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- Complete technical specification tables for hard-drawn copper and annealed copper with resistance and tensile strength parameters
- 5 core technical requirements for materials, dimensions, electrical properties, and mechanical properties according to official regulations
Ngoc Lan Cable with professional electrical wire and cable manufacturing experience has successfully applied this standard in their electrical wire and cable production processes.
1. Introduction to TCVN 5933
TCVN 5933 was issued by the Ministry of Science & Technology of Vietnam to regulate 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.
Since the electrical industry developed rapidly from the 1990s, Vietnam needed its own national standard to control the quality of copper wires. Therefore, TCVN 5933 was established to ensure that domestic copper products meet stringent technical requirements.
The standard provides detailed regulations on materials, mechanical and physical properties, and dimensions. With high technical requirements, cable and wire manufacturers must strictly comply to ensure electrical system safety.
2. Quick reference table for TCVN 5933
Summary information for TCVN 5933 standard
| Full name: | TCVN 5933:1995 – Standard regulating round copper wires for electrical engineering applications |
| Scope of application: | Hard-drawn copper wires and annealed copper wires |
| Specified diameter rangeh: | 0.02mm to 9.42mm |
| Issue date: | 1995 |
| Current status: | Still 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 download the official PDF file at the end of this article.
3. Technical specification reference tables
Hard-drawn copper specification tables according to TCVN 5933 regulate technical values for each standard copper wire diameter. Since 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 | Over200–290 (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 assessment 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 Tolerance – Strictly controlled according to each specification
The core difference between hard-drawn copper and annealed copper comparison lies in the heat treatment process. Since annealed copper undergoes annealing heat treatment, it has higher ductility. To select the correct copper type, engineers need to consider bending and installation requirements.
Ngoc Lan Cable manufactures complete diameter specifications from 0.02 mm to 9.42 mm according to TCVN 5933 standard, meeting all project needs from civil to industrial applications.
4. Technical requirements of standard 5933
TCVN 5933 establishes 5 groups of stringent technical requirements to ensure copper wire quality. Since electrical applications demand high reliability, each requirement is specified in detail. To meet standards, manufacturers must strictly control each parameter.
4.1 Materials
Material requirements
Use pure copper ≥99.9%, strictly control impurities to ensure electrical conductivity.
- Purity
- ≥99.9% Cu
- Oxygen Content
- ≤0.04%
- Impurities
- Limited Pb, Ni, Fe, Zn
Requires certified composition analysis.
4.2 Kích thước
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 measurements at 20°C to evaluate electrical 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
Periodically test tensile strength and elongation.
- 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 and clean, with no defects affecting insulation.
- No cracks, no deep grooves
- No thick oxide layer
- Roughness suitable for application
5. Applications & Ngoc Lan Cable products
Copper wires meeting TCVN 5933 standard have widespread applications in many electrical engineering sectors. Since copper has superior electrical conductivity and good heat resistance, it is used as conductors for most types of electrical wires and cables.
At Ngoc Lan Cable, annealed round copper wires (diameter 1.0 – 3.0mm) with high flexibility are applied in manufacturing various types of electrical wires and cables such as CVV, CV, CXV, CXV/DSTA, service entrance cables and others.
6. FAQ – Frequently asked questions about TCVN 5933 standard
6.1. Is TCVN 5933:1995 still valid and applicable?
Yes, TCVN 5933:1995 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) or download directly from the section below.
7. Download TCVN 5933 documents and product catalogue
Referencing official technical documentation is an important step to fully understand the standard requirements. For convenience in design and inspection work, you need comprehensive reference materials.
Download official TCVN 5933 PDF file
Complete standard document with technical regulations, testing methods and detailed specification tables.
View Ngoc Lan Cable product catalogue
See detailed products that apply TCVN 5933 standard.
8. Guidelines for applying TCVN 5933 in professional electrical projects
TCVN 5933 standard has established its important position in Vietnam's electrical wire and cable industry with stringent technical regulations for round copper wires for electrical engineering.
Core values that this article provides:
- Understanding technical requirements – 5 groups of quality criteria from materials to electrical and mechanical properties
- Quick specification reference – Standard diameter and resistivity tables for hard-drawn copper and annealed copper
- Comparison with international standards – Understanding TCVN 5933's position in the global context
The selection of copper wires meeting TCVN 5933 standard directly affects the quality of electrical systems, so engineers and contractors need to pay special attention.
Ngoc Lan Cable provides and shares technical information with evidence from official standards, supporting the engineering community in reference and application.
