Seismic Braced Slotted Cable Tray Earthquake Zone Industrial Cable Support Structure | Braced Open Slot Steel Tray for Earthquake Zone Cable Safety Product Overview This seismic braced slotted cable tray is engineered for plants in earthquake zones where cable routes must stay in place during ground movement. The heavy metal sheet body and reinforced folded rails give the slotted cable tray the structural toughness and locking strength needed under lateral and vertical shock.