IEC 60757-2021 pdf Code for designation of colours

2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60445, Basic and safety principles for man-machine interface, marking and identification – Identification of equipment terminals, conductor terminations and conductors 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • • IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 4 Letter codes for colours For the designation of a colour, the following applies: for colours listed in Table 1, the designation shall be in accordance with the letter code specified in Table 1; for other colours, the letter code applied shall be specified in supporting documentation.
5 Application of colour designations Multiple colours on the same item 5.1 Where an item is coloured with different colours, the colour designation for that item shall be formed by adding the colour codes for the different colours applied in a sequence as they are listed from the top in Table 1. EXAMPLE An item coloured red and blue is colour designated: RDBU. The combination of the colours green, GN, and yellow, YE, shall be restricted to those purposes specified in IEC 60445, and those colours shall not be used in any combination other than the combination green-and-yellow, GNYE. 5.2 Alternating colours of the same item Where different colours are used alternatively for the same item, the colour designation for that item shall be formed by adding the colour codes for the different alternating colours applied in a sequence as they are listed from the top in Table 1, separated by the SOLIDUS sign “/”. EXAMPLE An LED alternating between the two colours blue and white is colour designated BU/WH. 5.3 Colours on different subitems of an item Where different subitems of an item are coloured with different colours or colour combinations, the colour designation for the content of the item shall be formed by adding the colour designation of the different subitems separated by the PLUS sign “+”. EXAMPLE A cable with a black, a brown, a grey, a blue, and a green-and-yellow core is colour designated: BK+BN+GNYE+BU+GY