An evaluation of the accuracy and reliability of enameled wire tests

The recent large increase in the number of new wire enamels, with the attendant emphasis on improvement in some particular wire property, necessitates refocusing our attention on the test methods used to obtain these values. Many of these are time honored tests and it is sometimes taken for granted that they will give meaningful values. This results in a tendency to put a number, or a small range, on a given wire property without any direct reference to the degree of accuracy or reproducibility of the test involved. Further the weighting placed, on the reliability of the test method will vary depending on whether the reader's viewpoint is in terms of: a. Enamel acceptance b. Wire mill production c. Equipment manufacture.