1. A system for fixing a rectangular electrical enclosure (3) in a cabinet shell (1) containing a rectangular bottom mounting plate (30), a rectangular side plate (10) and a supporting element (40) containing a supporting surface (42), and the side plate (10) and the mounting plate (30) are attached to each other and form three planes orthogonal to each other, which define a rectangular trihedron forming the body (2) of said casing (3), a system characterized in that: - the system contains a belt ( 70); - the supporting surface (42) and the mounting plate (30) contain at least one longitudinal hole (72, 74) for the passage of the belt (70), so that depending on the size of the casing installed in the housing (2) , the belt (70), stretched between the holes (72, 74), forms a triangle or quadrangle extending beyond the trihedron close to the bottom plate (30) and the supporting surface (42), the belt (70) is installed flat on each of its hundred ron; - the mounting plate (30) contains a removable locking means (50), said means (50) contains a locking surface (52), the plane of which is parallel to the plane of the side plate (10) and can slide in a direction orthogonal to the said planes, the mounting plate ( 30) additionally contains a guide means (60) of the movable locking means (50) and a removable fastening means (64) of said movable locking means (50) in several relative positions relative to the lower mounting plate (30). The system according to claim. 1, in which the supporting element (40) and / or the mounting plate (30) contain holes for the passage of the belt (70), said holes (
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