What is the function of a cable tray in electrical installations?

The primary function of a cable tray in electrical installations is to support electrical conductors. Cable trays are structural systems used to securely hold and manage cables in various environments, such as industrial, commercial, and residential settings. They provide a safe and organized way to route and maintain electrical wiring, allowing for efficient distribution while protecting the cables from damage and keeping them neatly contained.

Cable trays offer several benefits, including the ability to accommodate changes in cable configurations without the need for extensive re-wiring, promoting better airflow around the cables for cooling, and simplifying access for maintenance and inspection. Additionally, they can reduce the strain on individual conductors by distributing their weight, which can prolong the life of the cables.

The other options refer to functions or mechanisms that are distinct from what a cable tray provides. Grounding is a separate process concerned with safety and preventing electrical shock. Reducing circuit loads involves managing energy demand and capacity, which is not a function of cable trays. Isolating circuits pertains to safety measures that prevent unintended interactions between different electrical systems, again, not related to the cable tray's supportive role. Thus, the correct choice highlights the essential structural support provided by cable trays in electrical installations.