Patent ID: 8683753

Claim:
Set for building an enclosure for secondary distribution modular switchgears, said set comprising wall elements to form enclosure walls, roof elements to form a roof, and a set of base-frame elements to form a base-frame composed of a metal truss, said enclosure walls being fixed on said base-frame and being covered by said roof to form said enclosure, said set for building an enclosure for secondary distribution modular switchgears being characterized in that said set of base frame elements comprises at least three separate metal truss base-frame modules, comprising permanent coupling elements and being connectable with one another by means of a pair of said permanent coupling elements, each said permanent coupling element formed by an enclosed socket associated with one of said modules and a prong associated with another of said modules and extending from said module so as to face said module with said enclosed socket, and corresponding fastening and earthing plates extending from said facing modules connected to each other with said prong fully received in said corresponding enclosed socket, wherein said fastening and earthing plates extend from a corresponding end of said coupling element that forms said enclosed socket and from a corresponding end of said coupling element from which said prong extends, said fastening and earthing plates positioned substantially adjacent one another and attached to one another when said prong is fully received in said corresponding enclosed socket, two of said modules forming the extreme base-frame modules, the left one and the right one and the at least third module forming the at least one middle module.