GB 50057-1994Code for design protection of structures against lightning (English PDF)

Foreword

In accordance with the requirements of "Notice on Printing and Publishing 'Development and Revision Plan on Engineering Construction Standards and Codes (Batch 1) in 2005"' (Jian Biao Han [2005] No. 84), this code is revised from "Design Code for Protection of Structures Against Lightning" GB 50057-94 (2000 edition) by China IPPR International Engineering Corporation jointly with the organizations concerned.

In the revision of this code, the code drafting group seek advices by internet and contacting with the organizations and individuals concerned after completing the exposure draft hereof; and finally finalize it upon review after completing the draft for examination on the base of the advice gained.

This code comprises 6 Ahapters and 9 Appendixes, and the main contents cover. general provisions, terms, classification of structures to be protected against lightning, protection measures for structures against lightning, protection system, protection against LEMP, etc ..

The following contents are revised in this code.

1. Chapter "Terms" is added;

2. Measures of contact voltage protection and pace voltage protection are changed;

3. The requirements for external lightning protection system adopting different metal objects are added;

4. The provisions for side stroke protection are modified;

5. The requirements for electrical system and electronic system selecting SPD are provided in detail;

6. The annual mean density calculation Formula of lightning stroke to ground is simplified, and the value of predicted lightning stroke times for judging lightning protection classification of structures is adjusted;

7. More specific requirements are made for partial Items.

The provisions printed in bold type are compulsory ones and must be enforced strictly. The Ministry of Housing and Urban-Rural Development is in charge of the administration of this code and the explanation of the compulsory provisions; China Machinery Industry Federation is responsible for routine management, and China IPPR International Engineering Corporation is responsible for the explanation of specific technical contents. All relevant organizations are kindly requested to sum up and accumulate your experiences in actual practices during the process of implementing this code.

The relevant opinions and advice on modification or supplement, whenever necessary, can be posted or passed on to China IPPR International Engineering Corporation (Address. No.5, W. 3rd Ring Rd North, Haidian District, Beijing 100089, China) for futhure reference.

Organization Units, Chief Development Organizations, Participating Development Organizations, Chief Drafting Staffs and Chief Examiners of this code.

Organization Units. China Mechanical Industrial Exploration and Design Association Chief Development Organization. China IPPR International Engineering Corporation Contents General Provisions ... 1

2 Terms ... 2

3 Classification of Structures to Be Protected Against Lightning ... 7

4 Protection Measures for Structures Against Lightning ... 9

4.1 Basic Requirement ... 9

4.2 Protection Measures for First Class of Structures to be Protected Against Lightning ... 9

4.3 Protection Measures for Second Class of Structures to Be Protected Against Lightning ... 17

5 Lightning Protection Syste1n ... 30

5.1 Materials for Lightning Protection System ...30

5.2 Air-termination System ... 31

5.3 Down-conductor System ... 34

6 Protection Against LEMP (Lightning Electromagnetic Impulse) ...38

6.1 Basic Requirement ... 38

6.2 Lightning Pretection Zones and Protection Against LEMP ... 38