ZETTLER EN54-23 Addressable Visual Alarm Devices

 
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EN54-23 Addressable Visual Alarm Devices

A new harmonised standard becomes mandatory from December 31st 2013 which is EN54-23:2010. This standard is for all visual alarm devices (beacons) used on a fire system. There are several reasons for providing visual alarms for fire alarm systems, including:

  • To alert people with a hearing loss
  • Noisy areas where occupants are wearing ear defenders
  • For staff alarms
  • For use in broadcasting studios
  • Areas such as hospital operating theatres
  • Stage one visual alarms for extinguishing systems

Each of these applications will be required to use visual alarm devices that comply with EN 54 – 23. The standard does not apply to visual indicators such as remote LEDs or to supplementary visual alarms that are not considered part of the primary alarm system.
  

The standard covers planning, design, installation, commissioning and service and is intended to ensure that visual alarms are sufficiently bright to be effective as a primary means of alarm. To achieve this, the standard stipulates a minimum light level of 0.4lux on any surface, and manufacturers must specify the room size their product will cover with this level of illumination.

There are three categories of visual alarm device recognised by EN54-23:

 

Open Class (O)

Open class allows the manufacturer to specify the coverage volume and coverage shape does not restrict mounting height. The required illumination of 0.4 lux still applies.

The effectiveness of any visual alarm is not just dependent on the light output of the device. Ambient light levels also have to be taken into consideration. Greater coverage will be achieved in darker conditions and conversely, visual alarm devices will have less coverage in bright ambient conditions. To assist sellers and system designers, we will be offering a series of training events as well as making available reference material and guidance notes.

Wall Category (W)

A coverage volume code is presented as W – x – y, where W is for Wall, x is the maximum mounting height and y is the width of the square area covered (in metres) by the device.

The minimum mounting height for wall category is 2.4m. For example, the coverage code on a product may be presented as W – 2.4 – 7.5

Ceiling Category (C)

The coverage volume code will be presented as C – x – y, where C is for Ceiling, x is the maximum mounting height and y is the diameter in metres of the cylindrical coverage volume.

Ceiling mounted products are specified for maximum heights of 3m, 6m or 9m. For example, the coverage code on a product may be presented as C – 3 – 7.5

   
  
     

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