrt 3)...

I'm planning to take the Power PE Exam in October 2012. My reference material is: Electromechanical Energy Devices and Power Systems by Yamayee (this has been a great help) Power Reference Manual for Electrical and Computer PE by Camara (seems okay) Ugly's NEC NCEES Sample Questions What...

We are given VAB as 13.2 kV for a 3 phase, 4 wire, wye connected utility line. Two loads are placed between line A to N and B to N. So, we are going to need to convert the line voltage VAB to phase voltages. I understand the sqrt 3, but why would VAN be at an angle of -30 degrees, and VBN be...

The answer requires the following equation: I= S/(V*sqrt3) Why and when is the sqrt 3 used? In the problem, you have the line voltage, so if anything, I would assume you would divide V by the sqrt 3 to get phasze voltage. Any help is appreciated.

Can someone help by explaining the solution? First, I don't understand the paths for B and C. If the path for B is 1, then I would expect C to be 2. Or, if C is 3, then I would assume B to be 2. From there, I understand how they took the ratio 1:3 to be 1/4 for B and 3/4 for C. But as I...