Steel cable trays are applied in industrial engineering
      Cable trays have been widely used in industrial and civil engineering. Their varieties include steel cable trays, aluminum alloy cable trays, and fiberglass reinforced plastic cable trays. The most commonly used in engineering are steel cable trays; however, current electrical and automation surface construction and inspection standards, as well as quality assessment specifications, have limited and sometimes inconsistent or contradictory provisions regarding steel cable trays.
Steel cable trays (hereinafter referred to as trays)
    Refers to the complete system composed of steel ladder-type or tray straight sections, bends, width-variable straight sections, and supporting hangers, used to support cables, featuring a tightly connected rigid structural system (trays are divided into perforated, non-perforated, and assembled types. Small non-perforated trays are often called wire ducts, used for laying wires).
Fill rate
    Also known as cross-sectional utilization rate; it is the percentage of the total cross-sectional area occupied by cables and wires, including their insulation, within the tray's cross-sectional area.
Steel cable tray supports and hangers
    Refers to the collective term for components that bear the tray, including upright columns, brackets, straight supports, L-shaped supports, and door-type supports;
Additional concentrated load
    Loads that can be applied to the tray during installation and maintenance, in addition to the self-weight of the tray and cables (wires).