Before the adoption of this standard, European countries utilized varied and often conflicting color codes for electrical conductors. This fragmentation posed significant safety risks, particularly in the industrial and construction sectors where personnel might encounter unfamiliar wiring schemes. In January 2003, the German standard was published, aligning with the European harmonization document HD 308 S2 . While it became valid in 2003, a transitional period allowed the use of old codes until April 1, 2006. Key Standard Requirements
The identification of wires depends on the number of cores and the presence of a protective ground (green-yellow): 3 Cores : Green-Yellow, Blue (Neutral), Brown (Phase). 4 Cores : Green-Yellow, Brown, Black, Grey. 5 Cores : Green-Yellow, Blue, Brown, Black, Grey. Without Green-Yellow Ground (-O cables): 2 Cores : Blue, Brown. 3 Cores : Brown, Black, Grey. 4 Cores : Blue, Brown, Black, Grey. VDE 0293 308 DIN VDE 0293 308 2003 01 pdf
The most significant change introduced by the 2003-01 version was the inclusion of the color as a phase conductor. This addition allowed for a clearer distinction in multicore cables, particularly for three-phase systems. The standard applies to both fixed installations (like building wiring) and flexible cords (for portable equipment). Core Identification Schemes Before the adoption of this standard, European countries