Dry-Type General Purpose and Power Transformers (air-cooled)

CSA C22.2 No. 47 Scope:
1.1
This Standard applies to single-phase and polyphase transformers of the dry type for supplying energy to power, heating, and lighting circuits and designed to be installed and used in accordance with the Canadian Electrical Code, Part I.
 

1.2
This Standard applies to multiwinding and autotransformers rated 72.5 kV class and less.
 

1.3
This Standard applies to transformers for use in nonhazardous indoor and outdoor locations.
 

1.4
This Standard does not apply to specialty transformers, transformers for luminous-tube signs, oil or gas burner ignition, cold-cathode interior lighting, or electronic or liquid-filled designs.
 

1.5
This Standard does not include energy efficiency or product performance requirements. For such requirements, see CAN/CSA-C802.2 or CSA C9 where applicable.
 

1.6
General requirements applicable to this Standard are provided in CAN/CSA-C22.2 No. 0.
 

1.7
In this Standard, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the standard.
 

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
 

Notes to tables and figures are considered part of the table or figure and may be written as requirements.
 

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

CSA C22.2 No. 47 Scope:
1.1
This Standard applies to single-phase and polyphase transformers of the dry type for supplying energy to power, heating, and lighting circuits and designed to be installed and used in accordance with the Canadian Electrical Code, Part I.
1.2
This Standard applies to multiwinding and autotransformers rated 72.5 kV class and less.
1.3
This Standard applies to transformers for use in nonhazardous indoor and outdoor locations.
1.4
This Standard does not apply to specialty transformers, transformers for luminous-tube signs, oil or gas burner ignition, cold-cathode interior lighting, or electronic or liquid-filled designs.
1.5
This Standard does not include energy efficiency or product performance requirements. For such requirements, see CAN/CSA-C802.2 or CSA C9 where applicable.
1.6
General requirements applicable to this Standard are provided in CAN/CSA-C22.2 No. 0.
1.7
In this Standard, shall is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; should is used to express a recommendation or that which is advised but not required; and may is used to express an option or that which is permissible within the limits of the standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

UL 1561 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.