QX/T 105-2018 in English
VALIDSpecifications for acceptance of construction quality of lightning protection system
- Issued on:2018-12-12
- Implemented on:2019-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$398.00
Introduction
Core Changes of the Specification Revision
| Change Type | 2009 Edition | 2018 Edition |
|---|---|---|
| Standard Name | Specification for Construction Quality Supervision and Acceptance of Lightning Protection Devices | Specification for Construction Quality Acceptance of Lightning Protection Devices |
| Chapter Structure | 19 Chapters + 6 Appendices | 11 Chapters + 2 Appendices |
| New Content | - | Shielding Construction Acceptance Requirements (Chapter 9) |
| Key locations | Scattered in various chapters | Integrated into normative Appendix B |
Analysis of key acceptance indicators
1. Grounding device requirements
The spacing between artificial grounding electrodes should be maintained at 5m, the burial depth should be >0.5m, and the distance from the building foundation should be ≥1m.
- Flat steel-flat steel: ≥2 times the width
- Round steel-round steel: ≥6 times the diameter
2. Downconductor Installation
| Laying method | Fixed spacing | Bending radius |
|---|---|---|
| Exposed horizontal conductor | 500mm (flat steel) 1000mm (round steel) | ≥10 times the diameter/6 times the width |
| Vertical conductor | Uniform 1000mm | |
Key points for acceptance in special locations
1.
Special attention should be paid to gas stations:
- Storage tank flange transition resistance ≤ 0.03Ω
- SPD installation location should avoid explosion-proof areas
- Metal pipes need to be jumpered every 30m
2. Petrochemical plants
Floating roof tank requirements:
- Connecting wire cross-sectional area ≥ 50mm²
- Connection point spacing ≤ 18m
- Drainage pipes need to be jumpered separately
Key parameters for SPD installation
| Equipment type | Impact voltage (kV) | Connection line length limit |
|---|---|---|
| Class I (electronic equipment) | 1.5 | ≤0.5m (or Kevin wiring) |
| Class III (distribution equipment) | 4 | |
| Voltage-limiting SPD spacing | ≥5m | |
Implementation suggestions
- Concealed projects must retain weld photos and ground resistance test records
- Key locations should undergo special testing of transition resistance
- SPDs must undergo Up/f value verification after installation
- Concealed lightning conductors should be used as a priority for lightning protection in historic buildings
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