Precautions for music fountain construction

1. Before pipeline installation, the pipe chamber should be cleaned, the main pipe should be horizontal, the riser should be vertical, and the main pipe line should be fixed. Before painting the pipeline with anti rust paint, rust and welding slag should be removed first. The installation of the water pump should be firm and stable. 
2. Lighting installation: positioning of lamps, making and installing lamp clips, fixing lamps. 
3. Cable laying and waterproof connection: The cables for pumps and lights are routed according to regulations, with the principle of reducing underwater joints. Cable connections are made using heat shrink tubing for waterproofing, and the cables are centrally threaded into cable conduits. The cables are sealed near the horn mouth, and the pump and light wires are numbered according to the diagram. The cable conduits can be laid along the cable trench to the control room, and then enter the distribution cabinet through the cable tray. 
A、 Before installation, the performance of the water pump, valves, and lighting fixtures must be tested to ensure the integrity of the insulation of the water pump. The resistance should be measured with a megohm meter and should be greater than 50 megohms. 
B、 The wires of lighting fixtures must use waterproof cables, and the joints must be waterproofed according to the prescribed process. The connections must be secure. 
C、 Use a megohmmeter to test the insulation resistance of each circuit, which should be above 5 megohms. 
D、 Check if the grounding wires of the water pump and lighting fixtures are connected. 
4. Installation of power distribution control equipment: Control and distribution equipment are placed in the control room according to the diagram, and load equipment is connected to the corresponding terminals of the distribution equipment according to the cable numbers. 
5. All fountains, background music electrical equipment (including water pumps, lighting fixtures, control cabinets, computers, controllers, frequency converters, transformers, water curtain generators, laser projectors, and other metal casings) must have equipotential grounding, which should comply with national standards (Construction [1998] No. 1 equipotential connection installation) 
A、 The total equipotential connection should be equipped with a total equipotential connection terminal board in the incoming electrical control cabinet, which connects the following conductive parts to each other. ——PE (PEN) busbar for incoming electrical control cabinet - grounding electrode for control room 
B、 Local equipotential bonding plates are installed in the fountain pool to connect the following conductive parts with each other. ——Metal shells for water pumps and lighting fixtures - Metal pipelines for water supply, drainage, and overflow - Main steel bars and metal structures of buildings, including metal brackets for pool grates. 
C、 All fountains, background music electrical equipment (including metal enclosures such as control cabinets, computers, controllers, frequency converters, transformers, water curtain generators, laser projectors, etc.) must have auxiliary equipotential connections. 
D、 The total equipotential connection board (ground bar) and local equipotential terminal board are made of copper plates. The total equipotential connection line shall not be less than 0.5X of the incoming line, with a PE cross-section of the incoming line. The cross-sectional area of the auxiliary equipotential connection wire shall not be less than 4.0 square millimeters of copper wire, or 8mm diameter round steel or 20 * 4mm flat steel shall be used. 
E、 The connection between the conductors in the equipotential bonding line can be made by welding or bolt connection. The lap length of flat steel should not be less than twice its width and should be welded on three sides. The lap length of round steel should not be less than six times its width and should be welded on both sides.