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  1. C

    DY turns ratio / Spin-up #3-60

    For a D-Y (Delta-Wye) transformer, does turns ratio refer to the actual turns ratio (and VLL-to-VLN), or to VLL-to-VLL ("apparent turns ratio")? The problem requires a calculation of low-side voltage, through a D-Y transformer with 10:1 turn ratio. High-side voltage is 4600 Volts. The...
  2. C

    AC Resistance & Reactance of SINGLE conductor? (NEC)

    NEC TABLE 9: Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75 C - Three Single Conductors in Conduit Stupid Question: What about AC SINGLE-PHASE (Single) Conductors? Is there a table? Thanks!
  3. C

    NCEES 510

    I thought we multiply by 1.25 to get the FLA of a CD (continuous duty) motor, but that doesn't appear to be the case. When do we multiply by 1.25? And why don't we here? So I calculated: 65 Amps x 1.25 x 1.15 = 93.4 Amps (65 Amps from NEC Table 430.250) (1.15 from NEC 430-32a1) The correct...
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