IEEE Std C57.12.20-2011
Overhead-Type Distribution Transformers 500 kVA and Smaller: High Voltage, 34500 V and Below; Low Voltage, 7970/13 800Y V and Below

Standard No.

IEEE Std C57.12.20-2011

Release Date

2011

Published By

Institute of Electrical and Electronics Engineers (IEEE)

Status

Be replaced 2017-11

Replace By

IEEE Std C57.12.20-2017

Latest

IEEE Std C57.12.20-2017

IEEE Std C57.12.20-2011 history

• 2017 IEEE Std C57.12.20-2017 IEEE Standard for Overhead-Type Distribution Transformers 500 kVA and Smaller; High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
• 2011 IEEE Std C57.12.20-2011 Overhead-Type Distribution Transformers 500 kVA and Smaller: High Voltage, 34500 V and Below; Low Voltage, 7970/13 800Y V and Below
• 2008 IEEE Std C57.12.20/INT 1-2008 IEEE Standards Interpretation for IEEE Std C57.12.20? -2005 IEEE Standard for Overhead-Type Distribution Transformers, 500 kVA and Smaller: High Voltage, 34 500 V and Below; Low Voltage, 7970/13 800Y V and Below
• 2005 IEEE Std C57.12.20-2005 Overhead-type distribution transformers, 500 kVA and smaller: High voltage, 34500 V and below - Low voltage, 7970/13800Y V and below
• 1997 IEEE C57.12.20-1997 Standard for Overhead Type Distribution Transformers@ 500 kVA and Smaller: High Voltage@ 34500 Volts and Below: Low Voltage@ 7970/13800Y Volts and Below (Replaces NEMA C57.12.20-1997)
• 1988 IEEE C57.12.20-1988 Transformers - Overhead-Type Distribution Transformers@ 500 kVA and Smaller: High Voltage@ 34 500 Volts and Below; Low Voltage@ 7970/13 800Y Volts and Below (Now Copyrighted by NEMA)
• 1981 IEEE C57.12.20-1981 REQUIREMENTS FOR OVERHEAD-TYPE DISTRIBUTION TRANSFORMERS@ 500 KVA AND SMALLER: HIGH- VOLTAGE@ 67 000 VOLTS AND BELOW; LOW-VOLTAGE@ 15 000 VOLTS AND BELOW
• 1974 IEEE C57.12.20-1974 Requirements for overhead-type distribution transformers@ 67 000 volts and below; 500 kVA and smaller