Tell me specifically what are the precautions for water and electricity renovation? Which water or electricity should be changed first?

Be cautious in water and electricity construction. Material management in the current building materials market is not standardized. When purchasing water and electricity materials such as wires, switches, lamps, and water supply pipes, do not go for cheap. Buy products from regular manufacturers, and carefully check the quality of the products. Whether the production license, business license, test report, 3C certification and other information are complete, and a formal invoice must be issued. During the water and electricity construction process, the following points should be paid attention to: 1. Do not damage the original electrical wires and pipes or plumbing pipes when drilling holes. When laying electrical pipelines, use conduits and do not bury wires directly in the ground or walls. This is not only unsafe, but also cannot be repaired once damaged. After the plumbing pipes are laid, a pressure test must be carried out. After passing the test, the next process can be carried out to prevent damage caused by water leakage in the pipes. 2. For areas that need to be waterproofed, such as kitchens and bathrooms, a closed water test must be done after the waterproofing is completed. After passing the test, they can be reposted. 3. Wire joints must be tinned. It is recommended that the joints in the kitchen and bathroom be waterproofed. The joints can be wrapped with high-voltage self-adhesive tape and black tape. 4. Lamps weighing more than 3 kilograms must be fixed on bolts or embedded hooks, and wooden wedges are prohibited. The metal shell of lamps with an installation height less than 2.4 meters must be protected and grounded, and waterproof sockets must be used in bathrooms. There are four main aspects to pay attention to in hydropower construction: 1. The design must be reasonable. The direction of water circuits must be reasonable, safe, practical, and have protective measures. 2. Materials must be qualified. Water and electricity materials must be regular brand products. 3. Construction must be standardized. All wires must be passed through pipes, elbows must be used at joints, and ground wires must be handled according to regulations. 4. The acceptance must be rigorous. All hydropower construction techniques must be in place and comply with construction specifications. The acceptance inspection of hydropower projects should be meticulous. The acceptance inspection of hydropower projects mainly includes inspections during construction and delivery inspections. Inspection during construction. For those processes that will have a serious impact on the entire process if the construction is not up to standard, they must be inspected after completion. Such as the waterproofing of kitchens and bathrooms, and the water and electricity pipelines buried in the ground. If after the floor tile construction is completed, it is found that the waterproofing is not up to standard, the electrical wires and pipelines are blocked, the plumbing pipes are blocked or leaking, then they can only be reworked.