C-Channel Swage Ladder
RUNG SPACING (center-to-center)
Atkore Cable Ladder Features Important Industry - Leading Features:
RUNG
RUNG SPACING (center-to-center) Tangent as referred to on cable tray fittings is the straight at the end of the curve to accommodate a flat splice plate. Zero Tangent SIDE RAIL Fittings facilitate installation when parallel cable trays must be located at minimum distances from each other, such as motor control centers and switch gear centers. Zero tangent fittings can save up to a minimum of 6" per row of tray. 3. Ladder Rung Cable Ladder System Process LOAD DEPTH SIDE RAIL HEIGHT The heart of the Atkore design is the tubular rung and its connection to the side rail by cold swaging… a process where special machinery compresses and locks the tubular rung material around both the inside and outside of WIDTH LENGTH the cable tray side rails. This connection is made without the use of heat, which can potentially disturb the molecular structure of the metal and weaken it. R 2R The tubular rung is flattened during the swaging process to ensure a proper cable bearing surface. Testing - The superior strength of the swaged ladder tray system has been verified in independent testing conducted by the Pittsburgh Testing Laboratory. Pullout loads of 2500 lbs were reached. Other tests show the same type rungs, when welded, had a 35% lower pullout load. The TANGENTS LOAD DEPTH pulls the plate flush with the side rail. The fasteners are snug and the joint is superior structurally and electrically. Even when tightened by hand, there is 1. Universal Curvilinear Splice Plate System The splice plates for rigid connections have a slight curve so they can be used on straight sections or fittings. Tightening of the fastener pressure on the fastener to hold it securely. Note: Heavy Duty, Mid-Span Splice Plates SIDE RAIL HEIGHT WIDTH available upon request . 2. Zero Tangent Fittings
TOP FLANGE (stiffened type shown) strength of the swage also maintains the 90° relationship of the rungs to the side rail. The tubular rungs, which are very stiff, transmit the cable loads to the side rails resulting in much less deflection than in a similar system with welded rungs. For a copy of the independent test results, please contact the factory at atkore.com. Ladder Advantages - SIDE RAIL WEB BOTTOM FLANGE Cold swaging allows for the side rails to be turned outward, simplifying cable installation, and provides 100% access to the cables. The cold swaging yields the most rigid tray system in the industry. The swaged rung connection resists stresses LENGTH
SIDE RAIL
TOP FLANGE (stiffened type shown) in all directions: up or down, side to side, or in and out. The swaged ladder also resists the camber and warping effects encountered in a typical welded system. RUNG R 2R
SIDE RAIL WEB TANGENTS The increased rigidity means that a 24' section of tray can be lifted on one end with little or no twisting or bending of the tray section. This rigid construction makes the trays safer for field personnel to handle and reduces shipping damage. BOTTOM FLANGE Electrical Properties - Electrically, the 106 tons of pressure in the swaging process virtually eliminates the interstices and a homogeneous electrical path results. Resistance of Atkore Aluminum Swaged Tray: 31 microhms Resistance of Atkore Steel Swaged Tray: 37.3 microhms Resistance of Popular Aluminum Welded Tray: 101 microhms Conclusion - Cold swaging yields a very strong, efficient and aesthetically pleasing system that has stood the test of time and offers installation savings due to its ease of handling.
Ladder Cable Tray System - Overview
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