Plumbing and Electrical Installation Diagram for Prefabricated Houses

The plumbing and electrical installation diagram for prefabricated houses should be designed in conjunction with the structural characteristics and usage requirements of the house, and can be drawn with reference to the plumbing and electrical installation specifications for new home renovations and rural self-built houses. The following explains from three aspects: design points, reference content, and precautions:

---

Design Points
The plumbing and electrical installation in prefabricated houses should take into account their modular and lightweight characteristics. The plumbing and electrical lines should preferably be concealed to avoid damaging the structural integrity of the house. For electrical circuits, the locations of sockets and switches should be planned according to functional zoning. For example, the TV background wall in the living room should have reserved sockets for the network, TV, and power supply, while the bathroom should be equipped with splash-proof sockets and a dedicated circuit for the bathroom heater. For water supply lines, the water supply points (such as sinks, toilets, and showers) and drainage slopes should be clearly defined to ensure smooth drainage. At the same time, the pipe diameters, wire diameters, and directions of the plumbing and electrical lines should be marked for easy construction and future maintenance.

---

Reference Content

1. Switch and Socket Layout: Reference can be made to the switch layout diagrams for "single-control", "double-control", and "triple-control" switches in new home renovations to clarify the control methods of switches in different areas (such as double-control switches in bedrooms for convenient nighttime use). The locations of sockets should be combined with furniture placement, such as reserving USB sockets on both sides of the sofa and installing sockets with switches on the kitchen countertop.
2. Wiring for Special Equipment: For the bathroom heater (with heating function), reference should be made to the "5-gang sliding cover switch wiring diagram" to clarify the connection methods of functional lines such as lighting, ventilation, and heating to ensure safe electricity usage.
3. Pipe Embedding Specifications: The practices for embedding plumbing and electrical pipes in rural self-built houses can serve as a reference. For example, water pipes should be connected using PPR pipe hot-melt connections, electrical circuits should be protected by PVC pipes, and strong and weak electrical circuits should be laid separately with a spacing of ≥30cm to avoid signal interference.

---

Precautions

1. Compliance: The design should comply with the "Construction Specifications for Residential Decoration and Renovation Projects" and local standards. For example, electrical circuits should be equipped with leakage protection devices, and water supply lines should undergo pressure testing.
2. Scalability: Reserve a certain number of spare lines and interfaces, such as reserving network interfaces on the living room wall for the installation of smart devices in the future.
3. Construction Coordination: The installation of plumbing and electrical systems should be carried out simultaneously with the assembly of prefabricated house modules to avoid damaging the structure by cutting slots later. For example, reserve pipe channels at the joints of wall modules.

If specific drawings are required, it is recommended to contact a professional designer to conduct refined design in conjunction with the 3D model of the house to ensure that the plumbing and electrical layout perfectly matches the house structure.