Electrical and Plumbing Construction Standards for Home Decoration
* Basic Requirements
Only individuals holding an electrician's certificate issued by the national administrative department are allowed to work on-site, and they must strictly follow the relevant national electrical standards and "Hydraulic and Electrical Process Standards" during construction. They must actively seek the homeowner's opinions, patiently listen to their requirements, confirm the positions of power switches, water fixtures, cold and hot water taps, etc., ensuring the homeowner is satisfied before starting the construction process to avoid rework due to insufficient communication.
All main and auxiliary materials used in circuit and water line renovations should be certified by the national authorities.
The strong current, weak current, and water lines laid into walls should maintain a distance of more than 500mm between each other. During construction, exposed wire ends must be wrapped.
After the completion of hydraulic and electrical decoration, the construction personnel should draw up an actual position hydraulic and electrical renovation completion diagram and submit it to the company for archiving.
Electrical Construction Standards for Home Decoration:
Temporary power sources at the construction site should have complete plug heads, switches, sockets, and residual current devices (RCDs), and temporary electricity must use cables.
Power lines come in three colors: live wire (red), neutral wire (blue), ground wire (yellow). All single-phase sockets should be connected with left-neutral, right-live, and middle-ground or top-live and bottom-neutral.
Each room’s socket power supply circuit, anti-collision wall corners, kitchen, bathroom, and bathroom power supply circuits should independently use residual current devices (RCDs) and must not connect their neutral wires to other circuits.
Air conditioners and other high-power appliances must have dedicated power supply circuits. Air conditioners use 4mm square power lines, lighting lines use 2.5mm square power lines, all power socket circuits preferably use 2.5mm square power lines. Other power loads can refer to this standard.
All in-wall wires should use 20PVC flame-retardant pipes buried and connected with elbows, straight joints, junction boxes, etc. There cannot be any connections inside the pipes. Power lines cannot be exposed on the ceiling or directly embedded in cement to ensure that the power lines can be pulled or replaced.
In special cases, when power line pipes pass through the ground, extra attention must be paid to ensure tight connection of the pipes under the ground. There should be no joints in the power lines under the ground. Where the power lines enter or exit the ground, elbows must be used. Before the ground is sealed, the PVC pipes must be well protected against damage or rupture. When laying floor tiles, the PVC pipes should be completely covered by sand. When nailing wooden floors, power lines should be laid along the wall angles to prevent damage from nails.
Power line directions should be horizontal and vertical, avoiding diagonal pulling, and should avoid the installation positions of wall mirrors, shelves, furniture, etc., to prevent damage from electric hammers or nails. When burying power lines, a distance of more than 500mm should be maintained from electric heating, radiators, water pipes, and weak current pipelines.
Power line pipes should be pre-fixed in wall grooves, ensuring that the pipe surface is recessed more than 13mm into the wall (wall groove depth > 33mm).
After inspection and approval, once the power line connections are qualified, the wall should be moistened, and then sealed with 1:5 concrete. The sealed concrete surface should be flat and lower than the wall by 2mm. Socket base boxes should be installed securely, with panels flush and aligned with the wall.
For air conditioning power, 16A multi-hole sockets should be used. Below a height of 1.5m where children can reach, sockets with protective doors should be used. Bathrooms, washbasins, and bathrooms should use splash-proof sockets, installed at a height of no less than 1.3m and away from water sources. For convenience and comfort, double-control switches should be used in bedrooms, and kitchen power sockets should be equipped with parallel switches to control power on/off. Microwave ovens placed in cabinets should have wall-mounted switches controlling power on/off.
There should be more rather than fewer strong and weak current socket interfaces. Power sockets and one telephone socket should be set on both sides of the bedhead. Near computer desks and behind TV cabinets in living rooms, there should be at least three power sockets as well as corresponding TV, telephone, multimedia, and broadband network sockets.
Switch line boxes are generally 1.2 meters above the ground, with one multi-function socket per room.
All sockets and switches should be higher than 300mm above the ground, with consistent heights within the same room (height difference 0.5MQ. Telephone line joints must use dedicated connectors.