IEC 60757 pdf – Code for designation of colours
This document specifies letter codes for designation of colours and provides rules for theircombination to designate colour combinations. The letter codes are intended to be applied inthe 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 theprinciples laid down in lEC Guide 104 and iSo/IEC Guide 51.
lt is not intended for use by manufacturers or certification bodies. One of the responsibiities ofa technical committee is, wherever applicable, to make use of basic safety publications in thepreparation of its publications.The requirements of this basic safety publication will not applyunless 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 differenttechnical committees.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.
For undated’references,the latest edition of the referenced document(including anyamendments) applies.
IEC 60445,Basic and safety principles for man-machine interface, marking and identification -ldentification of equipment terminals, conductor terminations and conductors
3Terms and definitions
No terms and definitions are listed in this document.
IsO and lEc maintain terminological databases for use in standardization at the followingaddresses:
.IEC Electropedia: available at http://www.electropedia.orgl
.IsO Online browsing platform: available at http://www.iso.orglobp
4Letter 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 codespecified 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 matchingrequired 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 thefirst edition of IEC 60757in order to be in line with the colour code of the combination GREEN-AND-YELLON,GNYE.However，since the colour YELLOW is the next colour in the sequence after the colour GREEN, the change ofsequence has no impact for designation of combinations of the other colours listed. ltis foreseen that the sequenceof the colours listed in Table 1 be maintained in future editions of lEC 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 beformed 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 purposesspecified in lEC 60445, and those colours shall not be used in any combination other than thecombination green-and-yellow,GNYE.
5.2Alternating colours of the same item
Where different colours are used alternatively for the same item, the colour designation for thatitem shall be formed by adding the colour codes for the different alternating colours applied ina sequence as they are listed from the top in Table 1, separated by the sOLIDus sign “r”.
EXAMPLE An LED altermnating between the two colours blue and white is colour designated BUWH.5.3Colours 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 colourdesignation 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