Firefighting technical bulletin 04

Firefighting technical bulletin 04


First of all, a method note is allowed:

the absence of a European unitary standard on detection and fire alarm signalling is a real Achilles heel for the engineers.

The technical specification EN 54-14 is, in fact, so weak and generic that it is never reproduced in any technical specification of an international nature.

This leads to a deficit in the competitiveness of European fire detection products compared to UL or FM approved standards.

Firefighting technical bulletin 04

Design examples

On the horizon, in this regard, there is nothing new.

It is therefore logical that UNI working group is working on a guideline for audible and visible devices.

This guideline, which is being prepared, will presumably be available by the end of this year.

In any case, a careful reading of UNI 9795 would allow having sufficient tools for the design of the horns.

The missing link concerns, therefore, the light alarms, for which there are no precise sizing criteria.

The guideline is derived from the UK Code of Practice, which presents very detailed elements to determine the spacing and installation of visual alarm devices.


The guideline does not offer a tool to choose whether it is necessary to provide sound, light or sound-light alarms. This remains linked to the risk analysis.

It is therefore inappropriate to prescribe a fire detection and alarm system according to UNI 9795; without indicating which types of signalling devices to adopt.

The use of the British Code of Practice on light alarms will, therefore presumably, lead to a gradual migration towards systems with only acoustic warning devices.

Preliminary calculations indicate, in fact, that the cost of a mixed acoustic and light system will be decidedly higher compared to current systems.


Examples of Realization