INIPT01
SIMBOL表格4（（母线与功能单元的分离+功能单元彼此的分离+端子彼此的分离）表格4a端子与相关功能单元表格4b端子与相关功能单元表格2（母线与功能单元的分离）表格2a位于同一隔间未与母线分离的端子表2b与母线分离的端子表3（母线与功能单元分离+功能单元彼此分离）表3a与母线分离的端子表3b与母线分离的端子表1SDC0008039F0201存在不同类别的配电盘，取决于一系列因素。根据结构类型，标准IEC 61439-1首先区分了开放式组件和封闭式组件。配电盘由四面的保护面板组成，可提供一定程度的保护，防止直接接触至少IPXXB。正常环境下使用的配电盘必须封闭。开放式配电盘，带或不带前盖，可接触带电部件。这些配电盘只能用于发电厂。就外部设计而言，配电盘分为以下类别：-用于大型控制和配电设备的柜式组件；多隔间式组件可通过并排放置隔间获得。-台式组件，用于控制机械、钢铁和化学工业中的机械或复杂系统。-以壁装为特征的箱式组件，可安装在墙上或嵌入式配件上；这些配电盘通常用于工业环境和第三产业的部门或区域级配电。

INIPT01
Simbols Form 4 ((separation of the busbars from the functional units + separation of the functional units from each other + separation of the terminals from each other) Form 4a Terminals in the same compartment as the associated functional unit Form 4b Terminals in the same compartment as the associated functional unit Form 2 (segregation of the busbars from the functional units) Form 2a Terminals not separated from the busbars Form 2b Terminals separated from the busbars Form 3 (separation of the busbars from the functional units + separation of the functional units from each other) Form 3a Terminals not separated from the busbars Form 3b Terminals separated from the busbars 1SDC008039F0201 Classification Different classifications of electrical switchboard exist, depending on a range of factors. Based on construction type, Standard IEC 61439-1 firstly distinguishes between open and enclosed assemblies. A switchboard is enclosed when it comprises protective panels on all sides, providing a degree of protection against direct contact of at least IPXXB. Switchboards used in normal environments must be enclosed. Open switchboards, with or without front covering, which have the live parts accessible. These switchboards may only be used in electrical plants. With regard to external design, switchboards are divided into the following categories: - Cubicle-type assembly Used for large scale control and distribution equipment; multi-cubicle-type assembly can be obtained by placing cubicles side by side. - Desk-type assembly Used for the control of machinery or complex systems in the mechanical, iron and steel, and chemical industries. - Box-type assembly Characterized by wall mounting, either mounted on a wall or flush-fitting; these switchboards are generally used for distribution at department or zone level in industrial environments and in the tertiary sector.