SIS SS-EN 60 439-3-1991 工业用低压成套开关设备和控制设备．第3部分：打算安装在让非熟练人员有机会使用的地方的低压成套开关设备和控制设备组件的特殊要求

标准号：SIS SS-EN 60 439-3-1991
中文标准名称：工业用低压成套开关设备和控制设备．第3部分：打算安装在让非熟练人员有机会使用的地方的低压成套开关设备和控制设备组件的特殊要求
英文标准名称：Low-vo/tage switchgear and controlgear assemblies — Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places here unskilled persons have access for their use
发布日期：1991/12/4 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：Replace the second note by:This standard gives supplementary requirements for such enclosed distribution boards (DBU), which are stationary, type tested assemblies (TTA) for indoor use, containing protective devices and intended for use either in domestic (household) applications or in other places where unskilled persons have access for their use. Control and/or signalling devices may also be included. They are for use on a.c, with a nominal voltage to earth not exceeding 300 V. The outgoing circuits contain short-circuit protective devices, each having a rated current not exceeding 125 A with a total incoming load current not exceeding 250 A.NOTE - The nominal voltage to earth in an IT system is taken as the nominal voltage of the system.Unskilled persons normally have access to these assemblies, e.g. for switching operations and for repiacing fuse-links.Requirements for assemblies for outdoor use are under consideration.