IEEE C57.12.25-1990 pdf free.Pad-Mounted,Compartmental-Type,Self-Cooled,Single-Phase Distribution Transformers with Separable Insulated High-Voltage Connectors; High Voltage,34 500 GrdY/19 920 Volts and Below; Low Voltage,240/120 Volts; 167 kVA and Smaller Requirements. IEEE C57.12.25 Voltage ratings shall be in accordancewith Table i...