SIST EN 12845-2:2025

SLOVENSKI STANDARD
01-februar-2025
Vgrajene naprave za gašenje - Avtomatski sprinklerski sistemi - 2. del:
Projektiranje in vgradnja sprinklerskih sistemov ESFR in CMSA
Fixed firefighting systems - Automatic sprinkler systems - Part 2: Design and installation
of ESFR and CMSA sprinkler systems
Ortsfeste Feuerlöschanlagen– Automatische Sprinkleranlagen– Teil2: Auslegung und
Installation von Sprinklern zur frühzeitigen Unterdrückung und schnellen Reaktion
Installations fixes de lutte contre l'incendie - Systèmes d'extinction automatique du type
sprinkleur - Partie 2 : Conception et installation de système de sprinkleurs ESFR et
CMSA
Ta slovenski standard je istoveten z: EN 12845-2:2024
ICS:
13.220.10 Gašenje požara Fire-fighting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12845-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 13.220.20
English Version
Fixed firefighting systems - Automatic sprinkler systems -
Part 2: Design and installation of ESFR and CMSA sprinkler
systems
Installations fixes de lutte contre l'incendie - Systèmes Ortsfeste Feuerlöschanlagen - Automatische
d'extinction automatique du type sprinkleur - Partie 2 : Sprinkleranlagen - Teil 2: Auslegung und Installation
Conception et installation de système de sprinkleurs von Sprinklern zur frühzeitigen Unterdrückung und
ESFR et CMSA schnellen Reaktion
This European Standard was approved by CEN on 11 November 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
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 12845-2:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions, symbols and abbreviated terms . 5
3.1 Terms and definitions . 5
3.2 Symbols and abbreviated terms . 6
4 General. 6
5 Installation requirements . 7
5.1 Sprinkler type, spacing, clearance and nominal operating temperature . 7
5.2 Construction and building limitations . 12
5.3 Obstruction to discharge pattern of sprinklers . 21
5.4 Additional requirements for protection of HHS5, with 12 sprinkler design . 32
6 Design considerations . 33
6.1 General. 33
6.2 Protection of non-storage occupancies with ESFR and CMSA . 33
6.3 Sprinkler protection for adjacent areas using a different protection concept . 34
6.4 Water supply duration and shape of design . 34
6.5 Protection of unheated areas with ESFR installations . 35
6.6 Design with ESFR . 35
6.7 Design with CMSA . 48
Annex A (normative) Extract for determining the hazard classification from prEN 12845-1 . 59

European foreword
This document (EN 12845-2:2024) has been prepared by Technical Committee CEN/TC 191 “Fixed
firefighting systems”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document is included in a series of European standards:
— CEN/TS 14816, Fixed firefighting systems - Water spray systems - Design, installation and
maintenance;
— CEN/TS 17551, Fixed firefighting systems - Automatic sprinkler systems - Guidance for earthquake
bracing;
— EN 671 (all parts), Fixed firefighting systems - Hose systems;
— EN 12094 (all parts), Fixed firefighting systems - Components for gas extinguishing systems;
— EN 12101 (all parts), Smoke and heat control systems;
— EN 12259 (all parts), Fixed firefighting systems - Components for sprinkler and water spray systems;
— EN 12416 (all parts), Fixed firefighting systems - Powder systems;
— EN 12845, Fixed firefighting systems - Automatic sprinkler systems - Design, installation and
maintenance;
— EN 13565 (all parts), Fixed firefighting systems - Foam systems;
— EN 14972 (all parts), Fixed firefighting systems - Water mist systems;
— EN 17451, Fixed firefighting systems - Automatic sprinkler systems - Design, assembly, installation and
commissioning of pump sets.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
Introduction
ESFR (early suppression fast response) sprinkler protection to this standard utilizes sprinklers in
accordance with EN 12259-13 operating in suppression mode, i.e. which have the capability of markedly
suppressing (reducing the heat release rate of) fires typically within storage risks. ESFR sprinkler
protection tends to be used in high hazard storage scenarios to provide effective ceiling-only sprinkler
protection (although ESFR protection schemes utilizing in-rack sprinkler heads do also exist). Designs
are typically specified in terms of k-factors, numbers of heads operating and required head pressures.
CMSA (Control Mode Specific Application) sprinkler protection to this standard utilizes sprinklers
operating in control mode, i.e. which have the capability of controlling (limiting the heat release rate)
fires within storage risks. CMSA sprinkler protection tends to be used in a variety of specific challenges
of high hazard storage scenarios, where alternative approaches are not considered suitable. Designs are
typically specified in terms of numbers of heads operating and required head pressures.
CMDA (control mode density area) sprinkler protection to EN 12845-1 typically utilizes sprinklers in
accordance with EN 12259-1 operating in control mode, i.e. which have the capability of controlling
(limiting the heat release rate) fires in residential, commercial, industrial or storage applications. CMDA
sprinkler protection tends to be used to good effect in a wide variety of built environment scenarios.
Designs are typically specified in terms of a minimum application rate of water “density” (mm/min) to
be applied over a specified area of operation “area”.
All three approaches are designed to provide rapid and effective control of a fire. The selection of the
most appropriate option is best entrusted to competent personnel. In all cases, it is expected that final
extinguishment to be performed by the Fire and Rescue Service will be necessary.
Both sprinkler types ESFR and CMSA were developed for storage fires. The ESFR sprinkler concept is a
technical innovation developed from CMSA sprinklers. ESFR and CMSA sprinkler designs are less able to
cope with adverse design features and non-compliances (e.g. those caused by incorrect design or change
in practice in the protected premises over time). The risk that design and installation deviations from this
standard are likely to result in a total system failure is highlighted, as is the particular importance of
complying with all the requirements of this standard, without exception.
It is planned to publish an Amendment for EN 12845:2015+A1:2019 to align it with this document and
update the references for ESFR and CMSA requirements. Annex A in this document was added to support
this transition.
1 Scope
This document specifies requirements for the design and installation of early suppression fast response
(ESFR) and control mode specific application (CMSA) sprinklers in automatic sprinkler systems, in
accordance with this standard and additionally the EN 12845 series of standards.
This document does not cover all legislative requirements.
NOTE In certain countries, specific national regulations can apply. Attention is drawn to the applicability or
non-applicability for this document as specified by national responsible authorities.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12845:2015+A1:2019, Fixed firefighting systems — Automatic sprinkler systems —Design, installation
and maintenance
EN 12845 (series), Fixed firefighting systems — Automatic sprinkler systems
EN 12259-1, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 1:
Sprinklers
EN 12259-13, Fixed firefighting systems — Components for sprinkler and water spray systems — Part 13:
ESFR sprinklers
prEN 12259-15, Fixed firefighting systems — Components for sprinkler and water spray systems — Part
15: Spray pattern sprinklers with a k-factor of at least K160, extended coverage sprinklers of at least K80
and control mode special application sprinklers
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in the EN 12845 series of standards,
EN 12259-1, EN 12259-13, prEN 12259-15 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
open-top containers
boxes having an open top and which can retain water
Note 1 to entry: Containers that have five sides will collect and hold up water that has been discharged from
operating sprinklers thus delaying the water delivery down through the flue spaces where it is needed to either
suppress or control the fire.
Note 2 to entry: Containers with less than five full-height sides redirect the discharged water from operating
sprinklers so that the water delivery down through the flues is not uniform. Five-sided, open-top containers made
of wood, cardboard, plastic, or other combustible material promote faster horizontal fire spread compared to
closed-top combustible containers.
Note 3 to entry: Non-combustible open-top containers help promote faster horizontal fire spread if combustible
containers are loca
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