Ri4Power Internal separation of switchgear The areas to be separated are the busbar compartments, enclosures function units and connection areas. The degree of internal separation should be agreed between the manufacturer of Internal separation of a switchgear enclosure increases the the switchgear enclosure and the user. level of safety for individuals and the system itself. Meaning a Enclosure a b Internal compartmentalisation c Main or multi-terminal busbar b d Function units e External connections c d e Table 20: Forms of internal separation Standard IEC/EN 61 439-2 defines the following forms of internal separation (cf. section 8.101, DIN EN 61 439-2) Form 1 No internal separation. There is no separation between the individual areas. Form 2a Separation between the busbars and function units, but no separation between the connections and busbars. Form 2b Separation between the busbars and function units, and separation between the connections and busbars. Form 3a Separation between the busbars and function units and sepa- ration between the individual function units and separation between the connections for conductors fed in from the out- side and the function units, but not between the connections themselves. However, with Form 3a there is no separation between the connections and busbars. Form 3b Separation between the busbars and function units and sepa- ration between the individual function units and separation between the connections for conductors fed in from the out- side and the function units, but not between the connections themselves. With form 3b there is separation between the connections and busbars. Rittal Technical System Catalogue/Power distribution 72
Technical System Catalogue Ri4Power
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