【 Weak current College 】 laboratory must focus on a few big problems

Summary: this article on computer labs in fire prevention, guards against the static electricity, electricity and wiring to explore four major problems.

Keywords: fire prevention; static electricity; electricity supply; wiring

Introduction

College computer lab has a computer lab and hands-on learning of the pupils. Because of the particularity of the computer laboratory, computer lab and the importance of the site design is increasingly important for security. In order to ensure the normal operation of the computer equipment and staff to have a good working environment, the security system is a computer laboratory building engineering systems absolutely essential. Computer lab in the construction process on fire prevention, guards against the static electricity, electricity, wiring problems should not be overlooked.

First, fire prevention

Fire is all kinds of computer room may encounter various disasters occur most frequently, against one of the greatest disasters. In the event of fire, direct harm to the people, equipment, and valuable information. Therefore we in the engine room construction should take into account the issues of fire safety:

1) to the computer room, library, activities under the floor, ceiling, and air-conditioning piping combustibles near set fire alarm installations. Conditional room, press area and equipment distribution installed smoke, temperature detector, comprehensive monitoring different regional space in order to discover the disaster, to take measures. Should set the halon 1301 12l1 or fire extinguishers. The prohibition of the use of water, foam, dry chemical or secondary damage of fire extinguishing agent.

2) computer room decoration materials should meet rrJ16 ("architectural design fire protection standard") of nonflammable material and non-burning material, should be dampproof, sound-absorbing, non-dust, anti-static and anti-radiation, etc. Engine room fire resistance ratings should not be lower than the TJl6 — 74 2 fire resistance rating. Located at Taobao, the computer room's ceiling and walls should be A level of repairs materials, flooring and other decoration should be not less than B1 level of repairs materials. Room decoration should be can't hermetically, dust, easy to clean, and changes in temperature and humidity under deformation small material, wall and ceiling surfaces must be smooth, reduces dust accumulation.

3) computer room security export, should not be less than two, located in the engine room at both ends. . Engine room should be set to evacuation exit direction to open and close automatically fire doors. And should ensure that in all cases be open from the engine. Export clearly marked evacuation route and directions sketch. Fire channel not pile up incidentals and inflammable, not blocking fire evacuation channels, so that when the safe evacuation in case of fire.

4) in the engine wiring must be properly noted fire performance, cables and other electrical pipes through the floor or wall, you must use the refractories and wall. Power lines and strong electric lines to separate sets of Baidu included cables, electrical wiring to minimize the connector to stop because of the bad phenomenon caused by circuit brand impact. Room all power cords should be used copper-core cables, connectors, junction boxes installed closed; power line section should be commensurate with the load, no overload operation; conditional room, can be used for the socket. This kind of socket shell for aluminum alloy, with anaerobic factor, fire behavior, has an excellent pressure resistance, heat resistance and resistance to moisture characteristics.

2. electrostatic problems

Electrostatic energy generally is not big, but the potential is very high, will form a very strong electric field, if you do not pay attention to prevention, will interfere with the network system, which enables the system to run a random failures. -Anti-static, our room construction process, you should note the following:

1) decoration without using prone to static electricity of decorative materials. Ceiling and wall materials should use anti-static materials made of materials. Anti-static floor surface installation, can effectively prevent electrostatic accumulation. Conditional to the erection of antistatic ground wire to the Earth through the ground flow of people, lower voltage, reduce static electricity.

2) host of activities in the room the floor can be used by steel, aluminium or other flame retardant material. Activities of the floor surface should be conductive, non exposed metal parts. Cell active floor system resistance shall be in accordance with current national activities in the computer room with floor-technical specifications.

3) Earth is the most basic electrostatic prevention measures. Electrostatic grounding can limit resistor and its connector and grounding device. In an explosive and fire hazardous environment, to prevent static energy relief caused the explosion caused by electrostatic spark fires, current limiting resistor value is appropriate. Electrostatic grounding connector should have enough Chinese accounting mechanical strength and chemical stability. A condition of the engine may be laying and copper network and metal doors and Windows and equipment casings and grounding do equipotential connection, set the static electricity leak out.

4) using the metal plate (usually with steel or aluminium) to the room interior walls do closed-end covered, you can cut off the static noise intrusion, also protects against electromagnetic exposure and external electromagnetic interference.

5) if the room humidity is too low, it is extremely easy to generate static electricity. The engine air relative humidity should select in RH 40% ~ 60%. Therefore conditional South room, can be equipped with suction device; the North room should be equipped with spray equipment.

3, power supply problems

Computer system components for the power generated by the fluctuation and are very sensitive to disturbance. Computer system for power quality, and connectivity requirements are high. The computer room of the electrical system is a computer network system can guarantee the normal operation of the premise. We must consider in building:

1) engine room power load rating and electricity demand to meet the supply and distribution system design specifications (GB50052-95). In the design of the engine room of the supply and distribution system but also the computer system has the possibility of diffusion, upgrades, etc. and reserved buffer capacity.

2) to improve your computer device's power supply and distribution system reliability, best technical measures is to provide uninterruptible power systems UPS. Maximum meeting room equipment to power quality requirements. UPS has the function of the frequency regulator and resistance to stemInterference ability. Power supply power supply shall meet the following requirements: frequency: 50 ± 1Hz voltage: 380V/220V changes spoke degrees (%): 15 ~ + l0 phase: phase 5 wire or three-phase four-wire or single phase and three-wire system. Waveform distortion rate (%): ¡ü ¡à 10

3) engine room should be provided by the low voltage system of power supply circuit, independently set up a dedicated distribution box. Computer equipment of power supply lines and other auxiliary equipment of distribution lines shall not be separated from the setting to reduce the condominium computer electromagnetic interference.

4) to reduce intermediate links. Computer system in each unit consists of various devices from their electrical outlets, should be plugged into the same power supply line, between the various units to reduce noise interference, also to provide a common Earth point.

5) power in accordance with the building mine design code requirements, take the overvoltage protection measures, a dedicated distribution board power cable into the cable should be used, had to adopt the overhead wire, low-voltage overhead power lines or dedicated power transformer LV distribution bus bar voltage is set at the surge arrester.

6) distribution box into line should meet: FireWire and zero wire diameter is more than copper conductor cable 6ram, ground wire cable for 2.5mm above copper conductor. Distribution box set with leakage protection air switch, each phase is not less than 40A, air conditioning individually set air switch, switch or the prohibition of the use of zhadao without any functional electrical devices of insurance.

7) in the engine room the power distribution system should take into account and the emergency lighting system with automatic switching and a fire protection system of linkage.

4. wiring problems

Wiring should respect the relevant industry standards, and medicine laboratory, clean but there are rules to cabling.

1) power cord laying application packet received, the whole point of the actual situation of laboratory into several groups, by one air switch control. Use standard power sheathed cord around every 1.5m receiving a three-prong socket as a point, and then uses the number of people receiving porous socket and guarantee reliable grounding.

2) network cabling in a spirit of general planning, centralized operation of fully reflect the system's technology advancement, safety and reliability, good open and scalability. Use of AMP-unshielded twisted-pair cable; each root network cable RJ45 Crystal on both sides of the head should be strictly in accordance with the standard production.

3) room in pipelines should be concealed when the pipelines need to wear the floors, yishe technology shaft. Electric cable and computer room communication power cable to keep a certain distance. Room floor at the bottom of the power cable should be as far away from the computer signal line, avoid laying side by side, take the appropriate measures of shielding. Computer information systems of various device alignment with air-conditioning, power device no electromagnetic shielding parallel alignment. Crossover, you should try to get closer to the vertical angle of the cross, and to take measures against yanran. Computer information system grounding of special ground. Dedicated ground lead should and building steel fabric and all kinds of metal pipe insulation.

4) line of cloth General alone trunkings. Weak lines in the middle is not allowed to have side discharge, the strong electricity and weak lines in the horizontal direction and to maintain the alignment 10era ~ 30era distance, the strong electricity and light current pipeline vertical cross their respective set of metal pipe to avoid the strong electricity on electronic interference.

5) designed to provide power in chapai location and structure of the computer desk, keep in mind the power and network cable can not be exposed, not easy to be kicked into place, reasonable arrangements for table row spacing between fully retained students walking space. Safety and security of the computer laboratory is the laboratory can guarantee the teaching work smoothly. Our room construction process should take full account of the security issues that have a thorough understanding of the national design specification of the main points and actual needs, the infrastructure to do careful careful, scientific, rational building computer lab.