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UL 1561

Standard for Dry-Type General Purpose and Power Transformers

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Organization: UL
Publication Date: 2 March 2011
Status: active
scope:

ul-1561.4

Dry-Type General Purpose and Power Transformers

UL 1561

1 Scope

1.1 These requirements cover:

a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated types to be used in accordance with the National Electrical Code, ANSI/NFPA 70. Constructions include step up, step down, insulating, and autotransformer type transformers as well as air-cooled and dry-type reactors or

b)    General purpose and power transformers of the exposed core, air-cooled, dry, and compound-filled types rated more than 10 kVA to be used in accordance with the National Electrical Code, ANSI/NFPA 70. Constructions include step up, step down, insulating, and autotransformer type transformers as well as air-cooled, dry, and compound-filled type reactors.

1.2 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.

1.3 These requirements do not cover transformers provided with waveshaping or rectifying circuitry. Waveshaping or rectifying circuits may include components such as diodes and transistors. Components such as capacitors, transient voltage surge suppressors, and surge arresters are not considered to be waveshaping or rectifying devices.

Document History

May 13, 2019
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...
June 16, 2015
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...
June 16, 2015
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...
December 22, 2014
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...
December 22, 2014
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...
September 28, 2012
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...
UL 1561
March 2, 2011
Standard for Dry-Type General Purpose and Power Transformers
Dry-Type General Purpose and Power Transformers UL 1561 1 Scope 1.1 These requirements cover: a)    General purpose and power transformers of the air-cooled, dry, ventilated, and nonventilated...

References

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