TS 3476

TS 3476 is an electrical standard dealing with the general rules for identifying conductors by colours or numerals. It focuses on insulated conductors in cables and on bare or separately insulated conductors inside equipment, establishing a common identification approach that helps make wiring clearer and less prone to confusion. The scope also indicates that busbars may be treated within this identification scheme.

Why conductor identification matters in electrical systems

In electrical installations, correctly recognising conductors is essential during assembly, maintenance and fault tracing. Colour coding and numbering help distinguish phase, neutral, control or auxiliary conductors when several conductors run together in the same circuit. In general technical practice, this is a practical way to reduce human error and support consistent marking across a system.

What this standard covers as an identification approach

• Insulated conductors in cables
• Bare conductors inside equipment
• Separately insulated conductors inside equipment
• Colour- or numeral-based identification for busbars
• General rules intended to reduce electrical identification confusion

From a general engineering perspective, colours provide quick visual separation, while numerals are especially useful in multicore cables and complex internal wiring where more detailed referencing is needed. The chosen method usually depends on system design, legibility and maintenance practice. TS 3476 provides a common framework for how this identification concept is applied.