GB/T 31841-2015 in English
VALIDMechanical structures for electrotechnical and electronic equipment―Design guide for electromagnetic shielding and ESD protection
- Issued on:2015-07-03
- Implemented on:2016-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$359.00
《GB/T 31841-2015电工电子设备机械结构 电磁屏蔽和静电放电防护设计指南》由TC34（全国电工电子设备结构综合标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准规定了电工电子设备机械结构电磁屏蔽和静电放电防护的术语和定义、对机械结构的电磁兼容性要求、电磁屏蔽设计指南和静电放电防护设计指南。
本标准适用于电工电子设备机械结构。
Introduction
Core content interpretation
Key elements of electromagnetic shielding design
| Design elements | Technical requirements | Typical implementation methods |
|---|---|---|
| Material selection | Conductivity ≥1.72×10-3Ω·mm | Copper plate (thickness ≥0.067mm), conductive coated plastic |
| Gap control | Gap length <λ/20 | Finger-shaped spring, conductive gasket (compression ratio 30%) |
| Hole treatment | Aperture＜3.2mm | Waveguide ventilation window (depth 12.7mm) |
Key points of electrostatic discharge protection technology
Equipotential design case:The metal door of the cabinet is continuously grounded through beryllium copper finger-shaped spring, and the contact resistance is <10mΩ.
Typical parameters:When 8kV electrostatic discharge, the air gap is ≥4mm and the creepage distance is ≥6mm.
Analysis of Standard Evolution
This standard integrates electromagnetic shielding and ESD protection for the first time. Compared with GB/T 18663.3-2007, it adds the following:
- Shielding requirements for frequency bands above 3GHz (80dB@6GHz)
- Application guide for composite conductive fillers
- Dynamic connection ESD protection scheme
Implementation suggestions
- Prioritize the use of nickel-plated conductive rubber gaskets (shielding effectiveness 115dB@1GHz)
- Control the electrochemical potential difference ≤0.5V (see Appendix A metal combination table)
- Use double-layer honeycomb ventilation panels (shielding effectiveness 110dB@10MHz) in key areas
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