Conductors in the past were normally measured by the number and diameter of individual strands, cross-sectional area or both. The new system for measuring flexible conductors (column 3 & 4 in table) now centres on the core resistance and the maximum strand diameter. Cables now can have a smaller diameter and fewer strands than in the table below but will still conform to the standards BS EN 60228, VDE 0295 and IEC 228 by having the correct conductor resistance.

Download Examples of metric conductor make up