For ladder cable trays supporting large power cables, 9-inch or wider rung spacings should be selected. Cable Tray Installation Spacing plays a huge role in the safety, efficiency, and reliability of electrical systems. If the spacing between trays is too large, it can create serious issues. In this guide, we'll explore why the spacing might be too wide, the problems it causes, and practical. Ladder cable tray is available in widths of 6, 9, 12, 18, 24, 30, 36, 42 and 48 inches with rung spacings of 6, 9, 12 or 18 inches. Under. The cable support lengths and fittings can basically be designed as cable trays, cable ladders or mesh cable trays, in which cables are routed. Fittings can, on the one hand, be used for horizontal or vertical changing of the routing direction or, on the other, to change the height or width of the. Cable trays are often treated as an afterthought, which leads to issues like insufficient space or improper routing of cables. Collaborate with professionals or consult reliable manufacturers like JP. The spacing stated for horizontal runs may be applied also to runs at an angle of more than 30 Degrees from the vertical. Note: At the point of change from vertical to horizontal and horizontal to.