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
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). 16 – 25 – 35 – 50 –
Aluminium conductors have higher resistance – roughly 1.6× the copper value. Need to check a specific conductor size or resistance value
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.
Here is an extract for (Class 2, the most common for fixed power cables):