5.1.6 Central fire alarm panels, fire alarm call points, and firefighting apparatuses must receive adequate lighting to facilitate easy navigation and, if they are not located on escape route or in open area, must receive at least 5 lux at surrounding floor surface (see Figure A.4).

5.2 Exit instruction

5.2.1 Exit sign

Additional exit signs are required at all entrances and exits of evacuation staircases, escape routes on all storeys, and all exits of rooms having at least 2 escape routes;

Installation of exit signs is not required in:

- Rooms equipped with emergency lighting and also satisfying any of the following requirements:

+ There is only one way in or out; or

+ There is one exit leading to single-loaded corridor or outdoor space.

- Rooms not equipped with emergency lighting and also satisfying any of the following requirements:

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+ Maximum distance from any point of the room to the way in or out is 13 m, at least 50% of wall segment adjoining corridor is glass, and at least one of the following conditions is met:

. Doors opened into corridors are outfitted with emergency lighting;

. Doors opened into single-loaded corridor or directly outside.

- Single-storey buildings where floor area does not exceed 200 m², area of openings on exterior wall takes up at least 80%.

5.2.2 Direction escape route sign

Direction escape route signs must be installed along escape route, in rooms, and areas where visibility to escape route is obstructed.

Direction escape route signs are not required in:

- Roofless courtyards and rooftops.

- Single-storey building with only roofs (with no surrounding walls) where floor area does not exceed 200 m² and area of openings takes up at least 80% of total exterior wall area.

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Low-level exit signs and direction escape route signs are required on storeys where lounges are located in hotels of at least 7 storeys or minimum total volume of 5.000 m³ having exit corridor longer than 10 m.

The lowest point of low-level signs must be 150 mm to 200 mm above the floor surface. Each low-level sign must be at most 10 m away from one another. In respect of emergency exit doors, safety signs must be positioned above or adjacent to the doors where sides of the signs that are nearest to the doors are at most 100 mm away from door frame (see Figure A.5).

Low-level safety signs are designed to guide inhabitants and employees in buildings to reach exit accesses in case smoke obscures exits or direction escape route signs above doors and are not meant to replace standard safety signs.

5.2.4 Luminance

Luminance of safety signs must meet requirements below:

- During normal operating mode: luminance must conform to ISO 3864-1.

- Emergency operating mode: minimum luminance of signs regardless of direction is 2 cd/m²; where visibility is potentially affected by smoke produced by the fire, minimum luminance must be 10 cd/m² (see Figure A.8).

5.2.5 Uniformity

- Uniformity of colors: Uniformity of luminance within range of safe color and contrasting color is measured by the ratio between maximum and minimum luminance of the color which must be greater than 1:5.