1, cable tray as a wiring project supporting the project, at present there is no special instruction, the manufacturer's specifications programs lack of generality, therefore, the design selection process should appear type and quantity of each system according to the weak cable, reasonable selection of suitable bridge.
(1) determine the direction: according to the building floor plan, combined with air conditioning pipelines and electrical pipelines and other settings, convenient maintenance, as well as the density of cable routing to determine the best route cable bridge. In the room, as far as possible along the walls of the building, columns, beams and floor erection, so the comprehensive utilization of pipe rack erection, should be set up in parallel side or above the pipeline, and consider the lead line and a branch line to avoid cross, such as no other pipe frame borrowing, is required since the establishment (Branch) column.
(2) load calculation: calculate the weight of the unit length on the longitudinal section of the cable bridge main frame.
(3) to determine the width of the bridge cable laying: according to the number and diameter of the cable and cable spacing to determine the type and size of the cable tray, arm length, strut length, spacing, bridge width and number.
(4) determine the installation: according to the fixed place conditions to determine the bridge, suspensory, upright, side wall or mixed type, connectors and fasteners are generally supporting the supply, in addition, according to the bridge structure, choose the corresponding cover.
(5) draw a flat section of the cable bridge, and draw a space map as well as a material list for the local part.
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