Environmental requirements for the use of cable trays
(1) Bridges, cable trays, and their supports and hangers used in corrosive environments should be made of corrosion-resistant rigid materials or treated with anti-corrosion measures that meet the requirements of the engineering environment and durability.
(2) In sections with fire protection requirements, cable trays can be equipped with fire-resistant or flame-retardant materials such as plates and nets to form closed or semi closed structures. Measures such as applying fire-resistant coatings on the surface of the tray and its supports and hangers should be taken, and the overall fire resistance performance should meet the requirements of relevant national regulations or standards.
(3) Aluminum alloy cable trays should not be used in places with high fire prevention requirements.
(4) The selection of bridge width and height should meet the requirements of filling rate. In general, the filling rate of cable ladder can be 40% to 50% for power cables and 50% to 70% for control cables, and a 10% to 25% engineering development margin should be reserved.
(5) When selecting the load level of the ladder, the working uniform load of the cable tray should not exceed the rated uniform load of the selected cable tray load level. If the actual span of the support and hanger of the cable tray is not equal to 2m, the working uniform load should meet the requirements.
(6) Under satisfactory load conditions, the specifications and dimensions of various components and support hangers should match the straight sections and bending series of pallets and ladders.
