In conclusion, the traditional guideline suggests bracket spacing of approximately every 1 to 1. Put simply, the support spacing is the distance between the brackets. screw tie) is used to external fastening element fasten support elements to supporting parts of the build-ing structure and, in the sense of the standard, is not a part of the cable support system and is thus. us-trations without notice. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. 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. The spacing stated for horizontal runs may be applied also to runs at an angle of more than 30 Degrees from the vertical.