Abstract: A modular system for the securement of a conduit to longitudinal constructional member defining in transverse cross-section continuous integral upper and side surfaces in which the side surfaces, at their lower ends, turn inwardly and upwardly to form respective internal longitudinal tracks within the member that are co-directional with a longitudinal axis of the member, which includes elements for horizontal suspension to the interior of the structural building. The system includes a back bracket having, in transverse cross-section, a partial polygonal back surface having several faces, at least one face comprising an externally protruding radial portion including elements for selectable lockable engagement between the radial portion and a longitudinal segment of the constructional member, the bracket having front surfaces defining resilient nesting elements having a partially opened-faced geometry, the nesting elements proportioned to the exterior geometry of the conduit to be secured.