Fire resistance tests for service installations - Part 5: Service ducts and shafts

This European Standard specifies a method for determining the fire resistance of horizontal service ducts and vertical service shafts, which pass through walls or floors and enclose pipes and cables. The test examines the behaviour of ducts and shafts exposed to fire from outside and from inside the duct. This European Standard is intended to be read in conjunction with EN 1363-1.
This European Standard does not examine the risk of fire spread as a result of thermal conduction along the piping installed in service ducts or shafts, or thermal conduction through the media these pipes carry. It does not cover the risk of damage produced by thermal elongation or shortening of tubes and cables as a result of fire, or damaged pipe suspensions. This European Standard does not give guidance on how to test one, two or three sided service ducts or shafts.
NOTE   Guidance on testing service ducts and shafts of less than four sides will be covered in the extended field of application rules being developed by CEN/TC 127.
This test is unsuitable for evaluating service ducts with internal barriers at walls and floors.
Whilst the walls of service ducts or shafts tested to this method may provide specified levels of integrity or insulation, testing to this European Standard does not replace the testing of the functional endurance of small electrical cables which is covered in EN 50200.
Fire resistance testing of ducts for air distribution systems is covered in EN 1366-1.

Feuerwiderstandsprüfungen für Installationen - Teil 5: Installationskanäle und -schächte

Dieses Dokument legt ein Prüfverfahren für die Ermittlung der Feuerwiderstandsfähigkeit von horizontalen Installationskanälen und vertikalen Installationsschächten, die Wände oder Decken durchqueren und Rohre und Kabel beinhalten, fest mit dem Ziel, eine Klassifizierung nach EN 13501-2 vorzunehmen. Die Prüfung ermittelt das Verhalten von Installationskanälen und -schächten bei Brandbeanspruchung sowohl von außerhalb als auch von innerhalb des Systems. Dieses Dokument gilt in Verbindung mit EN 1363 1.
Dieses Dokument befasst sich nicht mit der Gefahr der Brandübertragung infolge von Wärmeleitung durch die Rohrleitungen oder Kabel, die in Installationskanälen oder –schächten installiert sind, oder infolge von Wärmeleitung über die Medien, welche diese Rohrleitungen führen. Diese Prüfung deckt auch nicht die Gefahr der Beschädigung durch die thermische Verlängerung oder Verkürzung von Rohren oder Kabeln infolge eines Brandes oder durch beschädigte Rohraufhängungen ab. Dieses Dokument enthält keine Anleitung zum Prüfen von ein-, zwei- oder dreiseitigen Installationskanälen oder Installationsschächten.
ANMERKUNG   Eine Anleitung zum Prüfen von Installationskanälen und –schächten mit weniger als vier Seiten wird von den Regeln zum erweiterten Anwendungsbereich abgedeckt werden, die im CEN/TC 127 in Erarbeitung sind.
Die Prüfung kann sowohl für Systeme mit Platten als auch für Systeme mit einer durchgehenden Abdeckung aus intumeszierenden Materialien auf den Platten angewendet werden. Sie kann nicht für Systeme angewendet werden, in denen intumeszierendes Material nur im Bereich der Durchführung aufgebracht wird.
Diese Prüfung eignet sich nicht für die Bewertung von Installationskanälen oder –schächten mit inneren Abschottungen im Bereich von Wänden und Decken.
Die Prüfung ist ungeeignet für die Bewertung von Brandschutzsystemen für Kabelsysteme und zugehörige Komponenten zur Aufrechterhaltung des Raumabschlusses im Brandfall. Dies wird in EN 1366 11, Feuerwiderstandsprüfungen für Installationen — Teil 11: Brandschutzsysteme für Kabelanlagen und zugehörige Komponenten, behandelt.
Obwohl die Wände der nach diesem Verfahren geprüften Installationskanäle oder -schächte eine bestimmte Klasse des Raumabschlusses oder der Wärmedämmung liefern können, ersetzt eine Prüfung nach diesem Dokument nicht die Prüfung des Funktionserhalts von elektrischen Kabeln nach EN 50200.
Die Feuerwiderstandsprüfung von Lüftungsleitungen wird in EN 1366 1 behandelt.

Essais de résistance au feu des installations de service - Partie 5 : Gaines pour installation technique

Le présent document spécifie une méthode de détermination de la résistance au feu des gaines horizontales ou verticales pour installation technique qui traversent les murs ou les planchers et qui enferment des tuyaux et des câbles, afin de les classer conformément à l’EN 13501-2. Le scénario d’essai examine le comportement des gaines exposées à un feu depuis l’extérieur ou depuis l’intérieur du système. Le présent document est destiné à être lu conjointement avec l’EN 1363-1.
Le présent document ne traite pas des risques de propagation du feu dus à la conduction de chaleur le long des canalisations ou des câblages installés dans les gaines pour installation technique ou au transfert de chaleur à travers les fluides qu’ils véhiculent. Il ne traite pas non plus des risques de dégradation produite par allongement ou raccourcissement thermique des tubes et des câbles suite à un incendie, ni de la détérioration des dispositifs de suspension des tuyaux. Ce document ne fournit pas de conseils sur la manière d’essayer les gaines pour installation technique à un, deux ou trois côtés.
NOTE Les conseils relatifs à l’essai des gaines pour installation technique ayant moins de quatre côtés seront traités dans les règles de domaine d’application étendue actuellement en cours d’élaboration au sein du CEN/TC 127.
Cet essai peut être utilisé pour les systèmes munis de plaques et également pour les systèmes dont les plaques comportent une couverture continue en matériaux intumescents. Il ne peut pas être utilisé pour des systèmes dans lesquels le matériau intumescent est seulement appliqué dans la zone de pénétration.
Le présent essai ne convient pas à l’évaluation des gaines pour installation technique avec recoupements internes au niveau des murs et planchers.
Le présent essai ne convient pas à l’évaluation des systèmes de protection incendie pour les systèmes de câbles et composants associés dont la fonctionnalité électrique est maintenue en cas d’incendie. Ces derniers sont couverts par l’EN 1366-11 : Systèmes de protection incendie pour les systèmes de câbles et composants associés - Partie 11 : Systèmes de protection incendie pour les systèmes de câbles et composants associés.
Bien que les parois des gaines pour installation technique soumises à l’essai selon la présente méthode puissent fournir des niveaux spécifiés d’étanchéité au feu ou d’isolation thermique, l’essai conformément au présent document ne remplace pas les essais de résistance fonctionnelle des petits câbles électriques traités dans l’EN 50200.
Les essais de résistance au feu des conduits de ventilation sont traités dans l’EN 1366-1.

Preskusi požarne odpornosti servisnih inštalacij - 5. del: Servisni kanali in jaški

General Information

Status
Published
Public Enquiry End Date
24-Apr-2019
Publication Date
11-Feb-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Feb-2021
Due Date
18-Apr-2021
Completion Date
12-Feb-2021

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SLOVENSKI STANDARD
SIST EN 1366-5:2021
01-marec-2021
Nadomešča:
SIST EN 1366-5:2010

Preskusi požarne odpornosti servisnih inštalacij - 5. del: Servisni kanali in jaški

Fire resistance tests for service installations - Part 5: Service ducts and shafts

Feuerwiderstandsprüfungen für Installationen - Teil 5: Installationskanäle und -schächte

Essais de résistance au feu des installations de service - Partie 5 : Gaines pour

installation technique
Ta slovenski standard je istoveten z: EN 1366-5:2021
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
SIST EN 1366-5:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1366-5:2021
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SIST EN 1366-5:2021
EN 1366-5
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 13.220.50; 91.060.40 Supersedes EN 1366-5:2010
English Version
Fire resistance tests for service installations - Part 5:
Service ducts and shafts

Essais de résistance au feu des installations de service - Feuerwiderstandsprüfungen für Installationen - Teil 5:

Partie 5 : Gaines pour installation technique Installationskanäle und -schächte
This European Standard was approved by CEN on 27 December 2020.

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, Turkey 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1366-5:2021 E

worldwide for CEN national Members.
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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
Contents Page

European foreword ............................................................................................................................................. 4

Introduction .......................................................................................................................................................... 5

1 Scope .......................................................................................................................................................... 6

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 7

4 Test equipment ...................................................................................................................................... 7

4.1 General ...................................................................................................................................................... 7

4.2 Furnace ..................................................................................................................................................... 7

4.3 Loading equipment ............................................................................................................................... 7

4.4 Gas extraction equipment (optional)............................................................................................. 7

5 Test conditions ....................................................................................................................................... 8

5.1 Furnace ..................................................................................................................................................... 8

5.2 Loading...................................................................................................................................................... 8

6 Test specimen ......................................................................................................................................... 8

6.1 Size .............................................................................................................................................................. 8

6.1.1 General ...................................................................................................................................................... 8

6.1.2 Length ........................................................................................................................................................ 8

6.1.3 Cross-section ........................................................................................................................................... 8

6.2 Number ..................................................................................................................................................... 8

6.3 Design ........................................................................................................................................................ 9

6.3.1 General ...................................................................................................................................................... 9

6.3.2 Duct and shaft arrangement.............................................................................................................. 9

7 Installation of test specimen ...........................................................................................................10

7.1 General ....................................................................................................................................................10

7.2 Standard supporting construction ................................................................................................11

7.3 Non-standard supporting constructions ....................................................................................11

8 Conditioning ..........................................................................................................................................11

8.1 General ....................................................................................................................................................11

8.2 Water based sealing materials .......................................................................................................11

9 Application of instrumentation .....................................................................................................11

9.1 Thermocouples ....................................................................................................................................11

9.1.1 Furnace thermocouples (plate thermometers) .......................................................................11

9.1.2 Thermocouple locations ...................................................................................................................12

9.2 Pressure ..................................................................................................................................................12

10 Test procedure .....................................................................................................................................12

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SIST EN 1366-5:2021
EN 1366-5:2021 (E)

10.1 General ................................................................................................................................................... 12

10.2 Test measurements and observations ........................................................................................ 13

10.2.1 General ................................................................................................................................................... 13

10.2.2 Integrity ................................................................................................................................................. 13

10.2.3 Insulation (temperature of the surfaces outside the furnace – for both fire exposure

at the inside and exposure at the outside) ................................................................................ 13

10.2.4 Additional observations ................................................................................................................... 13

10.3 Termination of the test ..................................................................................................................... 14

11 Performance criteria ......................................................................................................................... 14

11.1 Integrity ................................................................................................................................................. 14

11.2 Insulation ............................................................................................................................................... 14

11.2.1 Insulation criteria for service ducts and shafts with combustible and

noncombustible services ................................................................................................................. 14

12 Test report ............................................................................................................................................ 14

13 Field of direct application of test results ................................................................................... 15

13.1 Walls or floors through which the service ducts or shafts lead ......................................... 15

13.2 Sizes of ducts or shafts ...................................................................................................................... 15

13.3 Shapes ..................................................................................................................................................... 15

13.4 Admissible services ........................................................................................................................... 15

13.5 Suspension devices for ducts.......................................................................................................... 15

13.5.1 Material and sizing ............................................................................................................................. 15

13.5.2 Elongation ............................................................................................................................................. 16

13.6 Distances ................................................................................................................................................ 16

13.6.1 Distance to the supporting construction .................................................................................... 16

13.6.2 Distance of the first joint after the supporting construction .............................................. 16

13.6.3 Distance between service ducts or service shafts in practice ............................................ 16

13.6.4 Distance between service outlets and penetrated wall or floor ........................................ 16

13.7 Access panels ........................................................................................................................................ 16

13.8 Service outlets ...................................................................................................................................... 16

Bibliography ....................................................................................................................................................... 27

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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
European foreword

This document (EN 1366-5:2021) has been prepared by Technical Committee CEN/TC 127 “Fire safety

in buildings”, 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 August 2021, and conflicting national standards shall be

withdrawn at the latest by August 2021.

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 supersedes EN 1366-5:2010.
Against EN 1366-5:2010 the following changes were introduced:
1) necessary dated references were updated;
2) clearer rules were given for the scope of the standard;
3) terms and definitions clarified and completed;

4) the location of thermocouples was clarified especially when testing the specimen including service

outlets and access panels;
5) drawings were improved and aligned to changes;

6) the thermocouple T3 from Version 2010 was deleted. It is not needed for measuring the property

„Integrity” and it leads to confusion concerning that property.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

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, Turkey and the United

Kingdom.
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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
Introduction

The purpose of this test is to measure the ability of a service duct or shaft to resist the spread of fire from

one fire compartment to another with fire attack from inside or outside the duct or shaft. The test

specimens incorporate joints, service outlets and access openings as intended in practice and are

suspended as they would be in practice. Test specimens of service ducts are not loaded as in practice but

a standard load is included to represent a typical service load. Test specimens of service shafts are not

loaded as in practice, but a standard load is included to represent a typical service load.

CAUTION — The attention of all persons concerned with managing and carrying out this fire

resistance test is drawn to the fact that fire testing may be hazardous, and there is a possibility

that toxic and/or harmful smoke and gases may be involved during the test. Mechanical and

operational hazards may also arise during the construction of the test elements or structures,

their testing and disposal of test residues.

An assessment of all potential hazards and risks to health should be made, and safety precautions

should be identified and provided. Written safety instructions should be issued. Appropriate

training should be given to relevant personnel. Laboratory personnel should ensure that they

follow written safety instructions at all times.
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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
1 Scope

This document specifies a method for determining the fire resistance of horizontal service ducts and

vertical service shafts, which pass through walls or floors and enclose pipes and cables, to classify them

according to EN 13501-2. The test scenario examines the behaviour of ducts and shafts exposed to fire

either from outside or from inside the system. This document is intended to be read in conjunction with

EN 1363-1.

This document does not examine the risk of fire spread as a result of thermal conduction along the piping

or cabling installed in service ducts or shafts or thermal conduction through the media these pipes carry.

It does not cover the risk of damage produced by thermal elongation or shortening of tubes and cables as

a result of fire or damaged pipe suspensions. This document does not give guidance on how to test one,

two or three sided service ducts or shafts.

NOTE Guidance on testing service ducts and shafts of less than four sides will be covered in the extended field

of application rules being developed by CEN/TC 127.

This test can be used for systems with boards and also for such systems with continuous covering with

intumescent materials on the boards. It cannot be used for systems where intumescent material is only

applied in the range of the penetration.

This test is unsuitable for evaluating service ducts or shafts with internal barriers at walls and floors.

This test is unsuitable for evaluating fire protective systems for cable systems and associated components

with maintenance of integrity in case of fire. This is covered by EN 1366-11: Fire protective systems for

cable systems and associated components - Part 11: Fire protective systems for cable systems and

associated components.

Whilst the walls of service ducts or shafts tested to this method may provide specified levels of integrity

or insulation, testing according this document does not replace the testing of the functional endurance of

small electrical cables which is covered in EN 50200.

Fire resistance testing of ducts for air distribution systems is covered in EN 1366-1.

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 1363-1:2020, Fire resistance tests — Part 1: General requirements

EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification

using data from fire resistance tests, excluding ventilation services

EN ISO 898-1:2013, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts,

screws and studs with specified property classes — Coarse thread and fine pitch thread (ISO 898-1:2009)

EN ISO 13943, Fire safety — Vocabulary (ISO 13943)
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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1363-1, EN ISO 13943 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
service duct

mainly horizontal duct enclosing combustible or non-combustible services, such as pipes or cables

3.2
service shaft

mainly vertical shaft enclosing combustible or non-combustible services, such as pipes or cables

3.3
shutter of access opening

openable door or panel allowing for access to the services within the duct or shaft

3.4
supporting construction
wall, partition or floor which the duct or the shaft passes through in the test
3.5
board

rigid product of cross section in which the thickness is uniform and substantially smaller than the other

dimensions of the installations
4 Test equipment
4.1 General

In addition to the test equipment specified in EN 1363-1, the following are required.

4.2 Furnace

The furnace shall be capable of subjecting service ducts and shafts to the standard heating and pressure

conditions specified in EN 1363-1 and be suitable for testing horizontal ducts (see Figures 1 and 2) or

vertical shafts (see Figures 3 and 4).
4.3 Loading equipment

Continuous stranded steel cables and/or the installations used in practice are used to apply load to the

service duct or shaft to represent service loading.
4.4 Gas extraction equipment (optional)

If for safety reasons a laboratory requires to extract gases away from the open end of the duct or shaft,

this shall not influence the test conditions.
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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
5 Test conditions
5.1 Furnace

The heating and pressure conditions and the furnace atmosphere shall conform to those given in

EN 1363-1.
5.2 Loading

Horizontal service ducts shall be loaded when supporting service installations. In this case, the weight of

the load shall be representative of that used in practice.

Vertical service shafts shall not be loaded except in the two following situations:

— when supporting service installations. In this case, the weight of the load shall be representative of

that used in practice;

— when the service installation shaft is not supported on each floor or when the height between two

supports is greater than 5 m. In this case a weight load representative for the additional shaft weight

shall be added to the shaft top.
6 Test specimen
6.1 Size
6.1.1 General
Any cross section of duct or shaft may be tested as required by the sponsor.
6.1.2 Length

The minimum lengths of the parts of the test specimen inside and outside the furnace shall be as given in

Table 1.
Table 1 — Straight length of test specimen
Orientation Length
Inside furnace Outside furnace
fire outside fire inside fire outside fire inside
Horizontal duct ≥ 4,0 0,25 ± 0,05 2,0 ± 0,05 2,5 ± 0,05
a ≥ 2,0 0,25 ± 0,05 2,0 ± 0,05 2,0 ± 0,05
Vertical shaft
See also 5.2.
6.1.3 Cross-section

The service ducts and shafts of the same construction type shall be tested with the maximum width and

height and the minimum thickness as intended in practice.
6.2 Number

One test specimen shall be tested for each type of orientation, exposure conditions and cross-section.

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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
6.3 Design
6.3.1 General

The test shall be made on a test specimen, representative of the complete service duct or shaft assembly.

6.3.2 Duct and shaft arrangement
6.3.2.1 General

The exposure condition (fire inside or fire outside) shall be as specified by the sponsor. Ducts shall be

arranged as shown in Figures 1 or 2 and shafts shall be arranged as shown in Figures 3 or 4. Service ducts

or shafts with fire exposure from outside will have no openings in the furnace (except access panels and

service outlets). For service ducts or shafts exposed to an internal fire, the end of the service duct or shaft

facing into the furnace shall be left open. No service ducts or service shafts shall contain anything other

than the loading defined in 4.3.

If a service outlet is part of the system this service outlet shall be tested with a distance to the penetration

through the wall or floor not lower than intended in practice.

Where used in practice, each service duct or shaft shall incorporate one access opening as follows:

— fire outside: inside furnace at mid-span of two suspensions;

— fire inside: as shown in Figure 2 (the dimensions may be applied also to vertical shafts).

For the test, the access opening shall be at the bottom of the duct except the access opening is in practice

only on a side or on the top. In this case the access opening shall be installed as in practice. The width and

height of the access opening shall be representative of the maximum dimensions used in practice, the

thickness shall be the minimum dimension used in practice.

Vertical shafts shall be arranged as shown in Figures 3 or 4 and shall penetrate through the furnace roof

slab/supporting construction. The shafts shall be supported at the furnace roof level as they would be

supported in practice when penetrating a floor (as specified by the sponsor).
6.3.2.2 Joints in horizontal service ducts

For the fire test with fire from outside the test configuration shall include at least one joint inside and at

least one joint outside the furnace. There shall be at least one joint for every layer, both inside and outside

the furnace.

For the fire test with fire from inside these rules only apply for the part of the specimen outside the

furnace.

Outside the furnace, the joint in the outer layer of the fire protection material shall be recorded and it

may be not nearer than 100 mm to thermocouples T2 in accordance with 9.1. Inside the furnace, the joint

in the outer layer of fire protection material shall be located at approximately mid-span. The location of

joints in inner layers shall be as specified by the sponsor.

The distance between joints and suspension devices shall not be less than that used in practice. If the

minimum distance has not been specified, suspension devices shall be arranged so that the joint at mid-

span lies midway between them. Distances between the suspension devices shall be specified by the

sponsor and shall be representative of practice.
6.3.2.3 Joints in vertical service shafts

For the vertical shaft exposed to fire from inside, the test configuration shall include at least one joint

outside the furnace. There shall be at least one joint for every layer.
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SIST EN 1366-5:2021
EN 1366-5:2021 (E)

For the vertical shaft exposed to fire from outside, the test arrangement shall include at least one joint

inside and one joint outside the furnace. There shall be at least one joint both inside and outside the

furnace in every layer of fire protection material.

For fire from inside and for fire from outside: outside the furnace, the joint in the outer layer of the fire

protection material shall be recorded and it may be not nearer than 100 mm to thermocouples T2 in

accordance with 9.1. For fire from outside inside the furnace the joint in the outer layer of fire protection

material shall be located at approximately mid-span. The location of joints in inner layers shall be as

specified by the sponsor.

For multi-layer systems, the location of joints on the inner layer shall be specified by the sponsor.

7 Installation of test specimen
7.1 General

The sealing between the supporting construction and the duct or the shaft shall be as intended in practice.

If the width of the gap around the duct or shaft at the furnace penetration point is not specified, a width

of 50 mm shall be used.

Where the duct or shaft passes through an opening in the furnace wall or roof, then the opening shall be

of sufficient dimensions to allow for the supporting construction to surround all faces of the duct or shaft

by at least 200 mm from the duct/shaft or the outer edge of any fire stopping.

The minimum size of a partition wall as supporting construction for a duct shall be width x height

1,20 m x 2,50 m. The partition wall shall be fixed in the furnace opening only on the top and the bottom

of the wall, but not on the sides.

Parts of the ducts or shafts within the furnace shall be exposed to fire from all sides over their whole

length. Where vertical shafts are not in practice to be fixed to each floor, then the mass of shafts above

shall be reproduced in the test. The simulated height and the mass represented during the test shall be

stated in the test report.

There shall be a clearance of at least 500 mm between the top of the horizontal duct and the ceiling, and

also at least 500 mm between the underside of the horizontal duct and the floor. Similarly, there shall be

a clearance of at least 500 mm between the sides of ducts or shafts and furnace walls. At the furnace wall

remote from the penetration point there may be no gap between the duct tested with fire from outside

and the furnace wall.

The test specimen shall be installed in a manner representative of its use and practice. For the test the

loading occurring in practice by cables, pipes and cable trays (if not included in the test specimen) shall

be taken into account by stranded steel cables as replacement.

Apply the loading equipment along the complete length of the bottom, inside face of each horizontal

service duct to represent a uniformly distributed load. The minimum load (f) shall be:

f = 20 ×
1000
where
f is the load in kilograms per metre (kg/m);
W is the width of service duct in millimetres (mm).

To ensure uniform loading, a minimum of three cables uniformly distributed across the width shall be

used. For ducts with a height lower or equal 100 mm the depth of the cables shall not exceed 50 % of the

height (a 30 mm diameter stranded steel cable has a mass of approximately 3,8 kg/m).

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SIST EN 1366-5:2021
EN 1366-5:2021 (E)
7.2 Standard supporting construction
Where the type of supporting construction to be used in p
...

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