GB/T 24275-2019 in English
VALIDLow-voltage fixed connection enclosed switchgear and controlgear assemblies
- Issued on:2019-10-18
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$534.00
《GB/T 24275-2019低压固定封闭式成套开关设备和控制设备》由TC266（全国低压成套开关设备和控制设备标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Analysis of core changes in the standard
| 2009 version clauses | 2019 version changes | Technical impact |
|---|---|---|
| Overvoltage categories | Deleted | Simplified equipment classification system |
| Electrical clearance requirements | Added minimum clearance of 1.5mm below 2.5kV | Strengthening low voltage equipment safety |
| Protection level verification | Added IPXXB requirements for baffles | Improved maintenance safety |
Key structural requirements
6.5 Electrical clearance regulations: The minimum clearance is 1.5mm when the rated impulse voltage is ≤2.5kV, and the creepage distance of material group I is 4.0mm at 320V insulation voltage. The insulation material must pass the glow wire test (GB/T5169.5) to verify the fire tolerance.
The number of mechanical operation tests for cabinet-type complete sets of equipment is increased from 50 times to 200 times, and the hinges must withstand a load of 4 times the door weight (≥10kg).
EMC Test Matrix
| Test Items | Class A Environment | Class B Environment |
|---|---|---|
| Electrostatic Discharge | ±8kV Air Discharge | ±4kV Contact Discharge |
| Radio Frequency Radiation | 10V/m(80MHz-2GHz) | 3V/m Equivalent Frequency Band |
Implementation Suggestions
1. When selecting insulated hybrid enclosure, it is necessary to verify that the material CTI≥400 (Group II)
2. For the main circuit power frequency withstand voltage test, it is recommended to use 2830V DC instead of 2000V AC
3. Protection conductor continuity test current ≥ 10A, resistance limit 0.1Ω
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