2005 report on developments in the solderability requirements for the NEMA MW 1000 magnet wire standard

During the past year there has been a considerable amount of activity aimed at revising the NEMA MW 1000 solderability standards to make them more consistent across the full size range of all magnet wire products. At the same time efforts continue toward harmonization with the IEC winding wire solderability standards. The final result will establish more meaningful and consistent solderability requirements in NEMA MW 1000. The current NEMA magnet wire solderability standards and our efforts to harmonize with International Electrotechnical Commission (IEC) winding wire solderability standards are briefly reviewed with special emphasis on those solderability changes introduced into NEMA MW 1000. Specifically, changes that will be discussed include modifications to NEMA solderability temperatures and the maximum time allowed for proper soldering at these temperatures. The paper then reviews the results of an industry wide solderability study of various magnet wire products in the 10-52 AWG size range to the proposed new requirements for single, heavy, and triple builds. The solderability changes discussed in this paper will have to be balloted as a revision to NEMA MW 1000