Lightning protection and grounding specifications must be read.

According to Document No.43 [2000] of the Ministry of Construction "Letter on Agreeing to Compile Technical Specifications for Lightning Protection of Building Electronic Information System", the Sichuan Provincial Construction Department (the former Construction Committee) is responsible for organizing the establishment of a specification compilation team, referring to relevant standards at home and abroad, earnestly summing up practical experience and soliciting opinions from all parties.

This specification is divided into 8 chapters and 4 appendices. The main technical contents are: 1. General rules; 2. Terminology; 3. Lightning protection zoning; 4. Classification of lightning protection; 5. Lightning protection design; 6. Lightning protection buildings; 7. Construction quality acceptance; 8. Maintenance and management.

This specification mainly stipulates and requires the design, construction, acceptance, maintenance and management of the comprehensive lightning protection project of microbial electronic information system.

The terms marked in bold in this specification are mandatory and must be strictly implemented. The Ministry of Construction is responsible for the management and interpretation of the mandatory provisions of this code, the Sichuan Provincial Construction Department is responsible for the specific management, and China Building Standard Design and Research Institute and Sichuan Zhongguang High-tech Research Institute Co., Ltd. are responsible for the interpretation of the specific contents. In the implementation process, all units are invited to sum up their experience in combination with the actual project. If you need to modify or supplement, please send your comments and suggestions to the Construction Department of Sichuan Province (Address: No.36, Section 4, Renmin South Road, Chengdu, Sichuan Province, Postal Code: 64004 1).

1? general rule

1.0. 1 This specification is formulated to prevent and reduce the harm of lightning to the electronic information system of buildings and protect people's lives and property.

1.0.2 this specification is applicable to the design, construction, acceptance, maintenance and management of lightning protection of electronic information systems in new, expanded and rebuilt buildings.

This specification does not apply to lightning protection of electronic information systems in inflammable and explosive dangerous environments and places.

1.0.3 in the lightning protection design of building electronic information system, external lightning protection measures and internal lightning protection measures should be coordinated and unified according to the characteristics of building electronic information system, and comprehensive planning should be carried out according to the overall requirements of the project to achieve safety, feasibility, advanced technology and economy.

1.0.4 lightning protection of electronic information system must adhere to the principle of prevention first and safety first. If necessary, the lightning electromagnetic environment of the site can be evaluated before design.

1.0.5 the electronic information system should be protected by external lightning protection and internal lightning protection (fig. 1.0.5).

1.0.6 the lightning protection of electronic information system should take corresponding protective measures according to environmental factors, lightning activity law, lightning protection area where the equipment is located, immunity of the system to lightning electromagnetic pulse, damage degree of lightning accident, importance of system equipment, etc. ? 1.0.7 lightning protection of building electronic information system shall comply with relevant national standards in addition to this specification.

2? school term

2.0. 1 electronic information system? Electronic? Information? system

A man-machine system composed of computers, wired/wired communication equipment, processing equipment, control equipment, supporting equipment and facilities (including networks) collects, processes, stores, transmits and retrieves information according to certain application purposes and rules.

2.0.2 Electromagnetic compatibility? Electromagnetic? Compatibility (EMC)

The equipment or system can work normally in its electromagnetic environment without causing unbearable electromagnetic interference to other equipment and systems in the environment.

2.0.3 electromagnetic shielding? Electromagnetic? shielded

Shielding with conductive materials to reduce the penetration of alternating electromagnetic fields into designated areas.

Lightning protection device? Lightning? Protection? System (LPS)

External and internal lightning protection devices.

2.0.5 External lightning protection device? External? Lightning? Protection? system

It is composed of lightning receptor, down conductor and grounding device, which is mainly used as a protective device to prevent direct lightning.

2.0.6 Internal lightning protection device? Inside? Lighting? Protection? system

It consists of equipotential connection system, grounding system, shielding system, reasonable wiring system and surge protector. It is mainly used to reduce and prevent the electromagnetic effect caused by lightning current in the protected space.

2.0.7*** Common grounding system? Grounding? system

Grounding system connecting lightning protection devices, building metal components, low-voltage distribution protection lines (PE), equipotential bonding belts, equipment protection places, shielded grounding, anti-static grounding and grounding devices.

2.0.8 equipotential bonding? Equipotential? Adhesion (EB)

An electrical connection in which the potential of the exposed conductive parts of equipment and devices is basically equal.

2.0.9 Equipotential bonding belt? Equipotential? Combination? Sand bar (low tide)

Metal belt, which is connected with metal devices, foreign conductors, power lines, communication lines and other cables, and is equipotentially connected with lightning protection devices.

2.0. 10 natural grounding body? Natural? Grounding? electrode

It is the general name of all kinds of metal components, metal well pipes, steel bars in reinforced concrete, buried metal pipes and facilities that are used for grounding but not specially set for this purpose and have good contact with the earth.

2.0. 1 1 ground terminal? terminal

Adipic acid will be protected, including equipotential bonding conductor and working grounding conductor (if any) connected to the terminal of grounding device or grounding rod.

2.0. 12 Total equipotential connection terminal board? Equipotential? Grounding? Terminal? Board of directors (MEB)

A metal plate that connects a plurality of grounding terminals together.

2.0. 13 floor equipotential grounding terminal board floor? Equipotential? Grounding? Terminal? Board of Directors (February)

Grounding terminal boards are set in buildings and floors for equipotential connection of local equipotential grounding terminal boards. ? 2.0. 14 local equipotential grounding terminal board? Local? Equipotential? Grounding? Terminal? Board of directors (LEB)

In the computer room of electronic information system, the grounding terminal board is used for local equipotential connection.

2.0. 15 equipotential bonding network? Network (BN)

A conductor network in which the exposed conductive parts of the system are equipotentially connected.

2.0. 16 surge protector? Protection? Equipment (surge protector)

At least one nonlinear voltage limiting element should be included as a device to limit transient overvoltage and shunt surge current. According to the function of surge protector in electronic information system, it can be divided into power surge protector, antenna surge protector and signal surge protector.

2.0. 17 voltage switch surge protector voltage? Switch? Type? (speed)

Surge protector consisting of discharge gap, gas discharge tube, thyristor and bidirectional thyristor. Usually called switching surge protector.

2.0. 18 voltage limiting surge protector? Restrictions? Type? (speed)

Surge protector composed of varistor and suppression diode. It is usually called voltage limiting surge protector.

2.0. 19 lightning protection zone? Protection? Area (LPZ)

The area where the lightning electromagnetic environment needs to be defined and controlled.

2.0.20 Integrated lightning protection system? Synthetic? Protection? Objection? Lightning? system

The building adopts a lightning protection system consisting of external lightning protection measures and internal lightning protection measures.

2.0.2 1 lightning electromagnetic pulse? Electromagnetic? Impulse (LEMP)

Electromagnetic field effect caused by lightning current and lightning electromagnetic field as interference sources.

3? Lightning protection zoning

3. Classification of thunderstorm days in1region

3. Thunderstorm days in1.1area should be classified according to the annual average thunderstorm days.

3. 1.2 Thunderstorm day grades should be divided into less minefield, more minefield and higher minefield, and meet the following requirements:

1 Less mined area: the area with an average annual thunderstorm day of 20 days or less;

2. There are many minefields: areas with an average annual thunderstorm day of more than 20 days and no more than 40 days;

3. High minefield: an area with an average annual thunderstorm day of more than 40 days and less than 60 days;

Four major minefields: areas where the annual average thunderstorm days exceed 60 days.

3. The thunderstorm days in1.3 area are subject to the local annual average thunderstorm days published by the state, as shown in Appendix D. ..

3.2 Division of Lightning Protection Zone

3.2. The division of1lightning protection zone is to divide the buildings that need to protect and control the lightning electromagnetic pulse environment into different lightning protection zones (LPZ) from outside to inside.

3.2.2 The lightning protection zone shall be divided into direct lightning protection zone, direct lightning protection zone, first protection zone, second protection zone and subsequent protection zone (Figure 3.2.2), and meet the following requirements:

1? Direct Lightning Unprotected Zone (LPZ0A): The electromagnetic field is not attenuated, and all kinds of objects may be directly hit by lightning, so it is a completely exposed unprotected zone.

4? Direct lightning protection zone (LPZ0B): The electromagnetic field is not attenuated, and various objects are rarely hit by direct lightning, so it is a completely exposed direct lightning protection zone.

5? The first protected area (LPZ 1): Due to the shielding measures of buildings, the lightning current flowing through various conductors is less than that of the direct lightning protection area (LPZ0B), and the electromagnetic field is initially attenuated, so that various objects cannot be directly hit by lightning.

6? Second protected area (LPZ2): a subsequent protected area introduced by further reducing the guided lightning current or electromagnetic field. ? 7? Follow-up protection zone (LPZn): It is necessary to further reduce the lightning electromagnetic pulse to protect the follow-up protection zone of the third-class high-grade equipment.

4? Lightning protection classification

4. 1 General provisions

4. 1. 1 The lightning protection level of building electronic information system shall be divided into four levels: A, B, C and D according to the interception efficiency of lightning protection devices.

4. 1.2 lightning protection level shall be divided according to one of the following syntax:

1? According to the environment of building electronic information system, lightning risk assessment is carried out to determine the lightning protection level.

2? According to the importance and nature of building electronic information system, the lightning protection level is determined.

4. 1.3 For particularly important buildings, the lightning protection classification shall adopt the two grammars specified in Article 4. 1.2 to determine a higher protection level.

4.2 Determine the lightning protection level according to the lightning strike risk assessment.

4.2. The value of1n (times/year) is determined according to the expected lightning strike times of buildings N 1 and the expected lightning strike times of indoor facilities N2 of buildings, where N=N 1+N2 (see Appendix A for calculation syntax).

4.2.2 The acceptable annual average maximum number of lightning strikes caused by direct lightning and lightning electromagnetic pulse can be calculated as follows: NC = 5.8×10-10.5 times /C (times/year). See appendix a for the calculation syntax.

4.2.3 Compare N and NC to determine whether the electronic information system equipment needs to be equipped with lightning protection devices. 1? When n

2? When n >; During numerical control, lightning protection devices should be installed.

4.2.4 Determine the lightning protection level according to the calculation formula E= 1-NC/N of the interception efficiency of the protection device:

1? When E & gt0.98 hours? first-rate

2? When 0.90

3? When 0.80

4? When E≤0.80? Set at level d

4.3 according to the importance of building electronic information system and the nature of use to determine the classification of lightning protection.

4.3. 1 The lightning protection level of building electronic information system shall be selected according to Table 4.3. 1

The above is the code for lightning protection and grounding of buildings, please read it carefully. Thank you for your attention to Tuba Rabbit Decoration Network.

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