An installation box for electrical distribution applications, comprising: - a housing suitable to accommodate one or more electrical devices, said housing comprising one or more pieces (3, 4) connected together and being made of electrically insulating material; - a door made of electrically insulating material; - means for connecting the door to said housing; characterized in that said connecting means comprise: - a plurality of protuberances which are integrally made with and extend outwardly from one of said one or more pieces (3, 4) of the housing towards said door, wherein said plurality of protuberances are configured so as said door is connected therewith rotating about a rotation axis relative to the housing itself and are spaced apart from each other and aligned along said rotation axis, and in that said connecting means further comprise a plurality of connection portions which are integrally made with and extend inwardly from the front face of the door towards said housing, each of said plurality of connection portions being configured so as each engages and forms together with an associated protuberance a hinge-like mechanism, wherein each of said plurality of protuberances comprises a central elbow-shaped part which protrudes transversally from a front part of one of said one or more pieces (3, 4) of the housing, and at least a first pin protruding transversally from said central elbow-shaped portion along said rotation axis and wherein each of said plurality of connection portions comprise at least a first substantially planar fin which protrudes transversally from the front face of the door inwardly towards said housing, a through hole suitable to receive a corresponding first pin being provided on said first planar fin. - a housing suitable to accommodate one or more electrical devices, said housing comprising one or more pieces (3, 4) connected together and being made of electrically insulating material; - a door made of electrically insulating material; - means for connecting the door to said housing; - a plurality of protuberances which are integrally made with and extend outwardly from one of said one or more pieces (3, 4) of the housing towards said door, wherein said plurality of protuberances are configured so as said door is connected therewith rotating about a rotation axis relative to the housing itself and are spaced apart from each other and aligned along said rotation axis, and in that said connecting means further comprise a plurality of connection portions which are integrally made with and extend inwardly from the front face of the door towards said housing, each of said plurality of connection portions being configured so as each engages and forms together with an associated protuberance a hinge-like mechanism, wherein each of said plurality of protuberances comprises a central elbow-shaped part which protrudes transversally from a front part of one of said one or more pieces (3, 4) of the housing, and at least a first pin protruding transversally from said central elbow-shaped portion along said rotation axis and wherein each of said plurality of connection portions comprise at least a first substantially planar fin which protrudes transversally from the front face of the door inwardly towards said housing, a through hole suitable to receive a corresponding first pin being provided on said first planar fin.