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NEMA - NEMA TR 1 - TRANSFORMERS, STEP VOLTAGE REGULATORS AND REACTORS Organization: NEMA
Date: 2013-01-01
Description: This standard excludes dry type transformers covered by NEMA ST20. This publication provides a reference list of applicable ANSI and IEEE C57 standards.
IEEE 78 - AIEE-FEMA-NEMA STANDARDS PUBLICATION FOR ARC FURNACE TRANSFORMERS Organization: IEEE
Date: 1960-02-01
Description: This standard covers electrical char¬acteristics and mechanical features of 3-phase, 60- cycle, 2-winding, mineral-oil-immersed indoor transformers rated 250 to 35000 kva, inclusive, high voltage 2400 to 34400 volts, inclusive, used for sup¬plying electric power to direct arc ferrous-melting furnaces.
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: Dry-type transformers have been covered in the past by a variety of documents, including American National Standard General Requirements for Distribution, Power, and Regulating Transformers, ANSI C57.12.00- 1973; American National Standard Test Code for Distribution, Power, and Regulating Transformers, ANSI C57.12.90- 1973; American National Standard Dry-Type Transformers for General Applications, ANSI/NEMA ST 20-1 972; and Commercial, Institutional, and Industrial Dry-Type Transformers, NEMA TR 27-1965 (R1976).
IEEE - ANSI C37.121 - AMERICAN NATIONAL STANDARD FOR SWITCHGEAR— UNIT SUBSTATIONS— REQUIREMENTS Organization: IEEE
Date: 1989-06-05
Description: A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition (throat) sections. Since the transformer section determines the kVA and voltage capabilities of a unit substation, the ratings of the various types of unit substations are described in terms of transformer capability.
UL 2756 - UL STANDARD FOR SAFETY UL ADVANTAGE PROGRAM FOR CLASS III PRODUCTS - FIRST EDITION Organization: UL
Date: 2011-08-24
Description: These requirements do not apply to products with Laser Modules, notebook type computers, Class III devices other than described above in 1.1, products incorporating a high voltage inverter operating above SELV limits, Class I or Class II products with a NEMA enclosure rating or IP Rating noted either in the manual or marketing materials or marked on the unit, an interface to a cable distribution system or telecommunications network (TN) or motors.

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