Line voltage (kV) 138 345 765 Conductors per phase (18-in. spacing) 1 2 4 Number of strands aluminum/steel 54/7 45/7 54/19 Diameter (in.) 0.977 1.165 1.424 Conductor GMR (ft) 0.0329 0.0386 0.0479 Current-carrying capacity per conductor (A) 770 1010 1250 Bundle GMR-R, (ft) 0.0329 0.2406 0.6916 Flat phase spacing (ft) 17.5 26.0 45.0 GMD phase spacing (ft), 22.05 32.76 56.70 Inductance (H/m x 10-7) 13.02 9.83 8.81 XL (Q/mi) 0.789 0.596 0.535 Capacitance (F/m x 10-12) 8.84 11.59 12.78 IX (M-mi to neutral) 0.186 0.142 0.129 Resistance (/mi), de, 50°C 0.1618 0.0539 0.0190 Resistance (/mi), 60 Hz, 50°C 0.1688 0.0564 0.0201 Surge impedance loading (MVA) 50 415 2268 9'10" 55'8" 26'