TU831V1
这些标准适用于额定电压不超过1000 V（交流）或1500 V（直流）的低压组件。IEC 61439-1给出了低压组件的一般规则，而即将发布的其他部分涉及组件的特定类型，应与一般规则一起阅读。设想的部件如下：-IEC 61439-2：“电力开关设备和控制设备”；-IEC 61439-3：“配电盘”（取代IEC 60439-3）；-IEC 61439-4：“建筑工地用组件”（取代IEC 60439-4）；-IEC 61439-5：“配电组件”（取代IEC 60439-5）；-IEC 61439-6：“母线槽系统”（取代IEC 60439-2）。IEC发布的另外两份关于开关设备和控制设备组件的文件仍然可用：-标准IEC 60890，代表通过计算或应用设计规则进行温升评估的方法；-标准IEC/TR 1117表示通过计算或应用设计规则评估短路耐受强度的方法。标准IEC 61439-1如前所述，由IEC通过代码61439定义的新标准包包括基本标准61439-1和指装配类型的特定标准。一个标准涉及所有组件的共同特征、特性和性能，然后在相关特定标准中考虑。这是新IEC 61439的当前结构：1）IEC 61439-1：“低压开关设备和控制设备组件-1部分：一般规则”；2） IEC 61439-2：“电力开关设备和控制设备”；3） IEC 61439-3：“配电盘”；4） IEC 61439-4：“建筑工地用组件”；5） IEC 61439-5：“配电组件”；6） IEC 61439-6：“母线槽系统”。关于一致性声明，应根据相关产品标准声明每个特定组件类型（即，电力开关设备和控制设备应声明符合IEC 61439-2；配电盘应符合IEC 61439-3）。.

TU831V1
These Standards apply to the low voltage assemblies for which the rated voltage does not exceed 1000 V in case of a.c. or 1500 V in case of d.c.). IEC 61439-1 gives the general rules for LV assemblies, whilst the other parts to be issued concern the specific typologies of assemblies and are to be read together with the general rules. The envisaged parts are the following ones: - IEC 61439-2: “Power switchgear and controlgear”; - IEC 61439-3: “Distribution boards” (to supersede IEC 60439-3); - IEC 61439-4: “Assemblies for construction sites” (to supersede IEC 60439-4); - IEC 61439-5: “Assemblies for power distribution” (to supersede IEC 60439-5); - IEC 61439-6: “Busbar trunking systems” (to supersede IEC 60439-2). Two other documents published by IEC about swithchgear and controlgear assemblies are still available: - the Std. IEC 60890 which represents a method of temperature rise assessment by calculation or by the application of design rules; - the Std. IEC/TR 1117 which represents a method for assessing the shortcircuit withstand strength by calculation or by the application of design rules. The Std. IEC 61439-1 As already said, the new package of Standards, defined by IEC through code 61439, consists of the basic Standard 61439-1 and by the specific Standards referred to the assembly typology. The first Standard deals with the characteristics, the properties and the performances which are in common to all the assemblies then considered in the relevant specific Standard. This is the present structure of the new IEC 61439: 1) IEC 61439-1: “Low-voltage switchgear and controlgear assemblies - Part 1: “General rules”; 2) IEC 61439-2: “Power switchgear and controlgear”; 3) IEC 61439-3: “Distribution boards”; 4) IEC 61439-4: “Assemblies for construction sites”; 5) IEC 61439-5: “Assemblies for power distribution”; 6) IEC 61439-6: “Busbar trunking systems”. As regards the declaration of conformity, each specific assembly typology shall be declared in compliance with the relevant product standard (that is the power switchgear and controlgear shall be declared complying with IEC 61439-2; the distribution boards in compliance with IEC 61439-3).