1 Subject Content and Application Scope
1.1 This standard specifies the place, principle, requirements and methods etc for the placement of fire safety signs.
1.2 This standard is applicable to places where fire safety signs are used to show fire safety information.
2 Normative Standards
GB 13495 "Fire Safety signs"
GB J16 "Code of Design on Building Fire Protection and Prevention"
GB J45 "Specifications for the Design of Highrise Civil Buildings (Trial)-Fire Prevention"
3 Terms
3.1 Viewing distance
Distance from observer's eyes to sign center point.
In this standard, viewing distance is expressed by letter D, as shown in Figure 1.
3.2 Viewing angle
The included angle of connecting line connecting observer's eyes and sign center point to the sign located plane.
In this standard, viewing angle is expressed by letter α, as shown in Figure 1.
3.3 Displacement
The distance from sign center point to the visual axis when looking squarely at the sign located plane.
In this standard, displacement is expressed by letter X, as shown in Figure 1.
3.4 Angle of displacement
The included angle of the line connecting sign center point and eyes to the visual axis when looking squarely at the sign located plane. In this standard, angle of displacement is expressed by letter θ, as shown in Figure 1.
