UL 2353-2021 pdf free download.Single- and Multi-Layer Insulated Winding Wire.
7.3 Performance tests conducted on wire whose insulation was wrapped or extruded over a bare conductor are representative of wire of the same construction except with the insulation wrapped or extruded insulation over enameled magnet wire.
7.4 Performance tests conducted on wire whose insulation was wrapped or extruded over an enameled magnet wire are only representative of similarly constructed wire produced using chemically and thermally similar enameled magnet wire.
8 Electric Strength Test – Straight Sample
8.1 For all constructions, five straight lengths of any wire 305-mm (12-in) long are to be subjected to an electric strength test in accordance with the requirements for electric strength as specified in the Standard for Information Technology Equipment – Safety – Part 1: General Requirements, UL 60950-1, the Standard for Medical Electrical Equipment, Part 1: General Requirements for Safety, UL 60601-1, or the Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1 Safety Requirements – Electrical, Thermal and Energy, UL 61800-5-1. The test voltage is to be in accordance with the applicable test voltages for electric strength tests in the Test Voltages for Electric Strength Tests Based on Peak Working Voltages (Part 1 and Part 2) Tables of UL 60950-1, the Test Voltages Table of UL 60601-1, or the Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1 Safety Requirements – Electrical, Thermal and Energy, UL 61800-5-1, Table 5.2.3.2.2DV.1 for basic and supplementary insulation and Table 21, Column 3 for reinforced insulation unless otherwise indicated below. The voltage is to be applied between the conductor and foil wrapped in direct contact with the center 150 mm (6 in) of the sample.
8.2 Additionally, for any wire evaluated for compliance with 5.1.1, five samples of each layer are to be subjected to an electric strength test in accordance with the requirements for electric strength, as 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. This additional test is also required for insulation used in products evaluated in accordance with the Standard for Adjustable Speed Electrical Power Drive Systems – Part 5-1 Safety Requirements – Electrical, Thermal and Energy, UL 61800-5-1. The test voltage is to be as specified in Table 5.2.3.2.2DV.1 for basic and supplementary insulation and as specified in Table 21, Column 3 for reinforced insulation. The test voltage is to be in accordance with test voltages for electric strength tests, in UL 60950-1 or from UL 60601-1. The voltage is to be applied between the conductor and foil wrapped in direct contact with the center 150 mm (6 in) of the sample. For separable constructions, the voltage is to be applied through each layer of tape for one- and two-layer constructions, and through all combinations of any two layers for three- layer constructions, by the means of flat-surfaced electrodes. The test voltage shall be applied at a rate of 500 V/s. to the specified test voltage and held for 60 s.
8.3 There shall be no insulation breakdown during this test. Insulation breakdown is determined to have occurred when the current which flows as a result of the application of the test voltage rapidly increases in an uncontrolled manner (i.e. the insulation does not restrict the flow of the current). Corona discharge or a single momentary flashover is not regarded as insulation breakdown.UL 2353 pdf download.