2012年1月29日 · The are labelled as Form 1, Form 2, Form 3 and Form 4. 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:

is usually constructed from the level of form below it. For example, form 3b is constructed from form 2b by adding additional components, in this case horizontal separation screens. 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

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

2020年5月26日 · Form 2a – External cabling terminals are not separated from the busbar. 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 ...

2024年10月30日 · Form 2a: Terminals for external conductors separated from busbars: 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: Terminals for external conductors not separated from busbars ...

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 · 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。 ... 有关低压柜分隔形式Form形式，国标GB 7251.12 (2013) ...

2023年10月9日 · Forms 2a and 2b. Form 2a is the simplest for protecting against accidental contact with the busbars, which are considered to be the most dangerous components. Form 2b includes additional separation to make it safe to work …

2017年7月29日 · FORM 2 (Form 2a) Basic form as above. However, with this method terminals are not separated from the busbars, or each other. ... FORM 2 Type 1 (Form 2b Type 1) FORM 2 Type 2 (Form 2b Type 2) Main criteria as FORM 2. Busbar separation is achieved by metallic or non-metallic rigid barriers or partitions. Terminals are therefore separated from the ...

2022年10月31日 · The are labelled as Form 1, Form 2, Form 3 and Form 4. 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: