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National Standard Wire Diameter Chart and Calculation Method
National Standard Wire Diameter Chart
| Wire (mm²) | Conductor Diameter (mm) |
| 1.5 | 1.38 |
| 2.5 | 1.78 |
| 4 | 2.25 |
| 6 | 2.76 |
| 10 | 1.33×7 |
| 16 | 1.70×7 |
| 25 | 2.10×7 |
| 35 | 2.50×7 |
| 50 | 1.78×19 |
| 70 | 2.10×19 |
| 95 | 2.50×19 |
Note: The conductor diameters mentioned above refer to BV (PVC-insulated copper wire) and BLV (PVC-insulated aluminum wire).
Conversion Methods:
1. Calculating Wire Radius from Cross-Sectional Area:To calculate the wire radius based on its cross-sectional area, use the formula for the area of a circle:Wire Cross-Sectional Area (mm²) = π (3.14) × Wire Radius² (mm²)
2. Calculating Wire Diameter from Cross-Sectional Area:The same principle applies when calculating the wire diameter. For example, for a 2.5 mm² wire:2.5 ÷ 3.14 = 0.8. Taking the square root gives 0.9 mm.Therefore, the wire diameter is: 2 × 0.9 mm = 1.8 mm.
3. Calculating Cross-Sectional Area from Wire Diameter:To calculate the cross-sectional area based on the wire diameter, use the area of a circle formula:
Wire Cross-Sectional Area = π (3.14) × Wire Diameter² / 4
4. Calculating Stranded Cable Cross-Sectional Area:Cable sizes are also denoted by their cross-sectional area in square millimeters. For stranded wires, the total area is the sum of the cross-sectional areas of all individual strands. The calculation formula is:0.7854 × Wire Radius² (mm²) × Number of Strands
For example, for a 1.5 mm² wire with 48 strands (each strand having a radius of 0.2 mm):0.7854 × (0.2 × 0.2) × 48 ≈ 1.5 mm².
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