Tray may refers to cable tray or tubing tray.
Cable Tray is used to support large number of cable or tubing between two points. Tray material shall be selected according to environmental and installation conditions.
Several types of material are available such as 316 SS, GRP, galvanized steel and aluminium.
The design of tray is recommended to be perforated to prevent liquid or droplet trapped. Tray shall be protected with tray cover for installation where possibility of fallen objects such as liquid spill, debris, etc, on the tray may exist.
Besides supported by tray, cable may also be support by ladder for larger cable or by channel for fewer number of cable.
Below picture shows perforated tray drawing.