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This standard plays an important role in ensuring the quality of electrical products in Vietnam. In this article, you can refer to all technical aspects of the TCVN 5933 standard in detail and easy-to-understand manner:
- Complete technical specification reference tables for hard drawn copper and annealed copper with parameters including resistance and tensile strength
- 5 core technical requirements regarding materials, dimensions, electrical properties and mechanical properties according to official regulations
Ngoc Lan Cable with professional experience in power cable manufacturing has successfully applied this standard in the power cable production process.
1. Introduction to TCVN 5933
TCVN 5933 was issued by the Ministry of Science & Technology of Vietnam to specify technical requirements for round copper wires for electrical engineering. This standard applies to both hard drawn copper and annealed copper used in industrial and civil electrical applications.
As the electrical industry developed strongly from the 1990s, Vietnam needed its own national standard to control the quality of copper wires. Therefore, TCVN 5933 was created to ensure that domestic copper products meet stringent technical requirements.
The standard specifies details about materials, physical properties and dimensions. With high technical requirements, power cable manufacturers must strictly comply to ensure electrical system safety.
2. TCVN 5933 Quick Reference Table
Summary information of TCVN 5933 standard
| Full name: | TCVN 5933 – Standard specifying round copper wires used in electrical engineering |
| Scope of application: | Hard drawn copper wire and annealed copper wire |
| Specified diameter: | 0.02mm to 9.42mm |
| Issue date: | 1995 |
| Current status: | In effect |
| Issuing authority: | Ministry of Science & Technology of Vietnam |
Given the importance of this standard in the electrical industry, mastering the technical regulations is mandatory for all engineers and contractors. For more detailed reference, you can view the official file at the end of this article.
3. Technical Specification Reference Tables
The hard drawn copper specification table according to TCVN 5933 specifies technical values for each standard copper wire diameter. Because hard drawn copper has a stable crystal structure, it has high tensile strength but low ductility.
Table 1: Annealed copper technical specifications
| Nominal diameter (mm) |
Tensile strength MPa (kG/mm²) (≥) |
Relative elongation % (≥) |
|---|---|---|
| 0.02 and 0.025 | over 200–290 (20–29) | 6 |
| Over 0.025 to 0.05 | over 200–290 (20–29) | 10 |
| 0.06 and 0.063 | over 200–290 (20–29) | 12 |
| 0.071 | over 200–290 (20–29) | 13 |
| 0.080 | over 200–290 (20–29) | 14 |
| 0.090 | over 200–290 (20–29) | 15 |
| 0.100 | over 200–290 (20–29) | 16 |
| Over 0.100 to 0.120 | over 200–280 (20–28) | 17 |
| Over 0.120 to 0.150 | over 200–280 (20–28) | 18 |
| Over 0.150 to 0.190 | over 200–280 (20–28) | 19 |
| Over 0.190 to 0.580 | over 200–280 (20–28) | 20 |
| Over 0.580 to 0.970 | over 200–280 (20–28) | 25 |
| Over 1.00 | over 200–280 (20–28) | 30 |
| Over 1.00 to 1.95 | over 200–280 (20–28) | 30 |
| Over 1.95 to 3.00 | over 200–280 (20–28) | 30 |
| Over 3.00 to 5.00 | over 200–270 (20–27) | 30 |
| Over 5.00 to 9.42 | over 200–260 (20–26) | 35 |
Table 2: Hard drawn copper technical specifications
| Nominal diameter (mm) |
Tensile strength MPa (kG/mm²)(≥) |
Relative elongation %(≥) |
|---|---|---|
| 0.02 and 0.025 | 450 (45) | − |
| Over 0.025 to 0.05 | 450 (45) | − |
| 0.06 and 0.063 | 450 (45) | − |
| 0.071 | 450 (42) | − |
| 0.080 | 450 (42) | − |
| 0.090 | 450 (42) | − |
| 0.100 | 450 (42) | − |
| Over 0.100 to 0.120 | 400 (40) | 0.5 |
| Over 0.120 to 0.150 | 400 (40) | 0.5 |
| Over 0.150 to 0.190 | 400 (40) | 0.5 |
| Over 0.190 to 0.580 | 400 (40) | 0.6 |
| Over 0.580 to 0.970 | 400 (40) | 0.6 |
| Over 1.00 | 400 (40) | 0.6 |
| Over 1.00 to 1.95 | 400 (40) | 1.6 |
| Over 1.95 to 3.00 | 400 (40) | 1.6 |
| Over 3.00 to 5.00 | 380 (38) | 1.5 |
| Over 5.00 to 9.42 | 360 (36) | 2.0 |
Important quality evaluation criteria:
- Resistivity – Must achieve maximum 0.017241 Ω.mm²/m at 20°C
- Tensile strength – Hard drawn copper minimum 360 Kg/mm²
- Elongation – Annealed copper minimum 6% depending on diameter
- Dimensional deviation – Strictly controlled according to each specification
The core difference in comparison between hard drawn copper and annealed copper lies in the heat treatment process. Because annealed copper undergoes an annealing heat treatment process, it has higher ductility. To select the right type of copper, engineers need to consider bending and installation requirements.
Ngoc Lan Cable manufactures a full range of diameter specifications from 0.02 mm to 9.42 mm according to TCVN 5933 standard, meeting all project needs from civil to industrial.
4. Core technical requirements of standard 5933
TCVN 5933 establishes 5 groups of stringent technical requirements to ensure copper wire quality. Because electrical applications require high reliability, each requirement is specified in detail. To meet standards, manufacturers must strictly control each parameter.
4.1 Material
Material requirements
Use pure copper ≥99.9%, strictly control impurities to ensure conductivity.
- Purity
- ≥99.9% Cu
- Oxygen content
- ≤0.04%
- Impurities
- Limits on Pb, Ni, Fe, Zn
Composition analysis certification required.
4.2 Dimensions
Dimensional requirements
Control diameter deviation as it affects resistance and current carrying capacity.
- Ø 1.0–2.0mm → ±0.02–0.03mm
- Ø 2.5–4.0mm → ±0.03–0.04mm
- Ø 6.0–10.0mm → ±0.05–0.06mm
Ensure roundness, measure at multiple points.
4.3 Electrical properties
Electrical property requirements
Standardize measurement at 20°C to evaluate conductivity.
- Resistivity
- ≤0.017241 Ω·mm²/m
- Temperature coefficient
- 0.00393/°C
- Electrical conductivity
- ≥57.0 MS/m
4.4 Mechanical properties
Mechanical property requirements
Test tensile strength and elongation periodically.
- Hard drawn copper
- ≥360-450 kg/mm²; elongation 0.5–2%
- Annealed copper
- 200–280 kg/mm²; elongation 20–35%
4.5 Surface
Surface requirements
Surface must be smooth, clean, without defects affecting insulation.
- No cracks, no deep grooves
- No thick oxide layer
- Appropriate roughness for application
5. Application of the standard in the electrical industry and Ngoc Lan Cable products
Copper wires meeting TCVN 5933 standard have wide applications in many electrical engineering industries. Because copper has superior electrical conductivity and good heat resistance, it is used as a conductor for most types of power cables.
At Ngoc Lan Cable, annealed round copper wires (diameter 1.0 – 3.0mm) with high flexibility are applied in manufacturing various types of wires and power cables such as CVV-0.6/1kV power cable, CV – class 2 copper conductor cable, CXV-0.6/1kV, CXV/DSTA-0.6/1kV, service entrance cables…
6. FAQ – Frequently asked questions about TCVN 5933 standard
6.1. Is TCVN 5933 still valid and applicable?
Yes, TCVN 5933 remains fully valid and is recognized by Vietnamese state management agencies. All domestic electrical wire and cable manufacturers must apply this standard to ensure compliance.
6.2. What are the main differences between hard-drawn copper and annealed copper in TCVN 5933?
Hard-drawn copper has high tensile strength (≥360 kg/mm²) but low elongation (0.5-2%), suitable for fixed applications. Annealed copper has high elongation (20-35%) but lower tensile strength (200-280 kg/mm²), suitable for conductors requiring high flexibility.
6.3. How can I download the official PDF file of TCVN 5933 standard?
Download officially from the website tieuchuan.vsqi.gov.vn (Vietnam standards and quality institute).
7. View official TCVN 5933 documentation and product catalogue
Referring to official technical documentation is an important step to fully understand the standard's requirements. For convenience in design and testing work, you need to have complete reference documentation.
View official TCVN 5933:1995 documentation
Standard document with all technical regulations, reference tables and detailed test methods.
View Ngoc Lan Cable product catalogue
View details of products applying TCVN 5933 standard.
8. Guidelines for applying TCVN 5933 for professional electrical projects
The TCVN 5933 standard has affirmed its important position in Vietnam's wire and cable industry with stringent technical regulations for round copper wires for electrical engineering.
Core values that this article brings:
- Clear understanding of technical requirements – 5 groups of quality criteria from materials to electrical and mechanical properties
- Quick specification reference – Reference tables for diameter and standard resistivity for hard drawn copper and annealed copper
- Comparison with international standards – Understanding the position of TCVN 5933 in the global context
Selecting copper wires meeting TCVN 5933 standard directly affects the quality of electrical systems, engineers and contractors need to pay special attention. Ngoc Lan Cable provides and shares technical information with references from official standards, supporting the engineering community in reference and application.
