Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz -- Part 2-1: Immunity requirements for mains communications equipment and systems operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in residential, commercial and light industria
频率范围为3 kHz至148.5 kHz的低压电气装置上的信号第2-1部分:在频率范围为95 kHz至148.5 kHz的住宅、商业和轻工业用主通信设备和系统的抗扰度要求