Cable trays can be installed in two modes: Layered installation is used as an example to illustrate the installation method. The Cable Tray ng standards, performance standards, test standards and application in this document have been tested extens ompetent professional en completely installed, without damage either to conductors or. Method Statement installation of Cable Trays and Ladders - Planning Engineer FZE. This method statement covers the site installation of the cable tray & ladders and the requirements of checks to be carried out. Establishing partnerships. 6. cable tray assembly, joints and ground bonding).