Grounding device construction and acceptance specification GB50169-92

Construction and Acceptance Specification for Grounding Devices

GB 50169-92

Introduction

This specification, in compliance with GB 50169-92, is set up with reference to the Code for Lightning Protection of Buildings (GBJ 135-2006). The specification has been devised by the Ministry of Construction and other departments concerned and is applicable to the construction of lightning protection grounding devices and their acceptance inspection. The present specification is applicable to buildings and other projects in which the lightning protection grounding devices are required according to the Lightning Protection Code (GBJ 135-2006).

1 General

1.1 This specification applies to the construction and acceptance inspection of lightning protection grounding devices which are required according to the Lightning Protection Code (GBJ 135-2006).

1.2 This specification involves the construction of buried cables and plates and their connection assembly, inspection and acceptance, as well as the testing.

1.3 The construction of other ground-to-ground connection devices (also known as grounding distribution devices) shall conform to the corresponding national standards.

2 Grounding Device Selection Principles

2.1 The grounding device selection shall be based on the design purpose, construction static conditions, soil conductivity and other factors, proper grounding methods shall be determined accordingly.

2.2 The main grounding device shall be a buried cable or a buried plate, and it shall be connected to the main body of the lightning protection grounding device, and other subsidiary grounding devices shall also be connected on the basis of certain requirements.

2.3 The grounding device shall be able to conduct lightning current effectively and continuously and disperse current across the device.

2.4 The grounding device shall be designed with a large enough size to drain the current it receives, and to prevent the grounding resistance from rising when lightning current passes through it.

3 Construction Principles

3.1 The layouts and materials of the grounding devices shall conform to the corresponding design drawings and requirements.

3.2 No soil shall remain in the pit after the construction of the grounding ground pits and the installation of the grounding devices.

3.3 The ground pits in rocky soil shall be backfilled with the same rock materials for the purpose of compaction.

4 Acceptance Inspection

4.1 Visual inspection

4.1.1 The visual inspection shall be conducted to ensure that the grounding device layout and installation comply with the requirements of the design drawings and specifications.

4.1.2 The visual inspection shall also be conducted for the electrical connection of the grounding device, to ensure that the connection is firm and reliable.

4.2 Resistance Test

4.2.1 The resistance of the grounding device shall be measured by using a high voltage tester in conformity with the requirements of GBJ 135-2006.

4.2.2 The resistance should be measured repeatedly until the measured results converge.

4.2.3 The resistance of the grounding device should be controlled within the range stated by the Lightning Protection Code.

Conclusion

This specification provides requirements and procedures for the construction and acceptance inspection of lightning protection grounding devices. It is applicable to buildings and other projects in which grounding devices are required according to the Lightning Protection Code GBJ 135-2006. It sets out the selection principles for grounding devices, the construction principles, and the visual inspection and the resistance test that should be conducted for the acceptance inspection.

Introduction

The GB50169-92 construction and acceptance specification for grounding is an industry standard set by the National Technical Supervision Bureau to guide project acceptance and engineering quality supervision and evaluation in the engineering of grounding equipment.

Contents

The GB50169-92 construction and acceptance specification for grounding mainly covers the design of the grounding equipment and the materials, accessories, construction requirements and test acceptance of the grounding equipment. The contents include:

1) Design requirements of grounding equipment;

2) Materials, accessories, construction requirements and acceptance test tests of grounding equipment;

3) The clearance scale, basic design and burial of grounding bodies and the requirements of protective sleeves;

4) The inspection and acceptance requirements for the construction of lightning protection grounding and ground grid;

5) Ground resistance test, voltage drop test and other ground test methods for grounding devices.

Conclusion

The GB50169-92 construction and acceptance specification for grounding provides a set of uniform standards for the design, construction and acceptance of grounding devices, laying a solid foundation for the quality acceptance of grounding engineering.