Panduit® Wyr-Grid® Overhead Cable Tray System Wyr-Grid® Cable Tray Load Rating Report
Wyr-Grid® Cable Tray Load Rating Report Limits on deflection from cable loading are set forth in EN 61537:2007. The safe working load (SWL) is the evenly distributed load at which the transverse deflection of the cable tray is less than 1/100th of the span between supports in the longitudinal direction, as shown in Figure 1. Furthermore, the transverse deflection at the SWL must be less than 1/20th of the cable tray width at the SWL, as shown in Figure 2.
Wyr-Grid® Cable Tray Load Rating Report Limits on the deflection of support brackets, such as trapeze and cantilever brackets, are also set forth in EN 61537:2007. The maximum deflection of support brackets is 1/20th of the support width. The maximum deflection of the trapeze bracket occurs in the center, as shown in Figure 3, while the maximum deflection of the cantilever bracket occurs at the end, as shown in Figure 4.
Wyr-Grid® Cable Tray Load Rating Report Table 1 outlines the Safe Working Load for each size of Wyr-Grid® Cable Tray based on internal testing.
Wyr-Grid® Cable Tray Load Rating Report Typically, wire basket has a sidewall that must be removed to create intersections which significantly reduces the strength of the product. The downward sidewall (see Figure 2) of the Wyr-Grid® Cable Tray allows intersections to be constructed without sidewall removal, maintaining the integrity of the tray. Figures 6 and 7 show support recommendations for making intersections.
Wyr-Grid® Cable Tray Load Rating Report Figure 8 shows support recommendations for making vertical level changes.
