16 – 25 – 35 – 50 – 70 – 95 – 120 – 150 – 185 – 240 – 300 – 400
0.5 – 0.75 – 1 – 1.5 – 2.5 – 4 – 6 – 10 bs en/iec 60228
| Nominal area (mm²) | Max. resistance (Ω/km) at 20°C | |--------------------|-------------------------------| | 1.5 | 12.1 | | 2.5 | 7.41 | | 4 | 4.61 | | 6 | 3.08 | | 10 | 1.83 | | 16 | 1.15 | | 25 | 0.727 | | 35 | 0.524 | | 50 | 0.387 | | 70 | 0.268 | | 95 | 0.193 | | 120 | 0.153 | | 150 | 0.124 | | 185 | 0.0991 | | 240 | 0.0754 | 16 – 25 – 35 – 50 –
Here is an extract for (Class 2, the most common for fixed power cables): The Most Important Table: Maximum Resistance The true
500 – 630 – 800 – 1000 – 1200 – 1600 – 2000 – 2500 You will never see a 30 mm² or 80 mm² conductor in a compliant cable. Stick to the list. The Most Important Table: Maximum Resistance The true heart of the standard is the maximum DC resistance at 20°C. This prevents manufacturers from using cheap, impure copper or undersized strands.
In this article, we’ll break down what the standard covers, why it matters, and how to use it correctly. BS EN/IEC 60228 is the British Standard (BS) adoption of the international standard IEC 60228 , titled "Conductors of insulated cables."
If you have ever specified a cable, terminated a wire, or calculated voltage drop, you have relied on BS EN/IEC 60228 – even if you didn’t know it. This standard is the international foundation for classifying conductors by their cross-sectional area and resistance.