They are essential if one is to choose the most economical tray system that fits ones needs.
All figures given represent the maximum permissible uniformly distributed load in kgs.
This is normally 75mm, 100mm, 125mm or 150mm and is determined by the size of the cable to be installed. This figure represents the nominal and bend radius of the fittings inner corner. One choice is usually governed by the minimum allowable bending radius of the cables to be installed in the tray. Occasionally 1200mm radius fittings are required. Used Determining what metal and finish to use mainly depends on the environment the tray will be used in.