Cable tray is nothing but the way or media through which we lay the field cables in plant. There are two basic types

1) Ladder type(made in Rungs type construction)

2) Perforated Type(Solid sheath consist of Holes for ventilation). Basically discussing about tray support than we could say it depends on the site conditions. Only care has to be taken considering adequate space for laying cable, considering their bends. Etc.