16 – 25 – 35 – 50 – 70 – 95 – 120 – 150 – 185 – 240 – 300 – 400
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." 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 –
Next time you pick up a cable, remember: the mm² rating is a promise. The resistance table is the proof. Need to check a specific conductor size or resistance value? Always refer to the latest official edition of BS EN/IEC 60228 (current version: 60228:2005, confirmed to BS in 2019). The resistance table is the proof
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.