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PoE负载是否需要隔离?

Other Parts Discussed in Thread: TPS2378

我想咨询一下,用PoE供电,负载是否一定要隔离?我想要用PoE给音频功放供电!TPS2378 Datasheet里面说“The TPS2378 device will typically be followed by a power supply such as an isolated flyback or active clamp forward converter or a non-isolated buck converter”,可以接Buck变换器,是不是可以理解成不用隔离变压器?但是我在另外的文档里看到,说“根据设备标准IEC 60950中的规定,要求PSE和PD设备电隔离性能应满足在50~60Hz范围内,60s内应可承受均方根值1 500V的电压。”,不知道该怎么理解呢?谢谢了!