Seismic brace for electric cable tray

DETAILED DESCRIPTION It is the primary object of the present invention to provide a seismic restraint or brace for connected sections of cable tray which will support the tray sections to avoid that shifting that might destroy or separate elements of the cable tray which could occur during an earth tremor or earthquake.
A further object of the invention is to provide such a seismic brace which inhibits the cable tray from shifting laterally or longitudinally or up and down with respect to the structure to which it is attached.
Another object of the invention is to provide such a seismic restraint or brace which is easy to assemble on site.
Another object of the invention is to minimize the expense of the cable tray installation and particularly its seismic restraint or brace.
The seismic brace or restraint according to the invention comprises a number of components.
There is a supporting yoke through which the ends of the spines and/or the splice connector between adjacent spine ends of the cable tray pass.
A cap is attached above the yoke to provide connections to struts.
A hanger rod is suspended from the structure above and is connected with the cap to support the yoke.
Struts are connected to the cap, some by means of side brackets supported on the cap.
The struts are connected to the underside of a structure beneath which the cable tray is supported, e.
g.
a ceiling.
At least one strut and preferably a plurality of struts extend in directions that inhibit the seismic brace from moving laterally, e.
g.
one strut is inclined off in each lateral direction away from the brace.
At least one strut and preferably a plurality of struts extend in directions that inhibit the seismic brace from moving longitudinally, e.
g.
one strut is inclined off in each longitudinal direction away from the brace.
The hanger rod above the seismic brace inhibits the brace from shifting vertically.
Therefore, the seismic brace is restrained from moving along all three axes.
Other objects and features of the present invention will become apparent from the following description of a preferred embodiment of the invention considered in conjunction with the accompanying drawings