Cable tray support quantity can be calculated using a simple formula: Support Quantity = Total Length ÷ Support Spacing + 1 20 ÷ 2 + 1 = 11 supports In a typical project, a 20-meter cable tray with 2-meter spacing requires 11 supports. 5 meters length of 17 cables laid on cable tray is 25. weight of 2 numbers of 40x40x5mm size, horizontal GI angle of length 700mm is 5. Total weight. A cable support system consists of cable support lengths and system components, such as cable support fittings, support elements, mounting elements and system acces-sories. The cable support lengths and fittings can basically be designed as cable trays, cable ladders or mesh cable trays, in which. At first, I think, you have to calculate the cable tray load [of cables], to state the type of tray: metallic [steel, aluminum],fiberglass and other,the standard type-for instance according to NEMA VE-1 or IEC 61537 or else, including a safety factor [may be 1. Cable ladder systems and cable tray systems shall be manufactured in accordance with BS EN 61537, channel support. EzyCalculator is an interactive online tool designed to help you calculate safe loads to spans for steel, aluminium and FRP strut and cable support components.