For horizontal cable tray runs, supports are generally spaced according to the tray manufacturer's recommendations, typically 1.5 to 3 meters apart, depending on the tray material, load, and cable type . For vertical runs, the spacing is usually shorter, around 1 to 2 meters, to prevent excessive stress on the cables and maintain stability . When a run changes from vertical to horizontal or vice versa, supports should be placed on either side of the bend, and the cable's minimum bending radius must be respected .
For long vertical runs exceeding 32 meters, strain relief sections should be incorporated. This is typically done by offsetting the cable by at least 2 cable diameters for each strain relief section, ensuring that only one fixing is offset from the main vertical run . For extremely long vertical runs over 100 meters, additional measures such as short horizontal sections (at least 1 meter) are recommended to relieve tension and prevent cable damage .
In flexible support systems, such as J-hanger installations, the distance between supports must be calculated to achieve a set deflection or offset. An initial offset of around 2% is usually applied to prevent sagging and maintain cable integrity .
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