f武理工大学《环境工程学》课程设计.docxVIP

武汉理工大学《环境工程学》课程设计 plates for tank lap, not fixed. Protect wires should be left in the ground and slot the compensation allowance. Metal cable trays and support and the introduction of metal cable ducts must be drawn or ground (PE) or zero (PEN) reliable and must comply with the following requirements: 1.1 metal cable trays and support full length not less than 2 in the grounding (PE) or zero (PEN) trunk connections; 1.2 non-galvanized cable bridge between both ends of the connection plates bridged copper ground wire, grounding allowed minimum cross-sectional area of not less than 4mm2; 1.3 galvanized cable bridge across both ends of the connection between the grounding wire, connect both ends of the Board not less than 2 locking nut and lock washer fixing bolts of the connection. Cable trays installed in accordance with the following provisions: 2.1 straight steel cable tray lengths not exceeding 30m, aluminum or fiberglass Cable Tray lengths over 15m with the slip joint; cable bridge spans the building set a compensation slot; 2.2 the bending radius of the cable tray bend, not less than minimum tray cable allows the turning radius, minimum bending radius of the cable shown in the table below; Table cable minimum allows bent RADIUS serial number cable type minimum allows bent radius 1 no lead Bao Gangkai nursing sets of rubber insulation power cable 10D 2 has steel armored nursing sets of rubber insulation power cable 20D 3 PVC insulation power cable 10D 4 make joint PVC insulation power cable 15D more than 5 more core control cable 10D Note: d for cable od 2.3 Dang design no requirements plates for tank lap, not fixed. Protect wires should be left in the ground and slot the compensation allowance. Metal cable trays and support and the introduction of metal cable ducts must be drawn or ground (PE) or zero (PEN) reliable and must comply with the following requirements: 1.1 metal cable trays and support full length not less than 2 in the grounding (PE) or zero (PEN)