Non-penetrative cable tray supports are designed to protect lightweight modern roofs and offer a range of benefits. The cables are kept safe, secure and above roof level so are protected from water pooling, avoiding trip risks as well as preventing cabling being damaged from any footfall on the. The PHP Cable Tray Support is designed for cable systems of various widths at most specified heights above the roof surface. Space. 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. All materials intended for cable tray, ladder and. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. Traditionally, facilities have chosen to bundle cables and rig them up in a way that offers little protection, or run cables through a tube-like electrical conduit system, which make it. The use and installation of cable trays is covered by legally enforceable OSHA regulations in 29 CFR 1910. 305(a)(3), or comparable standards promulgated by States operating OSHA-approved State plans. In addition, this document contains several references to provisions of the National Electric Code.