Name: NEMA ST 20:2014
Brand: NEMA

NEMA ST 20:2014

Superseded

View Superseded by

Dry Type Transformers for General Applications

Superseded date

03-29-2023

Published date

12-06-2022

Publisher

National Electrical Manufacturers Association

Foreword
Scope
Section 1 - REFERENCED STANDARDS AND DEFINITIONS
Section 2 - RATING STANDARDS
Section 3 - DESIGN AND MARKING
Section 4 - TESTING
Section 5 - APPLICATION
Section 6 - INSTALLATION
Section 7 - MAINTENANCE
Appendix A - LOADING
Appendix B - UNITED STATES EFFICIENCY REGULATIONS

Applies to single-phase and polyphase dry type transformers (including both autotransformers and noncurrent limiting reactors) for supplying energy to power, heating, and lighting circuits.

DocumentType	Standard
PublisherName	National Electrical Manufacturers Association
Status	Superseded
SupersededBy	NEMA ST 20:2021

IEEE 241 : 1990	ELECTRIC POWER SYSTEMS IN COMMERCIAL BUILDINGS
UFC 3-520-01 : 2015	UNIFIED FACILITIES CRITERIA - INTERIOR ELECTRICAL SYSTEMS
MIL P 29183 : B	PANELBOARD, POWER DISTRIBUTION PORTABLE WEATHERPROOF, GENERAL SPECIFICATION FOR
ASHRAE 90.4 : 2016	ENERGY STANDARD FOR DATA CENTERS
MIL-DTL-29183 Revision C:2003	PANELBOARDS, POWER DISTRIBUTION, PORTABLE, WEATHERPROOF, GENERAL SPECIFICATION FOR
CSA C22.2 No. 47 : 2013	AIR-COOLED TRANSFORMERS (DRY TYPE)
NEMA TP 2-2005	STANDARD TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF DISTRIBUTION TRANSFORMERS
NEMA TR1 : 2013	TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS
IEEE C57.110-2008 REDLINE	IEEE Recommended Practice for Establishing Liquid-Filled and Dry-Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents
IEEE C37.302-2015	IEEE Guide for Fault Current Limiter (FCL) Testing of FCLs Rated above 1000 V AC

NEMA TP 1-2002	GUIDE FOR DETERMINING ENERGY EFFICIENCY FOR DISTRIBUTION TRANSFORMERS
IEEE C57.12.01-2015 REDLINE	IEEE Standard for General Requirements for Dry-Type Distribution and Power Transformers
ANSI S1.4 : 1983	SPECIFICATION FOR SOUND LEVEL METERS
NEMA 250 : 2014	ENCLOSURES FOR ELECTRICAL EQUIPMENT (1000 VOLTS MAXIMUM)
IEEE C57.96-2013	IEEE Guide for Loading Dry-Type Distribution and Power Transformers
IEEE 4-2013	IEEE Standard for High-Voltage Testing Techniques
IEEE C2-2017	NATIONAL ELECTRICAL SAFETY CODE (NESC)(R)
IEEE 142 : 2007	GROUNDING OF INDUSTRIAL AND COMMERCIAL POWER SYSTEMS
NFPA 70 : 2017	NATIONAL ELECTRICAL CODE
CFR 10(PTS400-499) : JAN 96	ENERGY
IEEE C57.12.70-2011	IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers
IEEE C57.12.91-2011	IEEE Standard Test Code for Dry-Type Distribution and Power Transformers
IEEE C57.94-1982	IEEE Recommended Practice for Installation, Application, Operation, and Maintenance of Dry-Type General Purpose Distribution and Power Transformers
NEMA TP 2-2005	STANDARD TEST METHOD FOR MEASURING THE ENERGY CONSUMPTION OF DISTRIBUTION TRANSFORMERS