Planning, as the name suggests, is a relatively comprehensive and long-term plan formulated, which is the thinking and consideration of the future integrity, long-term, and basic issues, and the design of a complete set of actions in the future. Before the construction of the laboratory, many contents must be planned in advance. Whether it’s a new construction, expansion, or reconstruction project, the planning and design of the laboratory is no longer just to buy reasonable laboratory furniture and equipment, but also to consider the overall planning, reasonable layout and graphic design of the laboratory, strong and weak electricity, Infrastructure and basic conditions such as air supply, ventilation, air conditioning, environmental protection, air purification, safety measures, water supply and drainage. Since this is a systematic project involving many majors, it is necessary to be proficient in laboratory use knowledge and architectural knowledge as a basis. In the design of various systems in the laboratory, electrical design is a design that is directly related to the safety of the laboratory. It is also the object of focus in the design.

This article is made by CEIDI Xidi on the laboratory electrical engineering system planning and related science. Electrical design is a profession with a strong logical relationship, and designers need to calculate the current of each loop in the laboratory. Make relevant judgment arrangements based on relevant information such as the current loaded by the loop and the type of load. The electrical engineering design of the laboratory includes two aspects of strong and weak electricity. The strong current mainly includes instrument power, lighting sockets, etc., and the weak current includes: network, data communication, broadcasting, video surveillance and so on.

When designing the laboratory plan, the designer of CEIDI will communicate with the owner in advance. In terms of strong electricity: according to the function of the laboratory and the owner’s needs, the total power of lighting, equipment and equipment, combined with the calculation of the air-conditioning system configured in the laboratory Strong electric power, launch strong electric design. They will perform statistics at the level of function rooms, floors, and the entire building. Each instrument room is equipped with a separate room terminal distribution box, and the main instrument needs to leave a separate loop, which cannot be connected in series with room lighting or other sockets. This is mainly to facilitate the use and maintenance of equipment. The floor distribution box should be placed in a dedicated power distribution room, with door locks, and special personnel should be required to manage it. Equipped with UPS (uninterruptible power supply) in the laboratory to provide protection for the main equipment in the laboratory. Determine the power and current

parameters of the uninterruptible power supply according to the power parameters of the laboratory equipment. It should be noted that the selection of the uninterruptible power supply should reserve enough space for laboratory development, and consider the possibility of adding equipment to the laboratory in the future and planning to purchase equipment And then fully reserve the distribution load. The electrical plug can be designed on the wall or the ground according to the needs. The ground electrical plug should be waterproof to a certain degree, and the location of the electrical plug should be close to the powered instrument, reducing the ground wiring and making the laboratory more tidy. Because the uninterruptible power supply has heat dissipation and high noise, an independent power supply room was set up in the rear of the laboratory and a special air conditioner was installed in the room. In terms of weak current: According to the development requirements of modern laboratories and the development trend of technology, it is recommended that the main room should be designed with multiple network communication ports and at least one telephone interface; the laboratory planning and design stage needs to design the camera in the main channel for laboratory management and monitoring, and conditions Each room can be designed, and even important precision instrument rooms can be strengthened by camera monitoring.

1. Chinese voltage standard, AC three-phase five-wire power supply 380V, 50HZ, (red A, green B, yellow C, black 0, two-color protective ground). AC single-phase three-wire power supply 220V, 50HZ, (red fire, black 0, two-color protective ground).

2. Reasonably design the laboratory's electrical equipment, and use copper core BVR and BV for the layout of the circuit and wire. The diameter of the wire and the size of the switch are calculated according to the electrical capacity.

3. Separate circuit for larger load electrical appliances, and design corresponding automatic protection switch.

4. Power supplies for valuable instruments and precision instruments, design AC voltage stabilizing devices or set up isolated power supplies to ensure safe and reliable operation of the instruments.

5. All sockets and electrical enclosures must be well grounded to ensure personal safety.

6. Reasonably design air-conditioning and lighting. Reasonably design the electric heating device to achieve the purpose of safe and reliable use.

In summary, the design of the laboratory power supply system should be carried out in conjunction with the planning and design of the laboratory, as well as the development trend of modern experimental technology and institutional construction. There are still many details, and experienced designers will fully grasp the entire process control process.