适用于电信和信号网络的浪涌保护装置，以防雷电或其他瞬态过电压的间接和直接影响。 这些SPD的目的是保护连接到标称系统电压高达1000 V（r.m.s.）a.c.和1500 V d.c.的电信和信号网络的现代电子设备。 2001年3月勘误表的内容已包含在本副本中。

Is applicable to devices for surge protection of telecommunications and signalling networks against indirect and direct effects of lightning or other transient overvoltages. The purpose of these SPDs is to protect modern electronic equipment connected to telecommunications and signalling networks with nominal system voltags up to 1 000 V (r.m.s.) a.c. and 1 500 V d.c. The contents of the corrigendum of March 2001 have been included in this copy.