GB/T 4776-2017 in English
VALIDElectrical safety terminology
- Issued on:2017-07-31
- Implemented on:2018-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$447.00
| Standard No: | GB/T 4776-2017 |
| Document status: | VALID |
| Title in English: | Electrical safety terminology |
| Title in Chinese: | 电气安全术语 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2017-07-31 |
| Implemented on: | 2018-02-01 |
| Superseding: |
GB/T 4776-2008 Electrical safety terminology
|
| Chinese Classification: | K04-Basic standards and general methods |
| Professional Classification: | GB-National Standard |
| Related Keywords: | electrical safety terminology introduction background
electrical safety basic terminology standard core safety key safety measures |
| Related Topics: | Electrical Safety
Electrical Safety Card GB/T4776-2008 Kitchen electrical safety security terms "Electrical Safety Glossary". GB/T 4776 GBT4776 GB/T 4776-1984 GB/T 4776-2008 GB/T 4776-2017 Electrical Safety Terms GB/T4776-2017 gb/t4776 gbt4776 gb/t 4776-2017 t4776-2017 gb 4776-2017 gbt4776-2017 |
《GB/T 4776-2017电气安全术语》由TC25（全国电气安全标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Background of Standard Revision and Technological Evolution
GB/T 4776-2017, as the basic terminology standard in the field of electrical safety, replaced the 2008 version and achieved three major technological breakthroughs:
| Dimensions | 2008 version | 2017 version |
|---|---|---|
| Total number of terms | 142 items | 129 items |
| New terms | - | 10 items such as electric shock protection |
| Deleted terms | - | 23 items such as protection relay |
Analysis of core safety concepts
2.1.3 Electric shock
Define the physiological effect caused by electric current passing through a living organism. The degree of danger depends on:
- Current threshold: sensing current (0.5-1mA) → getting rid of current (10-16mA) → ventricular fibrillation (50mA)
- Duration: exceeding the heart cycle (about 1s) will significantly increase the risk
2.1.38 Protection level (IP code)
Adopt the IPXX identification system:
| Code position | Protection object | Typical level |
|---|---|---|
| First position | Solid foreign matter | Level 6 (completely dustproof) |
| Second position | Liquid intrusion | Level 8 (continuous submersion) |
Comparison of key safety measures
2.3.1 Classification of protection systems
| System type | Grounding characteristics | Typical applications |
|---|---|---|
| TN system | Equipment housing connected to neutral line | Civil power distribution system |
| TT system | Independent grounding device | Rural power grid |
| IT system | Ungrounded neutral point | Special places such as mines |
2.3.3.1 Classification of equipment for protection against electric shock
- Class 0 equipment: Only basic insulation, no grounding measures (gradually eliminated)
- Class II equipment: Double insulation/reinforced insulation, no need for grounding
Recommendations for the implementation of the standard
- Term application: Technical documents must strictly adopt the terms defined in this standard. For example, "electric shock protection" must not be written as "protection against electric shock"
- Equipment selection: Prioritize Class II or Class III equipment
- Training focus: Strengthen the teaching of easily confused concepts such as "indirect contact (2.1.17)"
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