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Metric Cable Size and Resistance Table (IEC 60228)
Cable size chart for metric conductors with the maximum DC resistance allowed by IEC 60228 for class 2 stranded conductors.
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Conductor resistance at 20 °C
| Size mm² | Copper Ω/km | Aluminium Ω/km | Cu loop Ω per 100 m | Nearest AWG |
|---|---|---|---|---|
| 0.5 | 36.0 | 7.200 | 20 | |
| 0.75 | 24.5 | 4.900 | 18 | |
| 1 | 18.1 | 3.620 | 17 | |
| 1.5 | 12.1 | 2.420 | 15 | |
| 2.5 | 7.41 | 1.482 | 13 | |
| 4 | 4.61 | 0.922 | 11 | |
| 6 | 3.08 | 0.616 | 9 | |
| 10 | 1.83 | 3.080 | 0.366 | 7 |
| 16 | 1.15 | 1.910 | 0.230 | 5 |
| 25 | 0.727 | 1.200 | 0.145 | 3 |
| 35 | 0.524 | 0.868 | 0.105 | 2 |
| 50 | 0.387 | 0.641 | 0.0774 | 1/0 |
| 70 | 0.268 | 0.443 | 0.0536 | 2/0 |
| 95 | 0.193 | 0.320 | 0.0386 | 3/0 |
| 120 | 0.153 | 0.253 | 0.0306 | 4/0 |
| 150 | 0.124 | 0.206 | 0.0248 | > 4/0 |
| 185 | 0.0991 | 0.164 | 0.0198 | > 4/0 |
| 240 | 0.0754 | 0.125 | 0.0151 | > 4/0 |
| 300 | 0.0601 | 0.100 | 0.0120 | > 4/0 |
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About this Table
Cable size chart for metric conductors with the maximum DC resistance allowed by IEC 60228 for class 2 stranded conductors.
Basis: IEC 60228 Table 2, maximum DC resistance at 20 °C for class 2 plain copper and aluminium conductors (aluminium from 10 mm²).
How to use
- Find the conductor size.
- Multiply Ω/km by route length in km × 2 for the loop resistance.
- Correct for temperature: R rises about 0.393 % per °C for copper.
Notes
- Values are maximum limits; real cables are usually a little lower.
- Instrument loops: check the transmitter minimum voltage with the loop resistance.
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Frequently Asked Questions
What is the resistance of 1.5 mm² copper cable?
Maximum 12.1 Ω/km at 20 °C to IEC 60228.
What is the resistance of 2.5 mm² cable?
Maximum 7.41 Ω/km at 20 °C.
How do I get the loop resistance?
Multiply Ω/km by the one way length in km and by 2.
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