1 Scope
This Part of GB/T 2893 establishes the colorimetric and photometric requirements and test methods for the colours of safety signs to be used in workplaces and public areas. It provides the colorimetric and photometric specifications for the named safety and contrast colours prescribed in GB/T 2893.1-2013.
The physical requirements that safety signs have to meet are primarily related to daytime colour and normally lit environments. This Part also includes the colorimetric requirements and test methods for safety signs and phosphorescent material which also operate in unlit environments.
This Part is applicable to all locations where safety issues related to people need to be addressed. However, it is not applicable to signalling used for guiding rail, road, river, maritime and air traffic and, generally speaking, to those sectors subject to a regulation that may differ.
The colorimetric and photometric properties of retroreflective safety signs, retroreflective materials combined with fluorescent or phosphorescent materials, or luminous safety signs activated by a radioactive source are not specified in this Part.
2 Normative References
The following referenced documents are indispensable for the application 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.
GB/T 2893.1-2013 Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs and safety markings (ISO 3864-1:2011, MOD)
GB/T 15565 (all parts) Graphical symbols — Terms
CIE 15 Colorimetry
CIE 69 Methods of characterizing illuminance meters and luminance meters: Performance, characteristics and specifications
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 15565 and the following apply. To be convenient for use, the following terms and definitions given in GB/T 15565.2 were specified repeatedly in this Part.
3.1
Colour region
Boundary values of x, y chromaticity coordinates of the CIE 2° standard colorimetric observer and luminance factor or luminance for the named colour.
3.2
Contrast
C
Difference in luminance factors of the graphical symbol and its background, divided by the larger luminance factor βa, where βb is the smaller luminance factor.
C =(βa - βb)/βa
3.3
Contrast colour
Colour that contrasts with the safety colour in order to make the safety colour more conspicuous.
3.4
Externally illuminated safety sign
Safety sign that is illuminated, when required, by an external source.
3.5
Internally illuminated safety sign
Safety sign that is illuminated, when required, by an internal source.
3.6
Luminance contrast
k
Luminance of the contrast colour, L1, divided by the luminance of the safety colour, L2, where L1 is greater than L2.
