Table of Contents - L.1203 (07/2026) - Colour and marking identification of up to 400 VDC power distribution for information and communication technology systems

1	Scope
2	Reference
3	Definitions
	3.1	Terms defined elsewhere
	3.2	Terms defined in this Recommendation
4	Abbreviations and Acronyms
5	Conventions
6	Electrical distribution identification coverage
7	Identification principle
	7.1	General rules
	7.2	Colour and marking of up to 400 VDC conductor wires and cables for A3 or P interface
	7.3	Additional recommendation for other DC voltage distribution cabling excluding up to 400 VDC interface A3 or P
8	DC distribution devices additional colour and marking
	8.1	General requirements
	8.2	DC outputs from DC power systems with protective devices
	8.3	DC sub-distribution boards (with protective devices)
	8.4	DC power plugs strips inside ICT equipment rooms and cabinets
9	Durability of marking and reading errors limitation
Appendix I – Review of Standards or common use of colour and marking of distribution cabling in AC and DC in buildings and equipment
	I.1	Recommended colours for wires in [IEC 60757] and [IEC 60445]
	I.2	Other norms or specifications
	I.3	Building distribution cable colour and marking standards
Bibliography