prEN 1366-14

• Abstract:

  This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a separating element at the position at which it has been penetrated by a device or devices that passes through one face of the element only. Partial penetration seals are used to seal apertures for electrical sockets, downlighters, media devices, cables and any item which requires an opening to be made in one face of the element of construction but does not include a device which passes through both faces.; Supporting constructions are used in this part of the EN 1366 series to represent separating elements such as walls or floors. The supporting construction shall be a system that has been subject to a fire test in accordance with one of the following standards: EN 13381 1 for horizontal membranes, EN 13381 2 for vertical membranes, EN 1364 1 or EN 1365 1 for walls, EN 1366 3 for walls based on a standard supporting construction, or EN 1364 2 or EN 1365 2 for floors. This is referred to throughout this document as the applicable test standard for the supporting construction.; This part of the EN 1366 series is used in conjunction with EN 1363 1.; The purpose of a test described in this part of the EN 1366 series is to assess the integrity and insulation performance of the partial penetration seal, of the partially penetrating service(s) or device(s) and of the separating element in the surrounding area of the partial penetration seal. Where partial penetration seals are installed in loadbearing elements, it is possible that the loadbearing capacity is also considered.; It is not the intention of this test to provide quantitative information on the rate of leakage of smoke and/or hot gases or on the transmission or generation of fumes.; Tests in accordance with this part of the EN 1366 series are not intended to supply any information on the ability of the partial penetration seal to withstand stress caused by movements or displacements of the penetrating devices.; The risk of spread of fire downwards cannot be assessed with this test.; Tests in accordance with this part of the EN 1366 series do not address any risks associated with leakage of dangerous liquids or gases caused by failure of the device in case of fire.

• Status: Not Published
• Publication Date: 02-Jan-2028
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• ICS: 81.060.10 - Raw materials
• Technical Committee: CEN/TC 127 - Fire safety in buildings
• Drafting Committee: CEN/TC 127/WG 2 - Services
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 02-Jul-2026
• Due Date: 11-Aug-2026
• Completion Date: 02-Jul-2026
• Ref Project: oSIST prEN 1366-14:2026 - Fire resistance tests for service installations - Part 14: Partial penetration seals

Overview

prEN 1366-14: Fire resistance tests for service installations – Part 14: Partial penetration seals is a draft European Standard developed by CEN/TC 127 “Fire safety in buildings.” This part of the EN 1366 series details the testing methodology and assessment criteria for partial penetration seals – specialized systems designed to maintain the fire resistance of separating elements (such as walls or floors) at locations where devices (like electrical sockets, downlighters, media devices, and cables) partially penetrate only one side of the construction.

Partial penetration seals differ from full penetration seals by addressing only connections that do not pass fully through the element. This standard is crucial for ensuring that any necessary openings for building services do not compromise the integrity and insulation performance required for fire safety.

Key Topics

• Scope of Application
  • Applies to seals used for electrical sockets, downlighters, communication/media devices, and cables.
  • Excludes devices that completely penetrate both faces of walls or floors.
  • Mandates the use of supporting constructions that have passed relevant fire resistance tests (e.g., EN 13381-1/2, EN 1364-1/2, EN 1365-1/2).
• Testing Methodology
  • Assesses fire integrity and insulation performance of both the partial penetration seal and surrounding construction.
  • Includes evaluation rules for direct application fields, enabling test results to be extended within defined limits.
  • Specifies thermocouple positioning and measurement procedures for accurate evaluation of temperature rise and fire containment.
• Performance Criteria
  • Integrity is assessed as per EN 1363-1, ensuring no passing flames or hot gases compromise the barrier.
  • Insulation is measured by temperature rise limits, both for individual points and average across test specimens.
  • Loadbearing Capacity is only considered if partial penetration seals are installed in loadbearing elements.
• Limitations
  • Does not provide information on smoke leakage, movement resistance, or failure of devices leading to hazardous gas or liquid leakage.
  • Downward fire spread or device movement due to displacement are beyond the standard’s scope.

Applications

Partial penetration seals tested under prEN 1366-14 are commonly utilized in:

• Commercial and Residential Buildings: Maintaining fire compartmentation where electrical outlets, media devices, or service cables penetrate wall or floor surfaces.
• Healthcare and Data Facilities: Securing service apertures in fire-rated barriers for intensive service requirements, minimizing risk without compromising fire resistance.
• Infrastructure and Public Buildings: Ensuring fire-safety compliance in public places with consistent, standardized fire resistance performance for partially penetrating installations.

Implementation of this standard supports compliance with building regulations, enhances occupant safety, and helps architects, engineers, and installers select and specify suitable passive fire protection products.

Related Standards

When implementing prEN 1366-14, the following standards are frequently referenced or necessary for comprehensive fire resistance assessment:

• EN 1363-1: Fire resistance tests – General requirements (core methodology referenced throughout).
• EN 1363-2: Fire resistance tests – Alternative and additional procedures.
• EN 13381-1/2: Test methods for fire resistance of horizontal and vertical membranes in supporting constructions.
• EN 1364-1/2, EN 1365-1/2: Fire resistance tests for walls and floors, essential for determining baseline performance of supporting elements.
• EN 1366-3: Related to full penetration seals.
• EN ISO 13943: Fire safety vocabulary for terminology consistency.
• EN 60670-1: For specific requirements regarding electrical socket enclosures.

By adhering to prEN 1366-14 in conjunction with these referenced standards, stakeholders ensure rigorous fire safety performance of partial penetration seals as part of passive fire protection strategies in modern construction.

Keywords: prEN 1366-14, fire resistance tests, partial penetration seals, passive fire protection, integrity, insulation, building fire safety, service installations, CEN, EN 1363-1, compartmentation.

SLOVENSKI STANDARD
01-september-2026
Preskusi požarne odpornosti servisnih inštalacij - 14. del: Delne tesnitve prebojev
Fire resistance tests for service installations - Part 14: Partial penetration seals
Feuerwiderstandsprüfungen für Installationen - Teil 14: Partielle Abschottungen
Essais de résistance au feu des installations techniques - Partie 14: Calfeutrements de
trémies partielles
Ta slovenski standard je istoveten z: prEN 1366-14
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
83.140.50 Tesnila Seals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2026
ICS 13.220.50
English Version
Fire resistance tests for service installations - Part 14:
Partial penetration seals
Essais de résistance au feu des installations techniques Feuerwiderstandsprüfungen für Installationen - Teil
- Partie 14: Calfeutrements de trémies partielles 14: Partielle Abschottungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 127.
If this draft becomes a European Standard, 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.

This draft European Standard 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1366-14:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test equipment . 8
5 Test conditions . 8
5.1 Heating conditions . 8
5.2 Pressure conditions . 8
5.3 Loading conditions . 8
6 Test specimen . 8
6.1 Size and distances . 8
6.2 Number of test specimens . 9
7 Installation of test specimen . 9
7.1 General. 9
7.2 Supporting construction . 10
8 Conditioning . 10
9 Application of instrumentation . 10
9.1 General. 10
9.2 Thermocouples . 10
9.2.1 Furnace thermocouples . 10
9.2.2 Unexposed face thermocouples . 10
9.2.3 Roving thermocouple . 12
9.2.4 Additional thermocouples . 12
9.3 Integrity measurement . 12
10 Test procedure . 12
10.1 General. 12
10.2 Installation of test construction . 13
10.3 Measurements and observations . 13
11 Performance criteria . 13
11.1 Insulation . 13
11.1.1 Maximum temperature rise . 13
11.1.2 Average temperature rise . 13
11.2 Integrity . 13
11.3 Loadbearing capacity . 13
11.4 Expression of results . 13
12 Test report . 13
13 Field of direct application of test results . 14
13.1 Orientation . 14
13.2 Supporting construction . 14
13.3 Seal size . 14
13.4 Device depth . 14
13.5 Distances . 14
Annex A (normative) Partial penetration seals for electrical sockets in walls . 15
A.1 Standard configuration . 15
A.2 Direct field of application . 16
Annex B (normative) Partial penetration seals for devices other than electrical sockets in
walls . 18
B.1 Standard configuration . 18
B.2 Direct field of application . 18
Annex C (normative) Partial penetration seals for services in walls . 19
C.1 Standard configuration . 19
C.2 Direct field of application . 20
Annex D (normative) Partial penetration seals in ceilings with loadbearing test. 21
D.1 Standard configuration . 21
Annex E (normative) Partial penetration seals in floors . 22
E.1 Standard configuration . 22
E.2 Direct field of application . 22
Bibliography . 23

European foreword
This document (prEN 1366-14:2026) has been prepared by Technical Committee CEN/TC 127 “Fire
safety in buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
EN 1366 ‘Fire resistance tests for device installations’ consists of the following Parts:
Part 1: Ducts;
Part 2: Fire dampers;
Part 3: Penetration seals;
Part 4: Linear joint seals;
Part 5: Device ducts and shafts;
Part 6: Raised access and hollow core floors;
Part 7: Conveyor systems and their closures;
Part 8: Smoke extraction ducts;
Part 9: Single compartment smoke extraction ducts;
Part 10: Smoke control dampers;
Part 11: Fire protection system for essential devices.

Introduction
This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field
of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a
separating element at the position at which it has been penetrated by a device or devices that passes
through one face of the element only. Partial penetration seals are used to seal apertures for electrical
sockets, downlighters, media devices, cables and any item which requires an opening to be made in one
face of the element of construction but does not include a device which passes through both faces.

1 Scope
This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field
of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a
separating element at the position at which it has been penetrated by a device or devices that passes
through one face of the element only. Partial penetration seals are used to seal apertures for electrical
sockets, downlighters, media devices, cables and any item which requires an opening to be made in one
face of the element of construction but does not include a device which passes through both faces.
Supporting constructions are used in this part of the EN 1366 series to represent separating elements
such as walls or floors. The supporting construction shall be a system that has been subject to a fire test
in accordance with one of the following standards: EN 13381-1 for horizontal membranes, EN 13381-2
for vertical membranes, EN 1364-1 or EN 1365-1 for walls, EN 1366-3 for walls based on a standard
supporting construction, or EN 1364-2 or EN 1365-2 for floors. This is referred to throughout this
document as the applicable test standard for the supporting construction.
This part of the EN 1366 series is used in conjunction with EN 1363-1.
The purpose of a test described in this part of the EN 1366 series is to assess the integrity and
insulation performance of the partial penetration seal, of the partially penetrating service(s) or
device(s) and of the separating element in the surrounding area of the partial penetration seal. Where
partial penetration seals are installed in loadbearing elements, it is possible that the loadbearing
capacity is also considered.
It is not the intention of this test to provide quantitative information on the rate of leakage of smoke
and/or hot gases or on the transmission or generation of fumes.
Tests in accordance with this part of the EN 1366 series are not intended to supply any information on
the ability of the partial penetration seal to withstand stress caused by movements or displacements of
the penetrating devices.
The risk of spread of fire downwards cannot be assessed with this test.
Tests in accordance with this part of the EN 1366 series do not address any risks associated with
leakage of dangerous liquids or gases caused by failure of the device in case of fire.
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, Fire resistance tests — Part 1: General requirements
EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures
EN ISO 13943, Fire safety — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1363-1 and EN ISO 13943 and
the following apply.
3.1
back to back
devices installed on both faces of a vertical construction with a separation distance of 200 mm or less in
any direction (in the plane of the wall)
3.2
device
electrical or mechanical equipment which penetrates one face of the separating element, often at the
termination of a service
EXAMPLE Electrical socket or recessed media equipment.
3.3
flexible construction
horizontal or vertical supporting construction consisting of studs or joists, including linings and
optional insulation
3.4
offset
distance between the centres of two partial penetration seals in opposite faces of the element of
construction
3.5
partial penetration
aperture in one face of the separating element, including any service(s) or device(s) and associated seal,
that does not pass completely through the element
3.5.1
small partial penetration
partial penetration with an area of up to 0,025 m
3.5.2
medium partial penetration
2 2
partial penetration with an area greater than 0,025 m up to 0,12 m
3.5.3
large partial penetration
partial penetration with an area greater than 0,12 m
3.6
partial penetration seal
system used to maintain the fire resistance of a separating element at the position where one or more
services or devices pass through one face of a separating element
Note 1 to entry: These are sometimes referred to as “membrane penetrations”, “one-sided opening closures” or
“seals for one-sided outlets and installed components”.
3.7
separation
distance between the closest extremities of two partial penetration seals in the same face of the element
of construction
3.8
supporting construction
wall or floor construction used to support the partial penetration seal being evaluated
3.9
test specimen
assembly for the fire test consisting of the partial penetrating service(s) or device(s) and the partial
penetration seal materials or partial penetration seal devices
3.10
wall segment
section of a stud wall between adjacent studs
3.11
blank seal
seal is tested without the inclusion of a device for the purpose of generating field of application
EXAMPLE A hollow wall box including cable and blind cover, but without a switch or socket.
4 Test equipment
See EN 1363-1, and if applicable EN 1363-2.
5 Test conditions
5.1 Heating conditions
The heating and furnace atmosphere shall conform to those given in EN 1363-1 or, if applicable,
EN 1363-2.
5.2 Pressure conditions
Pressure conditions including tolerances shall be as given in the applicable test standard for the
supporting construction, subject to the following additional requirements:
Services shall only be included in the zone where the positive pressure exceeds 10 Pa (a minimum
pressure of 10 Pa shall be maintained at the lowest point of the lowest service, see Figure 7).
NOTE A pressure of 10 Pa is expected to be maintained ca. 1 200 mm below the plane where a pressure of
20 Pa is maintained in accordance with the pressure gradient given in EN 1363-1.
For horizontal supporting constructions a nominal pressure of 20 Pa shall be maintained in the
horizontal plane (100 ± 10) mm below the underside of the supporting construction.
5.3 Loading conditions
If the supporting construction is loadbearing, the test specimen shall be subjected to loads determined
in accordance with the applicable test standard for the supporting construction, which will refer back to
EN 1363-1. The determination of the load shall be clearly indicated in the test report.
6 Test specimen
6.1 Size and distances
The dimensions of the test specimen shall be in accordance with the applicable test standard for the
supporting construction.
In order to avoid boundary effects, the distance between the perimeter of the partial penetration seal
and the internal surfaces of the furnace or edges of the supporting construction shall be not less than
200 mm at any point.
Separation of partial penetration seals installed within the same face of a wall construction shall comply
with the following:
a) Partial penetration seals that are intended to be evaluated separately shall be separated by a
minimum 200 mm in any direction in the plane of the wall, unless the separation distance used in
practice is less, in which case the actual separation distance shall be used.
b) Partial penetration seals that are intended to be evaluated with interaction (evaluated for the effect
that other partial penetration seals may have on the performance of any given seal), shall be tested
with a separation of less than 200 mm (in any direction in the plane of the wall), unless the
separation distance used in practice is less. In each case the actual separation distance used shall be
the desired minimum separation.
c) The distances between partial penetration seals shall be recorded in the test report wherever this
is less than 200 mm (horizontally or vertically in the plane of the wall).
Separation of partial penetration seals installed within the opposite faces of a wall construction shall
comply with the following:
a) Partial penetration
...