TS EN 62491

TS EN 62491 addresses the labelling of cables and cores/conductors used in industrial installations, equipment and industrial products. It provides a rules-and-guidance framework intended to keep the link clear between technical documentation and the physical equipment on site.

In general technical practice, cable and conductor labelling supports installation, commissioning, maintenance and fault finding by making the right item easy to identify. Cables and cores operate at different identification levels: a cable is the complete transmission assembly, often containing one or more conductors and associated protection, while a core or conductor is an individual current-carrying path within that cable. Keeping those concepts distinct is essential for consistency between drawings, labels and the installed system.

Why documentation and physical marking need to stay aligned

The standard’s focus is not merely on marking an object, but on ensuring that the marking carries the same reference as the engineering documentation. This reduces ambiguity during design, installation and operation, and helps organize cable routes, connection points and conductor identities in complex industrial systems where many cables and signal cores are present.

As an IEC 62491-based TSE standard, it supports a common terminology and identification logic for cable and core labelling. That makes it easier to relate manufacturer documentation, system diagrams and field markings in a consistent and traceable way.