UL 2353:2021 PDF Download

UL 2353:2021 specifies the requirements for insulated winding wires used in transformers and other electrical equipment. The standard covers both single and multi-layer insulated winding wires without interleaved insulation. These wires are intended for use in accordance with various other safety standards, such as UL 60950-1, UL 60601-1, IEC 61558-1, or UL 61800-5-1. It is important to note that this standard does not prohibit the use of winding wire in equipment covered by other standards, as long as the requirements are determined to be compatible.

Additionally, UL 2353 includes requirements for enamelled Fully-Insulated Wire (FIW) that can be used in end-products standards. This type of wire needs to adhere to the designated NEMA Type MW 85 specification outlined in the Standard for Magnet Wire, NEMA MW 1000.

The standard covers winding wires with diameters ranging from 0.05 mm to 5.0 mm and MW 85 solvent-based enamel coated winding wires with diameters ranging from 0.040 mm to 1.60 mm. These wires also need to comply with the infrared analysis requirements specified in the Standard for Polymeric Materials - Short Term Property Evaluations, UL 746A.

However, it should be noted that this standard does not cover solvent-based enamel coated magnet wire, unless specified in the second clause. In this case, it refers to the Standard for Systems of Insulating Materials - General, UL 1446. If the desired usage of the single- and multi-layer insulated winding wire exceeds Class 105 (A), additional testing of the insulation system is required in accordance with UL 1446.