Splice plates are the most widely used method for connecting cable tray sections in straight runs. We fix them with nuts and bolts through the holes in the plate and the tray sides. The Ladder Tray features light, rugged, tubular steel construction. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. Cable tray systems are engineered support structures designed to route, support, and protect insulated electrical cables used for power distribution, control, instrumentation, and communication. Think of it as a sophisticated “highway” for cables, keeping them organized, protected, and easily accessible.