EN 14972-1:2020/prA1

SLOVENSKI STANDARD
01-julij-2024
Vgrajeni gasilni sistemi - Sistemi s pršečo vodo - 1. del: Načrtovanje, vgradnja,
pregled in vzdrževanje
Fixed firefighting systems - Water mist systems - Part 1: Design, installation, inspection
and maintenance
Ortsfeste Brandbekämpfungsanlagen - Wassernebelsysteme - Teil 1: Planung, Einbau,
Inspektion und Wartung
Installations fixes de lutte contre l'incendie - Systèmes à brouillard d'eau - Partie 1 :
Conception, installation, inspection et maintenance
Ta slovenski standard je istoveten z: EN 14972-1:2020/prA1
ICS:
13.220.10 Gašenje požara Fire-fighting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
EN 14972-1:2020
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
May 2024
ICS 13.220.20
English Version
Fixed firefighting systems - Water mist systems - Part 1:
Design, installation, inspection and maintenance
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Brandbekämpfungsanlagen - Feinsprüh-
à brouillard d'eau - Partie 1 : Conception, installation, Löschanlagen - Teil 1: Planung, Einbau, Inspektion und
inspection et maintenance Wartung
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 191.

This draft amendment A1, if approved, will modify the European Standard EN 14972-1:2020. If this draft becomes an
amendment, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
inclusion of this amendment into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14972-1:2020/prA1:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Modification to Clause 3, “Terms and definitions” . 4
2 Modifications to Clause 4, “Design” . 4
3 Addition of new Annex C, “Limits of applicability for water mist systems tested in
accordance to EN 14972-2” . 8
4 Addition of new Annex D, “Limits of applicability for water mist systems tested in
accordance to EN 14972-3” . 11
5 Addition of new Annex E, “Limits of applicability for water mist systems tested in
accordance to EN 14972-4” . 13
6 Addition of new Annex F, “Limits of applicability for water mist systems tested in
accordance to EN 14972-5” . 15
7 Addition of new Annex G, “Limits of applicability for water mist systems tested in
accordance to EN 14972-6” . 16
8 Addition of new Annex H, “Limits of applicability for water mist systems tested in
accordance to EN 14972-7” . 17
9 Addition of new Annex I, “Limits of applicability for water mist systems tested in
accordance to EN 14972-8” . 18
10 Addition of new Annex J, “Limits of applicability for water mist systems tested in
accordance to EN 14972-9” . 20
11 Addition of new Annex K, “Limits of applicability for water mist systems tested in
accordance to EN 14972-10” . 22
12 Addition of new Annex L, “Limits of applicability for water mist systems tested in
accordance to EN 14972-11” . 23
13 Addition of new Annex M, “Limits of applicability for water mist systems tested in
accordance to EN 14972-12” . 24
14 Addition of new Annex N, “Limits of applicability for water mist systems tested in
accordance to EN 14972-13” . 25
15 Addition of new Annex O, “Limits of applicability for water mist systems tested in

accordance to EN 14972-14” . 26
16 Addition of new Annex P, “Limits of applicability for water mist systems tested in
accordance to EN 14972-15” . 27
17 Addition of new Annex Q, “Limits of applicability for water mist systems tested in
accordance to EN 14972-16” . 28
18 Addition of new Annex R, “Limits of applicability for water mist systems tested in
accordance to EN 14972-17” . 29
19 Addition of new Annex S, “General tolerances” . 30

European foreword
This document (EN 14972-1:2020/prA1:2024) has been prepared by Technical Committee CEN/TC 191
“Fixed firefighting systems”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
1 Modification to Clause 3, “Terms and definitions”
Replace the term 3.1.6 with the following:
"
3.1.6
automatic water mist nozzle
component with one or more orifices, which is designed to produce and discharge water mist
automatically, where the nozzles operate independently of other nozzles by means of a
detection/activation device built into the nozzle
”.
2 Modifications to Clause 4, “Design”
Add the following paragraph at the end of 4.1.1:
“If no other tolerance is specified, the general tolerances in Annex S shall be applied.”.

Replace the paragraph in 4.1.3.1 with the following:
“The safe use of a water mist system is limited to applications it has been tested for. Water mist systems
shall be tested in accordance with the fire test protocols of the EN 14972 series.
Annex A gives guidelines on how to develop new fire test protocols to be added under the EN 14972
series.
The applicability of the fire test protocols are described in Annexes C through R. For the given application,
the relevant annex shall be applied.”

In 4.2.2, item c), add “and storage” to read:
“c) description of hazards and storage”.

In 4.9.4.3, replace Table 1 with the following:
“
Table 1 — Design criteria
c d
Occupancy Minimum design Minimum nozzle Fire test protocol
a a
quantity
area
Sales areas, storage areas adjacent 216 m — EN 14972-2
to sales areas, archives, libraries,
technical areas/mechanical floors
or similar.
Cellular offices and open plan 72 m 6 EN 14972-3
offices, areas with counters,
restaurants and kitchens, public
areas in buildings with low fire
load, escape routes or other
corridors, churches, museums,
hotel rooms, rooms in hospitals,
nursing homes, senior citizens
residences, flats, training
classrooms, recreation areas. As
well as further comparable risks.
Apartments, churches, concealed 140 m 9 EN 14972-4
spaces (greater 800 mm in height),
gymnasiums, hospitals and
hospital laboratories, hotel rooms,
libraries, museums, offices,
meeting rooms, restaurant seating
areas, kitchens, schools and
university class rooms, unused
attics, institutions.
Non-stacking garages, fully 144 m (wet — EN 14972-5
enclosed garages and underground system)
garages for horizontal, solid, flat
180 m (dry
ceilings with heights of 2 m and
system)
above.
Horizontal false ceilings and false 72 m 6 EN 14972-6
floors between 300 mm and
800 mm.
Apartments, churches, concealed 72 m 6 EN 14972-7
spaces, gymnasiums, hospitals,
hotel rooms, libraries, museums,
offices, restaurant seating areas,
schools and university class rooms
and unused attics.
c d
Occupancy Minimum design Minimum nozzle Fire test protocol
a a
area quantity
Dwelling house, flat, maisonette, For rooms greater All nozzles in the EN 14972-17
transportable home, house of than 64 m : largest
multiple occupation, bed and compartment up
64 m
breakfast accommodation, to maximum 4.
boarding houses and blocks of flats
of 18 m or less in height and with a
maximum total floor area of
2 400 m .
Blocks of flats greater than 18 m up For rooms greater 4 EN 14972-17
to 45 m in height, sheltered and than 64 m :
extra care housing, residential care 2
64 m
premises, residential rehabilitation
accommodation, dormitories and
b
hostels up to 45 m in height .
a
Values applicable for wet pipe water mist systems unless indicated.
b
Some countries may have national annex with guidance on the maximum height and any additional
requirements for apartment buildings higher than 18 m.
c
The overlap in occupancies described in the table is due to more than one fire test protocol in EN 14972
series, covering the same occupancy. Refer to Annexes C through R, and the DIOM manual, for the minimum
design criteria for the respective fire test protocol for the water mist system.
d
The occupancies are intended to be covered by the fire test protocols (see the European foreword). Where
available are listed in column and otherwise are in preparation.
”.
In 4.13.5, replace Table 3 with the following:
“
Table 3 — Minimum discharge operating time
Fire extinguishing Discharge operating time
systems
Wet benches Twice the extinguishment time.
Minimum operation time is 2 min.
Time delay limited to 30 s, unless otherwise proven in the tests.
Commercial deep fat Twice the total time it takes to extinguish the fire and to cool the oil below
cooking fryers the auto-ignition temperature in accordance with the fire test protocol.
Minimum operation time is 10 min.

Industrial oil cookers Twice the total time it takes to extinguish the fire and to cool the oil below
the flash point in accordance with the fire test protocol.
Minimum operation time is 10 min.
Other fire extinguishing Whichever is greater:
systems
— twice the longest extinguishment time in the relevant fire tests;
— the time to shut down the process equipment; or
— 10 min.
”.
In 4.13.5, replace Table 4 with the following:
"
Table 4 — Minimum time of operation
a
Occupancy Minimum Fire test protocol
Operation Time
min
Sales areas, storage areas adjacent to sales areas, 60 EN 14972-2
archives, libraries, technical areas or similar.
Cellular offices and open plan offices, areas with 60 EN 14972-3
counters, restaurants and kitchens, public areas in
buildings of low fire load, escape routes or other
corridors, churches, museums, hotel rooms, rooms
in hospitals, nursing homes, senior citizens
residences, flats, training classrooms, recreation
areas. As well as further comparable risks.
Apartments, churches, concealed spaces (greater 60 EN 14972-4
800 mm in height), gymnasiums, hospitals and
hospital laboratories, hotel rooms, libraries,
museums, offices, meeting rooms, restaurant
seating areas, kitchens, schools and university class
rooms, unused attics, institutions.
Non-stacking garages, fully enclosed garages and 60 EN 14972-5
underground garages for horizontal, solid, flat
ceilings with heights of 2 m and above.
Horizontal false ceilings and false floors between 60 EN 14972-6
300 mm and 800 mm.
Apartments, churches, concealed spaces, 60 EN 14972-7
gymnasiums, hospitals, hotel rooms, libraries,
museums, offices, restaurant seating areas, schools
and univ
...