Installing Cable Tray

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combining two cable traysOur wireway cable tray systems require only one tool and very few accessory items for installation. The wireway systems are pre-fabricated junctions / intersections that reduce man-hours by eliminating cutting and fabrication in the field with center hung trapeze, wall or floor mount accessories. These metallic surface raceways are prepared to handle the toughest installations.

Cable-Mgr should be installed from the originating head-end i.e., the electrical or telecommunications closet. Once the pathway has been established, it is important the layout of the pre-fabricated junctions be installed first.
Tray widths 12 inches or less have junctions that are 2 feet in length, while tray widths greater than 12 inches are 3 feet long. This allows for field measurements to be taken before installing the cable tray.

If the straight sections are installed first, it will cause unnecessary field adjustments. Each section has loops at each end. When the sections are connected, the loop on the bottom aligns under the galvanized masked area of the adjoining section. The loop on the side slides into the outside loop guide. Once the trays are aligned, install the 5/16 inch carriage bolt (included) through the loops with the treaded end to the outside of the tray. Install and tighten the flanged nuts with a 1/2 inch socket. This reduces the chances of damage when pulling the cables. Elevation may be adjusted by using pre-fabricated drop with universal hooks or individual straight sections with universal hooks and extenders). Adjust the length with the Cable-Mgr.* cable tray extensions CM-58). The extensions fit into the side guides facilitating adjustment of the tray up to 6 inches on each end. It is not recommended that the cable tray be cut as it will interfere with the grounding characteristics and UL classification.

 

Illustrations and Instructions for Cable Tray Elevation Change CM35, CM25 and CM15 Drop

During some installations, it may be necessary to make an elevation change under or over an obstruction. This is accomplished by using a Drop. The Drop connects to a section with universal loops acting as a hinge. Set the desired angle, insert bolts, and tighten the hex flanged nuts. Powder-coating should be removed to ensure ground continuity.

 

 

Illustrations and Instructions for Cable Tray Extension using offset loop. CM-58

During some installations, there may be sections that do not meet. The offset loop was designed for this. It is critical that the cross-sectional diameter of the offset loop and the cable tray or junctions be the same diameter to insure proper contact surface alignment. The off-set loops bolt to the existing loops on the tray. When attached to each end of a section, a lateral adjustment of up to 12" is possible. To adjust, slide the cable trays, junctions or offset loops to meet and then tighten the flange hex nuts. This same method is used to lengthen the cable tray drops if needed.

cable trays with universal loop
cable trays with offset loops

 

 


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