UL 5085-2:2021 free download Low Voltage Transformers – Part 2: General Purpose Transformers
1 Scope
1.1 As noted in Low Voltage Transformers – Part 1:General Requirements, UL 5085-1, or CSA C22.2No.66.1,Low Voltage Transformers -Part 1: General Requirements, the requirements of Part 2 cover:
a) Air-cooled transformers and reactors for general use;
b)Autotransformers;
c) Ferroresonant transformers;
d) Cord-connected transformers; and
e)Transformers incorporating overcurrent or over-temperature protective devices,transientvoltage surge protectors, or capacitors.
1.7These requirements do not cover Class 2 and Class 3 transformers (which are evaluated in Part 3).
1.8 Part 2 is intended to be used in conjunction with Part 1. The numbering of the clauses in Part 2corresponds to the numbered clauses in Part 1.The requirements in Part 1 apply unless modified by Part2.
2Units of Measurement
2.1Values stated without parentheses are the requirement.Values in parentheses are explanatory orapproximate information.
3Referenced Publications
3.1 Any undated reference to a code or standard appearing in the requirements of this Standard shall beinterpreted as referring to the latest edition of that code or standard.
3.2When a reference is made to a code or standard, the product shall comply with the code or standardof the country in which the product is intended to be used.
3.3 In Canada, general requirements applicable to this Standard are given in CSA C22.2 No.0,GeneralRequirements -Canadian Electrical Code, Part w.
3.4Throughout this Standard,the CSA standard references apply to products intended for use inCanada, and the UL standard references apply to products intended for use in the United States.Combined references are separated by a slash( l “) to denote the difference between the applicablerequirements specified for use in Canada and the United States.
3.5 The following publications are referenced in this Standard:
cSA C22.2 No.0,General Requirements – Canadian Electrical Code, Part l
cSA C22.2 No.66.1,Low Voltage Transformers – Part 1: General Requirements
CSA C22.2 No.94.2,Enclosures for Electrical Equipment, Environmental Considerations
IEEE C57.12.91, Standard Test Code forDry-Type Distribution and PowerTransformers
UL 50E, Standard forEnclosures forElectrical Equipment, Environmental Considerations
UL 5085-1, Standard forLowVoltage Transformers – Part 1: General Requirements
5 Mechanical Assembly
5.4 A transformer weighing more than 45 kg (100 lbs) shall be provided with a means for lifting by a forklift, cable, sling, or similar method. The lifting means may be provided on the transformer core or frame if the transformer has a removable top cover. The lifting means shall be subjected to the Lifting or Mounting Means Test in Clause 37.
6 Enclosure 6.5 Openings 6.5.2 Openings shall prevent passage of a straight rod 12.7 mm (0.5 inch) in diameter. When the distance between live parts and the enclosure and between the plane of the ventilation opening and live parts is 102 mm (4 inches) or more, openings shall be constructed so that they will prevent passage of a rod 19 mm (0.75 inch) in diameter. When the distance between the plane of the opening and uninsulated live parts is less than 102 mm (4 inches), the rod shall have a cross-section of 13.4 mm (0.53 inch).
UL 5085-2:2021 free download
