IEC 60757:2021 pdf download – Code for designation of colours.
1 Scope This document specifies letter codes for designation of colours and provides rules for their combination to designate colour combinations. The letter codes are intended to be applied in the technical documentation of electrical installations, electrical equipment and products, and in markings of electrical equipment and products. This basic safety publication focusing on safety essential requirements is primarily intended for use by technical committees in the preparation of safety publications in accordance with the principles laid down in IEC Guide 1 04 and ISO/IEC Guide 51 . It is not intended for use by manufacturers or certification bodies. One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements of this basic safety publication will not apply unless specifically referred to or included in the relevant publications. This document does not specify any requirements for the encoding of colour properties, nor for their visual representation. Such requirements are under the responsibility of the different technical committees. 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.NOTE 1 Annex A shows examples of the colours together with their RGB encoding. As there is no colour matching required or implied, the colours are selected to be unambiguously different. NOTE 2 The sequence of the colours GREEN and YELLOW in Table 1 has been modified compared to that in the first edition of IEC 60757 in order to be in line with the colour code of the combination GREEN-AND-YELLOW, GNYE. However, since the colour YELLOW is the next colour in the sequence after the colour GREEN, the change of sequence has no impact for designation of combinations of the other colours listed. It is foreseen that the sequence of the colours listed in Table 1 be maintained in future editions of IEC 60757. 5 Application of colour designations 5.1 Multiple colours on the same item 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