IEC 60317-57:2010规定了具有基于聚酰胺-酰亚胺树脂的底涂层的220级漆包圆铜绕组线的要求，只要其保留原始树脂的化学特性并满足所有规定的电线要求，就可以对其进行改性。220级是要求最低温度指数为220且热冲击温度至少为240℃的热等级。 本出版物应与IEC 60317-0-1:20 08一起阅读。

IEC 60317-57:2010 specifies the requirements of an enamelled round copper winding wire of class 220 with a sole coating based on polyamide-imide resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. Class 220 is a thermal class that requires a minimum temperature index of 220 and a heat shock temperature of at least 240 °C.

This publication is to be read in conjunction with IEC 60317-0-1:2008.