GB/T 26802.2-2017 in English
VALIDIndustrial control computer system―General specification―Part 2:Safety requirements for industrial control computer
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 26802.2-2017工业控制计算机系统 通用规范 第2部分：工业控制计算机的安全要求》由TC124（全国工业过程测量控制和自动化标准化技术委员会）归口，TC124SC2（全国工业过程测量控制和自动化标准化技术委员会控制仪表及装置、工业控制计算机系统分会）执行，主管部门为中国机械工业联合会。
Introduction
Core safety requirements of the standard
This standard specifies the mandatory requirements for industrial control computers in key safety areas such as protection against electric shock, mechanical protection, and fire spread. The safety of the equipment is ensured through dual verification of structural design and type testing.
Key indicators of electrical safety
| Test conditions | Voltage limit | Current limit | Capacitance limit |
|---|---|---|---|
| Normal conditions | 33VAC/70VDC | 0.5mA(AC) | 45μC |
| Single fault | 55VAC/140VDC | 3.5mA(AC) | See Figure 2 |
Note: The duration of transient voltage must meet the requirements of the curve in Figure 1.
Mechanical protection and fire protection design
The shell needs to pass:
- 30N static force test (8.2.1)
- 5J steel ball impact test (Figure 4)
The fire protection structure needs to meet the following requirements:
- The bottom opening meets the size restrictions in Table 9
- Non-metallic materials need to pass V-1 level combustion test
- Energy limited circuit design (9.4)
Standard implementation recommendations
Precautions in the design stage
| Double insulation | Electrical clearance ≥ basic insulation value × 2 |
| Pollution level | Select protective measures according to Table E.1 |
| Marking durability | Need to pass 70% isopropyl alcohol wipe test |
Test process optimization
It is recommended to perform the test sequence according to 4.2:
1. Reference condition test (4.3) → 2. Single fault test (4.4) → 3. Routine test (Appendix A)
Technology evolution analysis
Main enhancements compared with the previous version of the standard:
- Added quantitative requirements for energy-limited circuits (Tables 10-11)
- Cleared the corresponding relationship between pollution level and material group (6.7.2)
- Supplemented pulse withstand voltage test (11.9)
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