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  1. V

    Spinup #211 three phase fault

    Spin-Up Question #211 "Which are the equivalent Circuits for a three phase fault? Here is the circuit that they give it the answer. According to the symmetrical components by blackburn book this is a three phase to ground fault not a three phase fault. The zero sequence network should be left...
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    How to under stand NEC Table 230.51(C)

    I was working the Spin-Up problem 1-67 and I don't understand how to read NEC Table 230.51©, is this a miss print?
  3. V

    Industry Standard of Lagging is it positive or negative?

    So I have been trying to understand ABC and ACB rotation relative to CW or CCW rotation and which is positive degrees and which is negative in degrees and if lagging is considered positive or negative direction as well. I did find this website http://www.marcspages.co.uk/pq/3120.htm that helped...
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