If necessary temporary supports shall be installed for rigging of the pulling equipment. Care must be taken when rigging supports from existing structures. Proper radius pulling wheels shall be used and adequately supported.
Maximum tension and sidewall pressure shall be considered in the rigging of the cable pull. Cable manufacturer data shall be used in the design of the cable pulls. Cable installation shall be performed per recommended methods and requirements of NEMA VE 2.Recorded data shall be made available for representative review. A tension meter/recording device shall be used with all cable and wire pulls.The installation of low voltage cable shall be performed using industry accepted methods and tools manufactured for the pulling of wire and cable.To properly facilitate pulling a sufficient amount of cable jacket, insulation and any other material shall be removed to expose the bare conductor. Pulling of medium voltage cable in cable tray shall be performed by using conductor for pulling, not insulation or cable jacket.Where drawing details dictate, laying of cables and spacing shall be maintained in trays as shown. Cables shall be installed in a neat and workman like manner. Cables shall be installed in the proper cable trays as identified on the contract drawings.All cable tray conduit drop-outs shall be bonded to the cable tray according to with grounding bushing on conduit end and bonding wire bolted to the cable tray with a compression lug.Ĭable Installation Guidelines for Engineers.Cable trays shall be grounded at least every 15 m (50 ft) and at both ends for Cable Tray Installation Guidelines for Engineers.All cable tray systems shall be bonded together with bonding jumpers. A bonding jumper shall be installed at each expansion joint according to standard approved document.
Cable trays shall be fastened to the support system using guides that allow for longitudinal movement. Cable tray installations shall be installed so connectors are not located in center points of span between supports or directly on supports. Cable tray supports shall be located so that connectors between horizontal straight sections of tray fall between the support point and the quarter-point of the span.Cable tray elbows shall be supported per NEMA VE 2 requirements.Cable trays shall be installed according to the latest revision of the NEC, NEMA VE 2, and manufacturer’s installation instructions.Cable Tray Installation Guidelines for Engineers
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