UL 2353-2016 pdf download – Single- and Multi-Layer Insulated Winding Wire.
2.2 Undated references 2.2.1 Any undated reference to a code or standard appearing in the requirements of this Standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary 3.1 In the text of this standard, the letters ″ITE″ refer to information technology equipment. For the purpose of this Standard, the following definitions apply. See the following standards for additional definitions: a) The Standard for Information Technology Equipment – Safety – Part 1 : General Requirements, UL 60950-1 ; b) The Standard for Medical Electrical Equipment, Part 1 : General Requirements for Safety, UL 60601 -1 ; or the c) The Safety of Power Transformers, Power Supplies, Reactors and Similar Products – Part 1 : General Requirements and Tests, IEC 61 558-1 . 3.2 BASIC INSULATION – Insulation that provides basic protection against the risk of electric shock. 3.3 CLEARANCE – The shortest distance between two conductive parts measured through air. 3.4 CREEPAGE DISTANCE – The shortest path between two conductive parts measured along the surface of the insulation. 3.5 INSULATING LAYER – A single, concentric thickness of material that is detectable with an optical or mechanical measuring device. Enamel, bond coats, etc. are not considered insulating layers. See 1 .2. 3.6 REINFORCED INSULATION – A single insulation that provides protection against risk of electric shock equivalent to double insulation under the conditions specified in the Standard for Information Technology Equipment – Safety – Part 1 : General Requirements, UL 60950-1 , or the Standard for Medical Electrical Equipment, Part 1 : General Requirements for Safety, UL 60601 -1 . Reinforced insulation is not required to be provided in one homogeneous piece. It may consist of several layers that cannot be tested as supplementary or basic insulation.
4 Conductor Dimensions 4.1 Single and multi – layer insulated wire 4.1 .1 When determining the conductor dimensions, tin or any other metal on the conductor is allowed to remain on the conductor and included in the measurement. Solvent based enamels are to be removed prior to any measurements. Measurements of the diameter of a solid conductor are to be made over such coating by means of a machinist’s micrometer caliper having flat surfaces both on the anvil and on the end of the spindle and calibrated to read directly to at least 0.01 mm or 0.001 in, with each division of a width that facilitates estimation of each measurement to 0.001 mm or 0.0001 in. The maximum and minimum diameters at a given point on the conductor are each to be recorded to the nearest 0.001 mm or 0.0001 in, added together, and divided by 2 without any rounding of the sum or resulting average. 4.1 .2 The conductor-size range shall be as specified in Conductor dimensions, Table 4.1 for wires constructed to the customary US AWG trade sizes, or Table 4.2 for wires constructed to the customary metric trade sizes and any other non-customary size. The unrounded average of the two micrometer readings is therefore to be compared directly with the minimum in the table for the purpose of determining whether the solid conductor does or does not comply with the diameter requirement.