15 kV, Max phase-to-ground 8.3 kV, AC 1 min:34 kV, DC 15 min:34 kV, Impulse:95 kV, Max corona:11 kV, Test: Yes, 0.75 inch, 1.08 inch, 19.1 mm, 27.4 mm, 4/0 AWG, 250 AWG