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C57.12.57-1987  -  American National Standard for Transformers - Ventilated Dry-Type Network Transformers 2500 kVA and Below, Three-Phase, With High-Voltage 34 500 Volts and Below, Low-Voltage 216Y/125 and 480Y/277 Volts - Requirements

Reaffirmed  1992
StatusInactive  -  Superseded

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