IEEE 57

Description / Abstract: Part 1 of this Test Procedure is a method for the evaluation of the useful life of round, enameled or film insulated magnet wire. It is not applicable to round or rectangular mange tire insulated with fibrous insulations such as cotton or glass fiber. The Evaluation f fibreous insulated round and rectangular wires will be covered by subsequent Test Procedures. Enameled and film insulated magnet wire having bare, uninsulated wire diameters ranging from 0.0072 to 0.1285 nch inclusive can be evaluated as described herein. However, because of the fragility of the test specifi mens is recommended that wire with diameters larger than 0.0099 ich be used in this method. Furthermore, the purpose of this Test Procedure is to evaluate the thermal stability of the enamel or insulating film rather than its stability as it may be affected by wire diameter. Wire sizes from 0.032 inch through 0.057 inch are generally recommended as being the most convenient to handle and test.