A system of cable trays is the set of parts (straight sections; curves and support system) that form a rigid structural system and that fulfills the following functions within an electrical or professional data installation: cable support; ensuring a certain load capacity. facility for future extensions of the electricity or data network. cable management in order to identify each conductor at any point of the installation. grounding system cable trays are manufactured under international standards; they have national certification and are listed with international certification (for aluminum ladder type cable trays.