7.5. FLAMMABILITY
Photoluminescent materials to be used as continuous wall or floor linings should be minimum Class I II tested according to BS 476 Part 7 1987 (Surface Spread of Flame).

8 CATEGORISING LEVEL OF RISK AREAS OF PREMISES FOR THE PURPOSE OF EMERGENCY WAYFINNDING GUIDANCE SYSTEM DESIGN.

8.1. GENERAL
The purpose of a photoluminescent wayfinding guidance system is to provide visual orientation cues in sudden darkness and to communicate and provide continually supportive information concerning the location and direction of escape paths.

The wayfinding guidance system should be designed as a function of the difficulty and risk likely to be encountered by occupants in following the escape path to the final exit. The system should be designed by adapting the amount of material, the location and the luminance properties as a function of the risk level and presence or not of other emergency lighting provisions and in particular those provided for by National or International Standards. The appropriate photoluminescent wayfinding guidance system for particular areas of the occupied premises should be agreed as part of the consultation process described in Section 3.0., and should be categorised according to the definitions and recommendations of the risk levels described in 8.2. to 8.4.

8.2. LEVEL 1 RISK AREAS
These areas will be internally illuminated under normal conditions to National and International Health and Safety at Work Standards and have a substantial source of external light from windows or skylights. These areas of the premises are normally occupied in daylight hours. Emergency lighting according to National or International minimum requirements is installed in most areas and is of the maintained (M) operation category. A Level 1 risk area will cover those areas protected by battery operated emergency lighting systems meeting National or International minimum requirements where the photoluminescent wayfinding guidance system will provide the necessary back up to the emergency lighting.

8.3. LEVEL 2 RISK AREAS
These areas will be internally illuminated under normal conditions according to National or International minimum requirements but not benefiting from a substantial source of external light or occupied regularly during darkness hours. Emergency lighting according to National or International minimum requirements is installed in most areas and is principally of the non-maintained (NM) operation category.

Level 1 Risk Areas usually have a substantial source of external light. ie: places of noremal use, offices etc.

Level 2 Risk Areas are usually areas totally illuminated by electrical lighting, ie: in shopping centres, large industrial areas and internal offices.

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