8.4. LEVEL 3 RISK AREAS
These areas will be internally illuminated during occupancy to provide
at least a minimum activating illuminance as given in Section
6.2. and either do not benefit from substantial external light and/or
are occupied regularly during darkness and are not provided with emergency
lighting according to current National and International Standards
in some principal areas along or adjoining the escape paths.
9. DESIGN OF EMERGENCY WAYFINDING GUIDANCE SYSTEMS CORRESPONDING TO THE RISK AREA.
9.1. GENERAL
The basic design principle for photoluminescent emergency wayfinding
guidance systems is to adapt the quantity and/or the luminance properties
of the photoluminescent material and products to the risk level within
the premises. Systems are evolved through the system designed for Level
1 risk areas, as defined in 8.2. and described
in 9.2., through to Level 3 risk areas, as defined in 8.4. and described
in 9.4. Level 2 systems should contain all the
provisions for Level 1 systems, supplemented with the provisions described
in 9.3. Level 3 systems should contain all the
provisions of both Level 2 and 3, supplemented with the provisions described
in 9.4.
9.2. LEVEL 1. INSTALLATION OF EMERGENCY AND ESCAPE PATH DIRECTIONAL SIGNS, SAFETY SIGNING AND FLOOR PROXIMITY LOW LOCATION LIGHTING (LLL) LINES.
9.2.1. GENERAL
The direction to be followed by evacuees to the closest escape path and
final exit should be marked unambiguously and be recognisable from any
point in the premises.
Signs should be placed with sufficient frequency to provide continual reinforcement that evacuees are moving along the escape path. Signs should be provided and installed following recommendations 9.2.2, 9.2.3. and 9.2.4. to determine the luminance properties, location, number and size of emergency and escape path directional signs. The use of additional photoluminescent signing and markers to provide visible safety information in darkness and additional orientation cues to evacuees and intervention forces is recommended as described in 9.2.5. to 9.2.8.
Photoluminescent low location lighting (LLL) lines are installed to delineate clearly the escape path as described in 9.2.9.
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