When spec-ing out conductors (to be installed in rigid metallic conduit) for a 4160 volt 3 phase AC motor with normal torque characteristics, when does one need shielded conductor? What are the ramifications of shielded vs. non-shielded at this voltage? Also, the NEC does not have full load currents for 3 phase AC motors over 2300 volts in Table 430.250. What is a good reference for amperages of higher voltage motors? TIA.
Brian
Brian