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. Below is the detailed cable tray installation method statement not only for cable tray but also applicable for GI ladder and trunking for indoor and outdoor applications and in service rooms like pump rooms, electrical rooms and plant rooms etc. Cable tray supports are components used to fix and support. for installing electrical products and systems. The complete text of NEMA's publication is reproduced here, i ation or liability to users of this publication. These guidelines will be useful to engineers, contractors, and maintenance personnel.
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