How to choose the trough type cable tray product

How to choose the trough type cable tray product

Trough type cable tray used in a corrosive environment, should be manufactured using corrosion-resistant rigid materials, or take anti-corrosion treatment, anti-corrosion treatment should meet the requirements of the engineering environment and durability.In the section with fire requirements, the cable ladder tray and frame can be added with fire-resistant or flame-retardant board, net and other materials to form a closed or semi-closed structure. And take measures such as painting fireproof coating on the surface of the cable trough and its cable tray support hanger(ceiling support,suspension support,cantilever bracket,wall bracket,base bracket), its overall fire resistance should meet the requirements of the relevant national norms or standards.In places with high engineering fire protection requirements, should not use aluminum cable trays(aluminum alloy cable tray). The choice of width and height should meet the requirements of the filling rate, the filling rate within the ladder cable tray and cable trough of the cable in general. Power cables can be 40% to 50%, control cables can be 50% to 70%, and it is appropriate to set aside 10% to 25% engineering development margin. When choosing the load level of the cable trays, the working average load of the cable tray should not be greater than the rated average load of the selected load level of the cable containment, if the actual span of the support hanger of the cable tray is not equal to 2m, then the working average load should meet the requirements. Various components or cable tray fittings,strut channel and support hangers (unistrut, c channel, u channel, channel strut) should be matched with the straight section and bend-through series of cable rack and ladder racks under the condition that the corresponding load is satisfied. In the selection of the cable tray bend through or inner riser, outer riser,lead down device, should not be less than the cable tray (gl cable tray, hdg cable tray, mesh cable tray,perforated cable tray, ventilated cable tray) within the cable very small allowable bending radius. For span greater than 6m steel cable containment and span greater than 2m or load-bearing requirements greater than the load level D aluminum cable trunking, should be in accordance with engineering conditions for strength, stiffness and stability of the calculation or test verification. Several groups of cable trays laid in parallel at the same height, the adjacent cable trays should be considered between the maintenance, maintenance distance.