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NEMA TR 1 - TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS Organization: NEMA
Date: 2013-01-01
Description: This standards publication applies to single phase and poly phase power and distribution transformers (including step-voltage regulators and reactors). This standard excludes dry type transformers covered by NEMA ST20.
CSA C22.2 NO 66.1 - LOW VOLTAGE TRANSFORMERS - PART 1: GENERAL REQUIREMENTS - FIRST EDITION; UPDATE NO. 1: NOVEMBER 2012; UPDATE NO. 2: DECEMBER 2013 Organization: CSA
Date: 2006-01-01
Description: Preface This is the harmonized CSA Group and UL standard for low voltage transformers. It is the first edition of CSA C22.2 No. 66.1 and the first edition of UL 5085-1.
UL 5085-3 - UL STANDARD FOR SAFETY LOW VOLTAGE TRANSFORMERS – PART 3: CLASS 2 AND CLASS 3 TRANSFORMERS - FIRST EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING NOVEMBER 30, 2012 Organization: UL
Date: 2006-04-17
Description: As noted in Low Voltage Transformers – Part 1: General Requirements, UL 5085-1, or CSA C22.2 No. 66.1, Low Voltage Transformers – Part 1: General Requirements, the requirements in Part 3 cover Class 2 transformers for use with Class 2 circuits in accordance with the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, Part I, CSA C22.1.
CSA C22.2 NO 66.3 - LOW VOLTAGE TRANSFORMERS - PART 3: CLASS 2 AND CLASS 3 TRANSFORMERS - FIRST EDITION; UPDATE NO. 1: NOVEMBER 2012 Organization: CSA
Date: 2006-04-17
Description: As noted in Low Voltage Transformers – Part 1: General Requirements, UL 5085-1, or CSA C22.2 No. 66.1, Low Voltage Transformers – Part 1: General Requirements, the requirements in Part 3 cover Class 2 transformers for use with Class 2 circuits in accordance with the National Electrical Code, ANSI/NFPA 70, or the Canadian Electrical Code, Part I, CSA C22.1.
UL 5085-1 - UL STANDARD FOR SAFETY LOW VOLTAGE TRANSFORMERS - PART 1: GENERAL REQUIREMENTS - FIRST EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING DECEMBER 06, 2013 Organization: UL
Date: 2006-04-17
Description: The National Electrical Code, ANSI/NFPA 70, defines low voltage as any voltage up to 600 V, nominal. Therefore, low voltage transformers intended for use in Canada may be rated above 600 V up to 750 V.
FAA-E-2791 - TRANSFORMER, DISTRIBUTION, PAD-MOUNTED, FOR LOOPED POWER DISTRIBUTION SYSTEMS WITH HIGH VOLTAGE AT 25KV AND BELOW Organization: FAA
Date: 1989-08-28
Description: These transformers are designed for outdoor installation over a concrete vault or similar structure to provide underground power distribution to FAA facilities via a three-phase, four-wire loop distribution system at various distribution voltages (high voltage hot to exceed 25kV, three-phase, line to line). The transformers shall be either single or three-phase, with primary and secondary wiring connections as specified in 1.1 and as indicated in Figures 1 and 2.
IEEE - ANSI C57.12.22 - TRANSFORMERS - PAD-MOUNTED, COMPARTMENTAL-TYPE, SELF-COOLED THREE-PHASE DISTRIBUTION TRANSFORMERS WITH HIGH-VOLTAGE BUSHINGS, 2500 KVA AND SMALLER: HIGH VOLTAGE, 34 500 GRD Y/19 920 VOLTS AND BELOW; LOW VOLTAGE, 480 VOLTS AND BELOW - REPLACES NEMA C57.12.22-1993 Organization: IEEE
Date: 1993-01-01
Description: This standard and the companion standard on single-phase transformers (ANSI C57.12.21) were prepared by the Subcommittee on Distribution Transformers, Overhead and Pad-mounted, C57.12.2.
IEEE C57.13.6 - STANDARD FOR HIGH-ACCURACY INSTRUMENT TRANSFORMERS Organization: IEEE
Date: 2005-09-22
Description: This standard defines one new 0.15 accuracy class for voltage transformers, two new 0.15 accuracy classes for current transformers, two new current transformer burdens, and two new current transformer routine accuracy test methods.
NEMA - C57.12.21 - PAD-MOUNTED, COMPARTMENTAL-TYPE, SELF-COOLED, SINGLE-PHASE DISTRIBUTION TRANSFORMERS WITH HIGH-VOLTAGE BUSHINGS; HIGH -VOLTAGE, 34 500 GRDY/19 920 VOLTS AND BELOW; LOW-VOLTAGE, 240/120 VOLTS; 167 KVA AND SMALLER, REQUIREMENTS FOR - NOW COPYRIGHTED BY IEEE Organization: NEMA
Date: 1980-01-01
Description: This standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of single-phase, 60-Hz, mineral-oil-immersed, self-cooled, pad-mounted, compartmental-type distribution transformers with high-voltage bushings. These transformers are rated 167 kVA and smaller with high voltages of 34 500 GrdY/19 920 volts and below for operation between one phase and grounded neutral, and low voltages of 240/120 volts.
IEEE - ANSI C57.12.50 - REQUIREMENTS FOR VENTILATED DRY-TYPE DISTRIBUTION TRANSFORMERS, 1 TO 500 KVA, SINGLE-PHASE, AND 15 TO 500 KVA, THREE-PHASE, WITH HIGH-VOLTAGE 601 TO 34 500 VOLTS, LOW-VOLTAGE 120 TO 600 VOLTS - REPLACES NEMA C57.12.50-1981 Organization: IEEE
Date: 1981-01-01
Description: Foreword(This Foreword is not a part of American National Standard Requirements for Ventilated Dry-Type Distribution Transformers, 1 to 500 kVA, Single-phase, and 15 to 500 kVA, Three-phase, with High-Voltage 601 to 34 500 Volts, Low-Voltage 120 to 600 Volts, ANSI C57.12.50-1981.) This new dry-type transformer standard describes ventilated dry-type transformers with self-cooled kVA ratings 1- 500, and high voltages 2400-34 500 volts.
IEEE - ANSI C57.12.55 - TRANSFORMERS USED IN UNIT INSTALLATIONS, INCLUDING UNIT SUBSTATIONSCONFORMANCE STANDARD - REPLACES NEMA C57.12.55-1987 Organization: IEEE
Date: 1987-01-01
Description: This document refers to the proposed revision of American National Standard for Dry-Type Transformers, ANSI/IEEE C57.12.01-1979 (now in preparation).
ANSI - ANSI C57.12.13 - CONFORMANCE REQUIREMENTS FOR LIQUID-FILLED TRANSFORMERS USED IN UNIT INSTALLATIONS, INCLUDING UNIT SUBSTATIONS Organization: ANSI
Date: 1982-01-01
Description: This standard does not cover the following types of liquid-filled transformers: (1)Overhead-type distribution transformers, including those mounted in surface enclosures (2)Pad-mounted compartmental-type transformers as described and defined in the following standards: American National Standard Requirements for Pad-Mounted Compartmental-Type Self-Cooled Single-Phase Distribution Transformers with High-Voltage Bushings (High-Voltage, 34 500 GrdY/19 920 Volts and Below; Low-Voltage, 240/120; 167 kVA and Smaller), ANSI C57.12.21-1980 American National Standard Requirements for Pad-Mounted Compartmental-Type Self-Cooled Three-Phase Distribution Transformers with High-Voltage Bushing (34 500 GrdY/19 920 Volts and Below; 2500 kVA and Smaller), ANSI C57.12.22-1980 American National Standard Requirements for 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; 167 kVA and Smaller, ANSI C57.12.25-1981 American National Standard Requirements for Pad-Mounted Compartmental-type Self-Cooled Three-Phase Distribution Transformers for Use with Separable Insulated High-Voltage Connectors, High-Voltage, 24 940 GrdY/14 400 Volts and Below; 2500 kVA and Smaller, ANSI C57.12.26-1975 (3) Subsurface or submersible-type transformers as described and defined in the following standards: American National Standard requirements for Underground-Type Single-Phase Distribution Transformers, with Separable Insulated High-Voltage Connectors, High Voltage 24 940 GrdY/14 400 Volts and Below, Low Voltage 240/120, 100 kVA and Smaller, ANSI C57.12.23-1978 American National Standard Requirements for Underground-Type Three-Phase Distribution Transformers, 2500 kVA and Smaller; High Voltage 24 940 GrdY/14 400 Volts and Below; Low Voltage 480 Volts and Below, ANSI C57.12.24-1982 American National Standard Requirements for Secondary Network Tranformers, Subway and Vault Types (Liquid Immersed), ANSI C57.12.40-1982 (4) Rectifier transformers (5) Mobile transformers (6) All transformers for use in ships and other watercraft, railway rolling stock, aircraft, and automotive vehicles other than mobile home and recreational vehicles (7) Transformers used in mines (8) Transformers installed in railways for the generation, transformation, transmission, or distribution of power and used exclusively for operation of rolling stock, or transformers installed in railways and used exclusively for signaling, or communication purposes (9) Instrument transformers (10) Step-voltage regualors and induction voltage regulators (11) Arc furnace transformers (12) Transformers installed with communication equipment under the exclusive control of communication utilities, located outdoors or in building spaces used exclusively for such installations (13) Transformers that are used under the exclusive control of electric utilities for the purpose of communication or metering, or for the generation, control, transformation, transmission, and distribution of electric energy and that are located in buildings used exclusively for such purposes or located outdoors on property owned or leased by the utility, or on public highways, streets, roads, etc, or by established rights on private property
UL 1562 - UL STANDARD FOR SAFETY TRANSFORMERS, DISTRIBUTION, DRY-TYPE - OVER 600 VOLTS - FOURTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING OCTOBER 22, 2015 Organization: UL
Date: 2013-01-25
Description: These requirements do not cover the following transformers: a) Instrument transformers b) Step-voltage and induction voltage regulators c) Current regulators d) Arc furnace transformers e) Rectifier transformers f) Specialty transformers (such as rectifier, ignition, gas tube sign transformers, and the like) g) Mining transformers h) Motor-starting reactors and transformers These requirements do not cover transformers under the exclusive control of electrical utilities utilized for communication, metering, generation, control, transformation, transmission, and distribution of electric energy regardless of whether such transformers are located indoors, in buildings and rooms used exclusively by utilities for such purposes; or outdoors on property owned, leased, established rights on private property or on public rights of way (highways, streets, roads, and the like).
IEEE - ANSI C57.12.12 - GUIDE FOR INSTALLATION OF OIL-IMMERSED EHV TRANSFORMERS 345 KV AND ABOVE - SUPPLEMENT TO ANSI/IEEE C57.12.11-1980 Organization: IEEE
Date: 1980-01-01
Description: This guide is a supplement to ANSI/IEEE C57.12.11- 1980, Guide for Installation of Oil-Immersed Transformers [ l ] ,1 which is basic to transformer installation procedures.
UL 1561 - UL STANDARD FOR SAFETY DRY-TYPE GENERAL PURPOSE AND POWER TRANSFORMERS - FOURTH EDITION; REPRINT WITH REVISIONS THROUGH AND INCLUDING JUNE 16, 2015 Organization: UL
Date: 2011-03-02
Description:   These requirements do not cover ballasts for high intensity discharge (HID) lamps (metal halide, mercury vapor, and sodium types) or fluorescent lamps, exposed core transformers, compound-filled transformers, liquid-filled transformers, voltage regulators, general use or special types of transformers covered in requirements for other electrical equipment, autotransformers forming part of industrial control equipment, motor-starting autotransformers, variable voltage autotransformers, transformers having a nominal primary or secondary rating of more than 600 volts, or overvoltage taps rated greater than 660 volts.
IEEE C57.94 - RECOMMENDED PRACTICE FOR INSTALLATION, APPLICATION, OPERATION, AND MAINTENANCE OF DRY-TYPE DISTRIBUTION AND POWER TRANSFORMERS Organization: IEEE
Date: 2015-12-05
Description: This recommended practice covers general recommendations for the application, installation, operation, and maintenance of all single and polyphase ventilated, non-ventilated, and sealed dry-type distribution and power transformers or autotransformers, including those with solid-cast and/or resin encapsulated windings except as follows: a) Instrument transformers b) Step- and induction-voltage regulators c) Arc-furnace transformers d) Rectifier transformers e) Specialty and general purpose transformers f) Mine transformers g) Testing transformers h) Welding transformers Purpose The recommended practice is intended for general use in the application, installation, operation, and maintenance of dry-type transformers manufactured in accordance with IEEE Std C57.12.01, ANSI C57.12.50 [B1], ANSI C57.12.51 [B2], and ANSI C57.12.52 [B3].
IEEE C57.105 - GUIDE FOR APPLICATION OF TRANSFORMER CONNECTIONS IN THREE-PHASE DISTRIBUTION SYSTEMS Organization: IEEE
Date: 1977-06-02
Description: Foreword(This Foreword is not a part of ANSI/IEEE C57.105-1978, American National Standard Guide for Application of Transformer Connections in Three-Phase Distribution Systems.)
NECA NEIS 430 - STANDARD FOR INSTALLING MEDIUM-VOLTAGE METAL-CLAD SWITCHGEAR Organization: NECA
Date: 2006-01-01
Description: Products and Applications Included Metal-clad switchgear Vacuum circuit breakers Indoor and outdoor locations Testing, energizing, and commissioning Equipment and Applications Excluded Pad-mounted, compartmentalized switchgear Metal-enclosed switchgear Sulfur-Hexafluoride (SF6) circuit breakers Load interrupter switches Underground installations Transformers or unit substations Station-type switchgear Installation of conduits, conductors, cabling, or busways Maintenance Regulatory and Other Requirements a) All information in this publication is intended to conform to the National Electrical Safety Code (ANSI/IEEE C2) and National Electrical Code (ANSI/NFPA 70). Installers should always follow the NESC, NEC, applicable state and local codes, manufacturer's instructions, and contract documents when installing medium-voltage metal-clad switchgear.
IEEE - ANSI C57.12.56 - STANDARD TEST PROCEDURE FOR THERMAL EVALUATION OF INSULATION SYSTEMS FOR VENTILATED DRY-TYPE POWER AND DISTRIBUTION TRANSFORMERS Organization: IEEE
Date: 1986-01-01
Description: These insulation systems are intended for use in transformers listed in ANSI C57.12.50-1981 [1]1 and ANSI C57.12.51-1981 [2], and whose highest voltages exceed nominal 600 V.
IEEE - ANSI C37.47 - HIGH VOLTAGE CURRENT-LIMITING TYPE DISTRIBUTION CLASS FUSES AND FUSE DISCONNECTING SWITCHES Organization: IEEE
Date: 2000-05-03
Description: (Examples - A current-limiting type fuse mounted in a live front pad mounted transformer or in a vault.) Type 2C A fuse mounted in a container with restricted air flow surrounding the fuse, but relatively free air circulation within the enclosure on the outside surfaces of the container.

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