Table of Contents
Advertisement
Information on EN 54-23
In the event of a fire, visual alarm devices are used to warn and alert people in or near a building. This enables
the people that have been warned to leave the danger zone safely and take appropriate action.
The advantage of a visual alarm is that – in areas with a high level of ambient noise or where people wear ear
defenders when working – it is easily noticed and attracts the attention of the people that need to be alerted.
Visual and acoustic alarms can also be used in combination. This may be required to ensure that people who
are hard of hearing are also warned/alerted appropriately.
Definitions
Visual alarm device (VAD):
A device that features a flashing light in order to visually alert people in the building to the fact that a fire has
broken out.
Signal range:
Range in which the illumination level of (0.4 lm/m² [lx] to the normal of the light source) required by EN 54-23 is
achieved.
Device categories (W; C; O):
Visual alarm devices (VAD) in accordance with EN 54-23 are divided into the following three device categories.
There are different requirements for the signal range for each device category.
Category C for ceiling-mounted alarm devices
•
These devices have a cylinder-shaped signal range, defined by C-x-y.
Category W for wall-mounted alarm devices
•
These devices have a cube-shaped signal range, defined by W-x-y.
Category O for alarm devices where the installation position is left open.
•
For these devices, the manufacturer specifies the geometric dimensions.
Light colour:
Visual alarm devices in accordance with EN 54-23 must emit a white or red light.
Flash frequency:
In accordance with EN 54-23, the flash frequency of a visual alarm device must be in the range [0.5...2 Hz].
TI 798960.GB0 / 04.20
Periphery components for ESSER FACP
59
Advertisement
Table of Contents
