标准摘要
[中文适用范围]： 规定了符合 IEC 34-1 的旋转电机的最大允许 A 计权声功率级，其冷却方法符合 IEC 34-6，防护等级符合 IEC 34-5。 [外文原描述]： Specifies maximum permissible A-weighted sound power levels for rotating electrical machines complying with IEC 34-1, with methods of cooling according to IEC 34-6 and degrees of protection according to IEC 34-5.
英文名称Rotating electrical machines - Part 9: Noise limits