2012年1月29日 · Forms 2, 3 and 4 are further broken down into Form 2a, 2b, 3a, 3b, 4a and 4b. Each Form relates to the internal separation of the busbars, functional units and terminals, each being defined as:

Standard EN 60439-1 defines the internal separation of assemblies into 4 types of form, each form being divided into two groups “a” and “b” (2a, 2b, 3a, 3b, 4a and 4b). This internal separation is achieved in XL3 4000 enclosures by using metallic or insulating barriers or screens.

2020年5月26日 · Form 2b – External cabling terminals are separated from the busbar. There are several advantages to segregating functional units and busbars, not least of which is safety. This model allows circuit breakers to be reset when the switchboard is live because the operator is not exposed to a live busbar.

2024年10月30日 · Form 2b Separation of busbars from the functional units and separation of all functional units from one another. Separation of the terminals for external conductors from the functional units, but not from each other

型式. 描述. 图片. 型式1: 无内部隔离: 型式2: 母线与功能单元隔离. 型式3: 母线与功能单元隔离. 功能单元之间互相隔离. 出线端子与功能单元隔离

2024年10月30日 · Form 2 partitioning of switchboard. There are two variants of form 2: Form 2b provides more safety than form 2a, since the connection terminals are separated from the busbars. Form 2a. Terminals for external conductors are not separated from the busbars.

2018年12月5日 · 分隔型式类型2a和2b（form2a、form2b）： 图中有两种分隔型式类型，即分隔型式类型2a和分隔型式类型2b。 分隔型式类型2a采取的措施是用隔板将所有功能单元与母线系统隔离，但功能单元之间不隔离，同时电缆接点与母线系统之间也未隔离。

2017年7月29日 · FORM 2 separation (Form 2a) FORM 2 Type 1 (Form 2b Type 1) Main criteria as FORM 2. Busbar separation is achieved by insulated coverings, e.g. PVC sleeving, wrapping or coating. Terminals are therefore separated from the …

2022年10月31日 · Forms 2, 3 and 4 are further broken down into Form 2a, 2b, 3a, 3b, 4a and 4b. Each Form relates to the internal separation of the busbars, functional units and terminals, each being defined as: Busbar - low impedance conductor …

2023年10月9日 · Form 2b includes additional separation to make it safe to work on outgoing lines. In form 3a, each device is isolated in a compartment that protects it from the effects of incidents that may occur on another device. Form 3b combines the advantages of Form 3a and Form 2b, separating the output terminals and the busbars.