Seismic Zones: In earthquake-prone areas, cable tray systems require seismic bracing and support to prevent damage during seismic events. This often involves reinforced fixed supports, shortened support spans, and ensuring cables have adequate room to. Failed supports, separated splice joints, displaced cables, and damaged penetrations can interrupt critical power, control, data, or life-safety systems when they are needed most. This checklist focuses on the engineering decisions that matter most when specifying cable trays for high-seismicity. A number of shake table tests on portions of cable tray and conduit systems confirm these observations from past earthquakes and demonstrate that typical configurations perform well under repeated high- level seismic input test spectra on the order of 1. There are only a. This appendix provides the design criteria for seismic Category I cable trays and their supports. Cable ladder systems and cable tray systems shall be manufactured in accordance with BS EN 61537, channel support. Above the rows of equipment cabinets are three layers of cable trays supported vertically by regularly-spaced rows of proprietary steel channels at the top and bottom cable tray levels that are supported from the equipment cabinets with steel threaded rods, as shown in Figure 3.
