Specifications include, but are not limited to: ) The voltage regulators shall be outdoor, three phase, liquidimmersed step-type padmounted voltage regulators rated for 60 Hertz, 95 kV BIL, 65o C temperature rise. The regulators must be completely self-contained, requiring no outside source of power, and provide + 10% regulation in 32 steps of approximately 5/8% each. Forced air ratings are not acceptable. ; Dielectric fluid shall be natural ester-based that meets the minimum acceptance testing requirements described in the latest edition of IEEE C57.147 ; The tap-changing mechanism shall be of the motor-driven, quickbreak type, and shall be completely oil immersed. 2) An electrical feedback circuit shall be incorporated with the tapchanger motor circuit and control to ensure accurate indication of tap position and number of operations ; Regulators 668 amps and below shall be field-adjustable for extra ampacity at reduced regulation, i.e. “Vari-amp” or “Add-amp”. The extra ampacity shall not exceed 668 amps.