GB 50343-2012Technical code for protection of building electronic information system against lightning (English PDF)

1.0.5 Comprehensive protection combining external and internal lightning protection

measures shall be adopted in the building electronic information system.

1.0.6 Corresponding protective measures shall be taken for the building electronic

information system according to environmental factors, lightning activity routines, the immunity of lightning protection zone (LPZ) and system (where equipment is located) against lightning electromagnetic impulse(LEMP), extent of damage in lightning stroke accidents as well as significance of system equipment.

1.0.7 Protection of building electronic information system against lightning shall not only

comply with those specified in this code but also meet the requirements of the current relevant standards of the nation.

2.0.1 Electronic information system

A man-machine system for the collection, processing, storage, transmission and search of information according to certain application purpose and rule, consisting of computer, communication equipment, process equipment, control equipment, electric/electronic device and its associated support equipment and facility (including network), as well as other electronic equipment.

2.0.2 Lightning protection zone (LPZ)

Specified lightning electromagnetic environment zone

2.0.6 Common earthing system

It refers to an earthing system which is made by connecting the lightning protection system earthing device, building hardware, low-voltage distribution protection wire, equipotential bonding terminal board or bonding bar, equipment protective earthing, shield earthing, electrostatic earthing, and functional earthing, etc.

2.0.7 Natural earthing electrode

A general term for hardware, metal well casing and steel bar in concrete which also have earthing function, but are not arranged specially for this purpose.

2.0.9 Main equipotential earthing terminal board

Metal board connecting multiple earthing terminals that is directly connected with the earthing device

2.0.10 Floor equipotential earthing terminal board

Earthing terminal board which is arranged on the floor of building for the equipotential bonding of local equipotential earthing terminal board

2.0.24 Measured limiting voltage

The maximum peak value of voltage that is measured across the wiring terminals of the SPD during the application of impulses of specified waveform and amplitude

3.1 Classification of Regional Thunderstorm Day

3.1.1 Regional thunderstorm days shall be classified according to the average annual

thunderstorm days.

3.1.2 Regional thunderstorm days shall be subject to the local average annual thunderstorm

days published by the nation.

3.2 Division of Lightning Protection Zone

3.2.1 Different lightning protection zones shall be divided for the buildings requiring

protection and control of the LEMP environment according to the requirements of 3.2.2 of this code.

3.2.3 The protected objects shall be placed in the lightning protection zones that the electromagnetic properties are compatible with the tolerance capacities of such objects.

4.1 General Requirements

4.1.1 Risk assessment may be carried out for the building electronic information system

according to the methods specified in 4.2, 4.3 or 4.4 of this code.

4.2 Determine Lightning Protection Level by Efficiency of LPS

4.3 Determine Lightning Protection Level by the Importance, the Application and the Value of building Electronic Information System

4.3.1 Lightning protection level may be determined for the building electronic information

system by the importance, the application and the value of the system according to Table 4.3.1.

4.4.3 Risk of lightning damage to the building, R, shall be calculated according to the requirements of risk management, which shall be compared to the allowable value of risk.

5.1 General Requirements

5.1.1 Building electronic information system should be subjected to risk assessment and taken with appropriate protection measures.

5.1.2 The electronic information system, if necessary, must be taken with equipotential bonding and earthing protection measures.

5.1.5 For expanded and renovated engineering, both the above-mentioned data and the following related data shall be collected.

5.2 The Equipotential Bonding and the Common Earthing System

5.2.1 The electronic information equipment in machine room shall be subjected to equipotential bonding whose structure type shall adopt S-type, M-type or their combination (Figure 5.2.1).

5.2.2 At the junctions between LPZ0A or LPZ0B and LPZ1, main equipotential earthing terminal board shall be provided and be connected with earthing device for at least two points;

a floor equipotential earthing terminal board should be provided in each floor; the electronic information system equipment room shall be provided with local equipotential earthing terminal board (LEB).

5.2.4 For especially important building electronic information system, a special vertical earthing trunk line, led from the main equipotential earthing terminal board and connected with the steel bar or pressure-equalizing strap in each floor of the building, may be set up. The earthing terminal board for each floor shall be connected with the earthing trunk line.

5.2.7 The earthing wire of room equipment shall not be directly introduced from lighting receiving belt, iron tower and lightning protection downlead.

5.2.8 The metallic pipeline entering into building (including metallic pipes, power and signal lines) shall be connected to the equipotential bonding terminal board nearby at the entry. Adaptive power supply and signal SPDs shall be installed at the LPZ1 entrance so as to fulfill the equipotential bonding of the live conductor of electronic information system.

6.1 General Requirements

6.1.1 The lightning protection construction of building electronic information system shall be carried out according to the requirements of this code and approved construction design documents.

6.1.2 The lightning protection construction apparatus of building electronic information system shall comply with the relevant current standards of the nation and shall be provided with qualified certificates.

6.1.3 Builders of lightning protection construction shall be certified.

6.1.4 Test instruments and measuring tools shall be verified qualified and used within the validity period.

6.2 Earthing-termination System

6.2.1 Artificial earthing electrode should be embedded more than 1m out of the apron slope

around the building, and its embedded depth shall not be less than 0.5m. Artificial earthing electrode in tundra shall be embedded below the frozen soil layer.

6.3 Earthing Conductor

6.3.1 At least two connecting conductors shall be leaded out of the earthing device via different places to be connected with indoor main equipotential earthing terminal board. The joint of the earthing outgoing line and the earthing device shall be welded or heat sealing. The joint point shall take anti-corrosion measures.

6.3.5 The connection of such natural earthing electrode as earthing conductor and metal pipeline shall adopt reliable electrical connection method according to its process characteristic.

6.4 Equipotential Earthing Terminal Board (Equipotential Bonding Bar)

6.4.1 Equipotential earthing terminal board shall be installed at the interfaces of LPZ with material specifications meeting the design requirements, and be connected with earthing device.

6.5 Surge Protective Device

6.5.1 The installation of power circuits SPD shall meet the following requirements.

7.1 Inspection

7.2 Items for Acceptance

7.2.1 Earthing device acceptance shall cover the following items.

7.2.2 Earthing conductor acceptance shall cover the following items.

7.2.3 Equipotential earthing terminal board (equipotential bonding bar) acceptance shall

cover the following items.

7.2.4 Shielding Facility acceptance shall cover the following items.

7.3 Final Acceptance

7.3.1 After the completion of lightning protection projects, acceptance shall be carried out

by representatives of the organizations concerned.

7.3.2 During the final acceptance of lightning protection projects, items passing the follow-up testing shall not be rechecked again. If the acceptance team holds it is necessary, it may be rechecked.

7.3.5 Upon the completion of lightning protection projects, the construction organization

shall provide the following documents and data.

8.1 Maintenance

8.1.1 The maintenance of lightning protection device is divided into periodic maintenance and routine maintenance.

8.1.2 A thorough and periodical testing shall be carried out before the coming of thunderstorm season each year.

8.1.6 The earthing resistance of the earthing device shall be tested; if the test value is greater than the specified value, the earthing device and soil conditions shall be inspected to find out the reason for change and effective rectification measures shall be taken.

8.1.7 The electrical continuity for the equipotential bonding of internal lightning protection device and equipment (metal shell and rack) shall be tested, if the bonding position is loose or disconnected, it shall be repaired timely.

8.2 Management

8.2.1 The lightning protection device shall be managed by full time or part time personnel familiar with the lightning protection technology.

8.2.2 Management system shall be established after the lightning protection device has been

put into service. The design, installation, concealed work information and drawing, annual inspection test record of lightning protection device shall be timely filed and kept well.

8.2.3 After the lightning stroke accident, damage caused by thunder shall be investigated

timely, analyze the reasons, put forward improved measures and report to competent departments.