Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications - Part 2-4: Sealed dome fibre splice closures for category S & A

This specification contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements of a fully installed splice closure in order for it to be categorised as an EN standard product.

LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen - Produktnormen - Teil 2-4: LWL-Muffen Bauart 1 mit abgedichteter Haube für die Kategorien S und A

1.1 Produktdefinition Dieses Dokument enthält die Anfangs- und Maßanforderungen zu Beginn der Lebensdauer sowie die optischen, mechanischen und umweltbezogenen Betriebsverhaltensanforderungen an eine vollständig installierte Spleißmuffe, damit sie als ein europäisches Normprodukt eingestuft werden kann. 1.2 Betriebsumgebung Die ausgewählten Prüfungen in Kombination mit der Prüfschärfe und der Dauer sind repräsentativ für eine Außenanlage mit unterirdischer und/oder Luftumgebungen, die definiert sind in: EN IEC 61753-1:2018 Kategorie S: unterirdische Umgebung Kategorie A: Umgebung in Luft 1.3 Zuverlässigkeit Die erwartete Betriebslebensdauer des Produkts in dieser Umgebung beträgt 20 Jahre, wobei die Einhaltung dieser Norm die Zuverlässigkeit des Produktes nicht sichergestellt. Diese sollte unter Verwendung eines anerkannten Programms zur Bewertung der Zuverlässigkeit vorausgesagt werden. 1.4 Qualitätssicherung Die Einhaltung dieser Norm stellt nicht die Gleichmäßigkeit bei der Fertigung des Produktes sicher. Diese sollte unter Verwendung eines anerkannten Qualitätssicherungsprogramms aufrechterhalten werden. 1.5 Zulässige Faser- und Kabeltypen Obwohl die Prüfungen der Gebrauchseigenschaften an Prüflingen mit nicht dispersionsverschobener Faser nach EN 60793-2-50, B1.3 (siehe Anhang A) durchgeführt wird, ist die einmal nach dieser europäischen Norm geprüfte Muffe auch für andere Fasertypen geeignet, z. B. für nulldispersionsverschobene, nichtnulldispersionsverschobene sowie für Mehrmodenfasern. Diese Muffennorm ermöglicht sowohl die Verwendung von Einmoden- als auch Mehrmoden-Lichtwellenleitern und deckt die Lichtwellenleiterkabel aller IEC-Normen mit ihren unterschiedlichen LWL-Aufnahmekapazitäten, Kabeltypen und -Ausführungen ab. Dies schließt unter anderem die Normen für LWL-Kabel EN 60794-2 (Innenkabel) und EN 60794-3 (Außenkabel) ein.

Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par fibres optiques - Spécifications de produits - Partie 2-4: Boîtiers à épissure de fibres sous dôme scellés Type 1, pour catégories S & A

1.1 Définition du produit Le présent document contient les exigences de performances initiales, de début de vie, dimensionnelles, optiques, mécaniques et environnementales d’un boîtier à épissure entièrement installé, afin d’être classé comme produit couvert par une Norme européenne. 1.2 Environnement de fonctionnement Les essais choisis, combinés avec les sévérités et les durées, sont représentatifs d’une installation extérieure pour les environnements souterrains et/ou aériens définis par les normes suivantes: EN IEC 61753 1 catégorie S: environnement souterrain catégorie A: environnement aérien 1.3 Fiabilité Bien que l’espérance de vie en service prévue du produit dans cet environnement soit de 20 ans, la conformité à cette spécification ne garantit pas la fiabilité du produit. Celle-ci est estimée en utilisant un programme reconnu d’évaluation de la fiabilité. 1.4 Assurance de la qualité La conformité à la présente spécification ne garantit pas la cohérence de fabrication du produit. Elle est maintenue en utilisant un programme reconnu d’assurance qualité. 1.5 Types de fibres et câbles autorisés La présente norme de boîtier permet d’utiliser tant la fibre unimodale que la fibre multimodale et couvre tous les câbles à fibres optiques des normes IEC avec leurs différents types, capacités et conceptions de fibres. Cela inclut notamment les normes de câbles à fibres optiques EN 60794 2 (intérieurs), EN 60794 3 (extérieurs). Les essais de performance optique sont effectués sur des échantillons d’essais avec des fibres unimodales selon l’EN IEC 60793 2 50 (voir Annexe A). Le type de fibre choisi pour les échantillons d’essais optiques dépend de la conception du système de gestion des fibres.

Sistemi za upravljanje z optičnimi vlakni in zaščitna ohišja za optične komunikacijske sisteme - Specifikacije proizvoda - 2-4. del: Okrovi optičnih spojnic z zatesnjenimi pokrovi za kategorijo S&A

General Information

Status
Published
Public Enquiry End Date
31-Dec-2018
Publication Date
12-Dec-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-Dec-2021
Due Date
14-Feb-2022
Completion Date
13-Dec-2021

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 50411-2-4:2022
01-februar-2022
Nadomešča:
SIST EN 50411-2-4:2012
Sistemi za upravljanje z optičnimi vlakni in zaščitna ohišja za optične
komunikacijske sisteme - Specifikacije proizvoda - 2-4. del: Okrovi optičnih
spojnic z zatesnjenimi pokrovi za kategorijo S&A
Fibre management systems and protective housings to be used in optical fibre

communication systems - Product specifications - Part 2-4: Sealed dome fibre splice

closures for category S & A
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen
- Produktnormen - Teil 2-4: LWL-Muffen Bauart 1 mit abgedichteter Haube für die
Kategorien S und A

Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par

fibres optiques - Spécifications de produits - Partie 2-4: Boîtiers à épissure de fibres sous

dôme scellés Type 1, pour catégories S & A
Ta slovenski standard je istoveten z: EN 50411-2-4:2021
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
SIST EN 50411-2-4:2022 en

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

---------------------- Page: 1 ----------------------
SIST EN 50411-2-4:2022
---------------------- Page: 2 ----------------------
SIST EN 50411-2-4:2022
EUROPEAN STANDARD EN 50411-2-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2021
ICS 33.180.20 Supersedes EN 50411-2-4:2012 and all of its
amendments and corrigenda (if any)
English Version
Fibre management systems and protective housings to be used
in optical fibre communication systems - Product specifications -
Part 2-4: Sealed dome fibre splice closures for category S & A

Organiseurs et boîtiers de fibres à utiliser dans les LWL-Spleißkassetten und -Muffen für die Anwendung in

systèmes de communication par fibres optiques - LWL-Kommunikationssystemen - Produktnormen - Teil 2-4:

Spécifications de produits - Partie 2-4: Boîtiers à épissure LWL-Muffen Bauart 1 mit abgedichteter Haube für die

de fibres sous dôme scellés Type 1, pour catégories S & A Kategorien S und A

This European Standard was approved by CENELEC on 2021-08-09. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50411-2-4:2021 E
---------------------- Page: 3 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
Contents Page

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

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

1.1 Product definition ....................................................................................................................6

1.2 Operating environment ...........................................................................................................6

1.3 Reliability .................................................................................................................................6

1.4 Quality assurance ...................................................................................................................6

1.5 Allowed fibre and cable types .................................................................................................6

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

3 Terms and definitions .....................................................................................................................8

4 Description .................................................................................................................................... 11

4.1 Closure housing ................................................................................................................... 11

4.2 Cable seals .......................................................................................................................... 12

4.3 Fibre management system .................................................................................................. 13

5 General requirements .................................................................................................................. 13

5.1 Materials ............................................................................................................................... 13

5.2 Storage, transportation and packaging ................................................................................ 13

5.3 Installation and intervention ................................................................................................. 13

5.4 Closure overpressure safety ................................................................................................ 14

5.5 Colour and marking .............................................................................................................. 14

6 Variants ......................................................................................................................................... 14

7 Dimensional requirements .......................................................................................................... 18

7.1 Dimensions of closures for Multiple Element and Multiple Ribbon fibres ............................ 18

7.2 Dimensions of closures for Single Circuit, Single Element and Single Ribbon ................... 19

8 Tests .............................................................................................................................................. 20

8.1 Sample size .......................................................................................................................... 20

8.2 Test sample preparation ...................................................................................................... 20

8.3 Test and measurement methods ......................................................................................... 25

8.4 Test sequence ...................................................................................................................... 25

8.5 Pass/fail criteria .................................................................................................................... 25

9 Test report ..................................................................................................................................... 25

10 Performance requirements .......................................................................................................... 26

10.1 Dimensional and marking requirements .............................................................................. 26

10.2 Sealing, optical and visual examination pass/fail criteria ..................................................... 26

10.3 Sealing performance requirements ...................................................................................... 27

10.4 Optical performance requirements ....................................................................................... 32

Annex A (normative) Fibre for test sample details ......................................................................... 36

A.1 Fibre type for test sample ............................................................................................................ 36

Annex B (normative) Sample size and product sourcing requirements ...................................... 38

Annex C (informative) Families of FMS covered in this standard ................................................ 40

---------------------- Page: 4 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)

Annex D (informative) Dimensions of FMS for multiple element and multiple ribbon ............... 43

Annex E (informative) Dimensions of S type FMS for Single Circuit, Single Element and

Single Ribbon ............................................................................................................................... 44

Bibliography ......................................................................................................................................... 46

---------------------- Page: 5 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
European foreword

This document (EN 50411-2-4:2021) has been prepared by CLC/TC 86BXA, “Fibre optic interconnect,

passive and connectorised components”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2022-05-26
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2024-11-26
conflicting with this document have to be
withdrawn

This document supersedes EN 50411-2-4:2012 and all of its amendments and corrigenda (if any).

EN 50411-2-4:2021 includes the following significant technical changes with respect to

EN 50411-2-4:2012:
— reference EN IEC 61756-1 is added;
— terms and definitions are added;
— harmonized general requirements with the EN IEC 61753-111 series;

— the IEC 61753-1:2007 categories A and S tests and test severities are replaced by the

IEC 61753-1:2018 categories A and S tests and test severities;

— maximum single circuit splice capacity of size E closure reduced from 84 splices to 72 splices;

— variant XX (FMS designed for fibre type) added;
— test pressure for category A changed to 20 kPa overpressure;
— reduced loads in cable retention test for small diameter cables and tubes;
— axial compression test of cables is added;
— number of assembly and disassembly cycles reduced to 5 cycles;

— resistance to solvents and contaminating fluids for category S has changed. The duration of the

immersion in diesel became 1 h and the drying time 24 h. Immersion in kerosene is removed;

— duration of the change of temperature reduced to 12 cycles;
— the test “resistance to shot gun blasts” test is removed;
— fibre type B-567 added for test sample.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
---------------------- Page: 6 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)

Fibre management systems and protective housings to be used in optical fibre communication systems –

Product specifications
Part 2–4: Sealed dome fibre splice closures for category S and A
Description Performance
Construction: Sealed dome ended Applications:
Cable seals: Heat activated and or cold applied Optical fibre cable networks

Fibre management: Single Circuit, Single Element, — for underground (EN IEC 61753-1 category S);

Multiple Element and/or
— for aerial (EN IEC 61753-1 category A).
Single/Multiple Ribbon
Related documents:

EN IEC 60793-2-50, Optical fibres – Part 2–50: Product specifications – Sectional specification for class B single-

mode fibres (IEC 60793-2-50)

EN 60794-2, Optical fibre cables – Part 2: Indoor cables – Sectional specification (IEC 60794-2)

EN 60794-3, Optical fibre cables – Part 3: Outdoor cables – Sectional specification (IEC 60794-3)

EN IEC 61753-1, Fibre optic interconnecting devices and passive components - Performance standard – Part 1:

General and guidance (IEC 61753-1)

EN IEC 61756-1, Fibre optic interconnecting devices and passive components - Interface standard for fibre

management systems - Part 1: General and guidance (IEC 61756-1)

EN 61300 series, Fibre optic interconnecting devices and passive components – Basic test and measurement

procedures (IEC 61300 series)

ETSI EN 300 019, Environmental Engineering (EE) - Environmental conditions and environmental tests for

telecommunications equipment
Construction and sizes: Maximum splice capacity depending closure size and
fibre circuit separation level
Size S type FMS M type FMS
Single Single Single Multiple Multiple
Circuit Element Ribbon Element Ribbon
(SC) (SE) (SR) (ME) (MR)
A - - - 72 -
splices
B 12 72 48 96 -
splices splices splices splices
24 144 72 144 -
splices splices splices splices
D 48 288 144 576 -
splices splices splices splices
E 72 216 144 - -
splices splices splices
F 144 432 288 - -
splices splices splices
G 192 624 384 - 288
splices splices splices splices
H 240 864 432 - 1 152
splices splices splices splices
---------------------- Page: 7 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
1 Scope
1.1 Product definition

This document contains the initial, start of life dimensional, optical, mechanical and environmental

performance requirements of a fully installed splice closure in order for it to be categorized as a

European Standard product.
1.2 Operating environment

The tests selected combined with the severity and duration are representative of an outside plant for

subterranean and/or aerial environments defined by:
EN IEC 61753-1 category S: subterranean environment
category A: aerial environment
1.3 Reliability

Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance

with this specification does not guarantee the reliability of the product. This is predicted using a

recognized reliability assessment programme.
1.4 Quality assurance

Compliance with this specification does not guarantee the manufacturing consistency of the product.

This is maintained using a recognized quality assurance programme.
1.5 Allowed fibre and cable types

This closure standard allows both single-mode and multi-mode fibre to be used and covers all IEC

standard optical fibre cables with their various fibre capacities, types and designs. This includes, but is

not limited to, optical fibre cable standards EN 60794-2 (indoor) and EN 60794-3 (outdoor).

The optical performance tests are carried out on test samples with EN IEC 60793-2-50 single-mode

fibre (see Annex A). The selected fibre type for the optical test samples depends on the design of the

fibre management system.
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 60068-2-10, Environmental testing - Part 2-10: Tests - Test J and guidance: Mould growth (IEC

60068-2-10)

EN IEC 60793-2-50, Optical fibres - Part 2-50: Product specifications - Sectional specification for class

B single-mode fibres (IEC 60793-2-50)

EN 61300-1, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 1: General and guidance (IEC 61300-1)

EN 61300-2-1, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-1: Tests - Vibration (sinusoidal) (IEC 61300-2-1)

EN IEC 61300-2-4, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-4: Tests – Fibre or cable retention (IEC 61300-2-4)

---------------------- Page: 8 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)

EN 61300-2-5, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-5: Tests – Torsion (IEC 61300-2-5)

EN 61300-2-9, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-9: Tests – Shock (IEC 61300-2-9)

EN 61300-2-10, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-10: Tests - Crush resistance (IEC 61300-2-10)

EN 61300-2-11, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-11: Tests - Axial compression (IEC 61300-2-11)

EN 61300-2-12, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures — Part 2-12: Tests — Impact (IEC 61300-2-12)

EN 61300-2-22, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-22: Tests - Change of temperature (IEC 61300-2-22)

EN 61300-2-23, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-23: Tests - Sealing for non-pressurized closures of fibre optic devices

(IEC 61300-2-23)

EN 61300-2-26, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-26: Tests - Salt mist (IEC 61300-2-26)

EN 61300-2-33, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-33: Tests - Assembly and disassembly of fibre optic mechanical

splices, fibre management systems and closures (IEC 61300-2-33)

EN 61300-2-34, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-34: Tests - Resistance to solvents and contaminating fluids of

interconnecting components and closures (IEC 61300-2-34)

EN 61300-2-37, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-37: Tests - Cable bending for fibre optic closures (IEC 61300-2-37)

EN 61300-2-38, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-38: Tests - Sealing for pressurized fibre optic closures (IEC 61300-

2-38)

EN 61300-3-1, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 3-1: Examinations and measurements - Visual examination (IEC 61300-

3-1)

EN 61300-3-3, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 3-3: Examinations and measurements - Active monitoring of changes

in attenuation and return loss (IEC 61300-3-3)

EN 61300-3-28, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 3-28: Examinations and measurements - Transient loss (IEC 61300-3-

28)

EN ISO 4892-3, Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV

lamps (ISO 4892-3)
---------------------- Page: 9 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
3 Terms and definitions

For the purposes of this document, the following terms and definitions 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
excursion loss

change in optical attenuation during the slow variations of environmental parameters

Note 1 to entry: Excursion loss is the ± deviation from the original value of the transmitted power at the start of

the test.
3.2
fibre management system
FMS

system to control, protect and store splices, connectors, passive optical components and fibres from

incoming to outgoing cables

Note 1 to entry: A fibre management system is intended for installation within a protective housing.

Note 2 to entry: A fibre management system is often called an “organiser”.
[SOURCE: EN IEC 61756-1]
3.3
fibre splice

permanent or separable joint whose purpose is to couple optical power between two optical fibres,

achieved by either a fusion or a mechanical technique
[SOURCE: IEV 731-05-05, modified]
3.4
intervention

gain access to modify, add, remove or repair fibre circuits, splices, connectors or other components

between the incoming and outgoing cables of an existing closure
3.5
installation

all activities and handling operations to establish and install a protective housing including the cables or

by adding new circuits, splices, connectors and other components
3.6
installation conditions

circumstances that must be fulfilled for an installation, which includes; environmental conditions, size

interface between the closure or enclosure and the fibre management system, optical performance,

additional/special conditions and safety requirements
3.7
live fibre
fibre optical circuit that is carrying an optical signal
[SOURCE: EN IEC 61756-1]
---------------------- Page: 10 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
3.8
multiple element
physical separation level consisting of more than one single element

Note 1 to entry: This separation level implies fibres from multiple cable elements on one splice tray (also called

mass storage) and constitutes the lowest degree of circuit physical separation.
[SOURCE: EN IEC 61756-1]
3.9
multiple ribbon

multiple element consisting of multiple optical fibres (circuits) arranged in ribbons (fibres in parallel)

which are also arranged (for example, in stacks)
[SOURCE: EN IEC 61756-1]
3.10
optical time domain reflectometer
OTDR

device for characterizing an optical fibre whereby an optical pulse is transmitted through the optical fibre

and the optical power of the resulting light scattered and reflected back to the input is measured as a

function of time

Note 1 to entry: Useful in estimating attenuation coefficient for uniform fibres, and identifying and localizing

defects and localized losses.
[SOURCE: IEV 731-07-08]
3.11
protective housings

all indoor and outdoor housings utilised for the storage, distribution or protection of one or more cable

joints or any passive or active telecom equipment

Note 1 to entry: Examples of protective housings: wall boxes, cabinets, cases, optical distribution frame sub

racks, closures or pedestals. A closure can be either a “sealed closure” or a “free breathing closure”.

Note 2 to entry: The protective housing contains a fibre management system.
[SOURCE: EN IEC 61753-1]
3.12
sealed closure

watertight and dust-tight housing that can hold a varying overpressure or underpressure caused by

temperature changes or atmospheric pressure changes

Note 1 to entry: There is no exchange of air with the outside environment when exposed to temperatures over

the specified operating temperature range.

Note 2 to entry: Although often referred to as hermetic sealed closures, humidity can enter the inner closure by

diffusion.

Note 3 to entry: Completely inner filled housings are also considered to be sealed closures.

[SOURCE: EN IEC 61753-1]
---------------------- Page: 11 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
3.13
single circuit

physical fibre separation level where the optical circuit consists of one fibre (single fibre), or more than

one fibre, providing all services for one subscriber

Note 1 to entry: This fibre separation level has the fibre(s) of only one customer on one splice tray. It is the highest

(best) degree of physical circuit separation.
[SOURCE: EN IEC 61756-1]
3.14
single element

physical separation level with a cable subassembly comprising one or more optical fibres inside a

common covering e.g. a tube or inside one groove of a grooved cable (slotted core cable)

Note 1 to entry: A single element provides more than one termination or circuit.
Note 2 to entry: A fibre ribbon is a single element.

Note 3 to entry: This fibre separation level has all fibres from a cable element (e.g. loose tube) on one splice tray.

It is an intermediate degree of physical circuit separation (between single circuit and multiple element).

[SOURCE: EN IEC 61756-1]
3.15
single ribbon
single element designed to carry all fibres of one ribbon

Note 1 to entry: Depending on the fibres deployment’, a single ribbon can contain all the fibres of one circuit

(single circuit) or the fibres of more than one circuit (single element).
[SOURCE: EN IEC 61756-1]
3.16
splice tray

structure that organises and controls storage of fibre splices in an orderly manner, together with the

associated excess uncabled fibre length
Note 1 to entry: It can be a part of a fibre management system.
[SOURCE: EN IEC 61756-1]
3.17
transient loss

short term (ms) reversible change of optical transmission characteristics arising from optical

discontinuity, physical defects and modifications of the attenuation (e.g. bending loss) normally caused

by mechanical stress
[SOURCE: EN 61300-3-28]
---------------------- Page: 12 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
3.18
uncut fibre

fibres from a continuous cable with the cable sheath removed over a defined length without cutting the

fibres or tubes

Note 1 to entry: The uncut tubes or fibres are stored e.g. in a space saving loop. When required, the fibres are cut

and spliced or connected.
[SOURCE: EN IEC 61756-1]
4 Description
4.1 Closure housing

An optical fibre closure comprises a sealed closure housing that is attached to the ends of the joined

cable sheaths and a fibre management system for containing and protecting the fibres, splices and other

passive optical devices.

This is not to be confused with an optical fibre closure for blowing cable or fibre. This comprises a

protective housing that allows the interconnection of cable ducts or tubes and is attached to the ends of

the ducts or cables containing empty tubes. However, this document shall be used when air blown fibres

are spliced inside this type of closure.

The design of the closure housing shall allow the jointing of two or more cable ends in the following

configurations or applications:

— Track joint configuration (see Figure 1) used to interconnect at least two cables (example: drop

cable repair closure);
Key
1 cable
2 closure
Figure 1 — Track joint configuration

— Spur joint configuration (see Figure 2) used to split one cable into at least 2 smaller cables;

---------------------- Page: 13 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
Key
1 cable
2 closure
Figure 2 — Spur joint configuration

— Distribution joint configuration (see Figure 3) used on customer feed cable with minimum of 6

cable entries (D1), 10 cable entries (D2), 18 cable entries (D3), 34 cable entries (D4) or 66 cable

entries (D5).
Key
1 cable
2 closure
3 uncut fibres
4 drop cable(s)
Figure 3 — Distribution joint configuration

The design of the distribution and spur joint closure housing shall allow the joining together of at least

one pair of cables which are not at the end of a cable section, without cutting all fibres between both

cable openings. This application is generally known as distribution joint or external node, but also called

a mid-span closure or balloon splice.

It is desirable that the closure can be re-opened when necessary without interruption or disturbance of

the traffic of the live circuits.
4.2 Cable seals
Cable entry seal systems can be either, but not limed to:

— Dedicated heat activated heat source, for example, electrical, infrared, hot air or flame

— thermo-shrinkable materials;
— hot melt adhesives;
— polyethylene injection welding.
---------------------- Page: 14 ----------------------
SIST EN 50411-2-4:2022
EN 50411-2-4:2021 (E)
— Dedicated cold applied
— mastic, tapes, pastes, potting compounds, gels and cold adhesives;
— o-rings, grommets, rubber shapes, pre-expanded tubing are cold processes.
— Combined heat activated and cold applied.
4.3 Fibre management system

The splice closure contains a fibre management system as described in EN IEC 61756-1. The fibre

management system provides means for routing, storing and protecting of fibre splices or other passive

optical devices in a predetermined order, between one cable sheath opening to another.

Fibres may be separated to an appropriate separation level SC, SE, SR, ME or MR. This will limit the

risk of interruption to traffic in those fibres belonging to other groups of circuits.

NOTE The families of fibre management systems covered in this document are listed in Annex C.

5 General requirements
5.1 Materials

All materials that are likely to come in contact with personnel shall meet appropriate health and safety

regulations.
Closure and sealing materials sha
...

SLOVENSKI STANDARD
oSIST prEN 50411-2-4:2018
01-december-2018
6LVWHPL]DXSUDYOMDQMH]RSWLþQLPLYODNQLLQ]DãþLWQDRKLãMD]DRSWLþQH
NRPXQLNDFLMVNHVLVWHPH6SHFLILNDFLMHSURL]YRGDGHO2NURYLRSWLþQLK
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Fibre management systems and protective housings to be used in optical fibre

communication systems - Product specifications - Part 2-4: Sealed dome fibre splice

closures for category S & A
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen
- Produktnormen - Teil 2-4: LWL-Muffen Bauart 1 mit abgedichteter Haube für die
Kategorien S und A

Organiseurs et boîtiers de fibres à utiliser dans les systèmes de communication par

fibres optiques - Spécifications de produits - Partie 2-4: Boîtiers à épissure de fibres sous

dôme scellés Type 1, pour catégories S & A
Ta slovenski standard je istoveten z: prEN 50411-2-4:2018
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
oSIST prEN 50411-2-4:2018 en

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

---------------------- Page: 1 ----------------------
oSIST prEN 50411-2-4:2018
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oSIST prEN 50411-2-4:2018
EUROPEAN STANDARD DRAFT
prEN 50411-2-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2018
ICS 33.180.20 Will supersede EN 50411-2-4:2012
English Version
Fibre management systems and protective housings to be used
in optical fibre communication systems - Product specifications -
Part 2-4: Sealed dome fibre splice closures for category S & A

Organiseurs et boîtiers de fibres à utiliser dans les LWL-Spleißkassetten und -Muffen für die Anwendung in

systèmes de communication par fibres optiques - LWL-Kommunikationssystemen - Produktnormen - Teil 2-4:

Spécifications de produits - Partie 2-4: Boîtiers à épissure LWL-Muffen Bauart 1 mit abgedichteter Haube für die

de fibres sous dôme scellés Type 1, pour catégories S & A Kategorien S und A
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2019-01-04.
It has been drawn up by CLC/TC 86BXA.

If this draft becomes a European Standard, CENELEC 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 CENELEC in three official versions (English, French, German).

A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to

the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the 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 Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Project: 66595 Ref. No. prEN 50411-2-4:2018 E
---------------------- Page: 3 ----------------------
oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)
Contents

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

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

1.1 Product definition ....................................................................................................................6

1.2 Operating environment ...........................................................................................................6

1.3 Reliability .................................................................................................................................6

1.4 Quality assurance ...................................................................................................................6

1.5 Allowed fibre and cable types .................................................................................................6

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

3 Terms and definitions .....................................................................................................................8

4 Description .................................................................................................................................... 10

4.1 Closure housing ................................................................................................................... 10

4.2 Closure overpressure safety ................................................................................................ 11

4.3 Cable seals .......................................................................................................................... 11

4.4 Fibre management system .................................................................................................. 11

4.5 Materials ............................................................................................................................... 12

4.6 Colour and marking .............................................................................................................. 12

5 Variants ......................................................................................................................................... 12

6 Dimensional requirements .......................................................................................................... 16

6.1 Dimensions of closures for Multiple Element and Multiple Ribbon fibres ............................ 16

6.2 Dimensions of closures for Single Circuit, Single Element and Single Ribbon ................... 17

7 Tests .............................................................................................................................................. 18

7.1 Sample size .......................................................................................................................... 18

7.2 Test sample preparation ...................................................................................................... 18

7.3 Test and measurement methods ......................................................................................... 20

7.4 Test sequence ...................................................................................................................... 20

7.5 Pass/fail criteria .................................................................................................................... 20

8 Test report ..................................................................................................................................... 20

9 Performance requirements .......................................................................................................... 20

9.1 Dimensional and marking requirements .............................................................................. 20

9.2 Sealing, optical and visual appearance performance criteria .............................................. 21

9.3 Mechanical sealing performance requirements ................................................................... 23

9.4 Environmental sealing performance requirements .............................................................. 26

9.5 Mechanical optical performance requirements .................................................................... 28

9.6 Environmental optical performance requirements ............................................................... 30

Annex A (normative) Fibre for test sample details ......................................................................... 31

Annex B (normative) Sample size and product sourcing requirements ...................................... 32

Annex C (informative) Families of FMS covered in this standard ................................................. 34

Annex D (informative) Dimensions of FMS for multiple element and multiple ribbon ............... 36

Annex E (informative) Dimensions of S type FMS for Single Circuit, Single Element and

Single Ribbon ............................................................................................................................... 37

Bibliography ......................................................................................................................................... 39

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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)

Figure 1 – Track joint configuration .................................................................................................. 10

Figure 2 – Spur joint configuration .................................................................................................... 10

Figure 3 – Distribution joint configuration ........................................................................................ 10

Figure 4 ― Outline dimensions of M closure ................................................................................... 16

Figure 5 ― Outline dimensions of the S closures ........................................................................... 17

Figure 6 ― Track joint configuration sample ................................................................................... 19

Figure 7 ― Distribution joint configuration sample ........................................................................ 19

Figure D.1 ― Outline dimensions of the M type FMS ...................................................................... 36

Figure E.1 ― Outline dimensions of the S type FMS ....................................................................... 37

Table 1 ― Sealed dome fibre splice closure Type 1, for category S - Variants

EN 50411-2-4 – X – XX – X – XX – XX – X ........................................................................... 12

1 2 3 4 5 6

Table 1a ― SC splice tray and closure selection ............................................................................. 13

Table 1b ― SE splice tray and closure selection ............................................................................. 14

Table 1c ― SR splice tray and closure selection ............................................................................. 14

Table 1d ― ME splice tray and closure selection ............................................................................ 15

Table 1e ― MR splice tray and closure selection ............................................................................ 15

Table 2 ― M closure dimensions ....................................................................................................... 17

Table 3 ― S closure with SC, SE and SR splice trays ..................................................................... 18

Table 4 ― Sealing, optical and visual appearance performance criteria ...................................... 21

Table 5 ― Mechanical sealing performance requirements ............................................................. 23

Table 6 ― Environmental sealing performance requirements ....................................................... 26

Table 7 ― Mechanical optical performance requirements .............................................................. 28

Table 8 ― Environmental optical performance requirements ........................................................ 30

Table A.1 ― Fibre characteristics ...................................................................................................... 31

Table B.1 ― Minimum sample size requirements ............................................................................ 32

Table D.1 ― M type FMS – Multiple element and multiple ribbon fibre ......................................... 36

Table E.1 ― S type FMS – SC, SE and SR tray dimensions ............................................................ 38

Table E.2 ― Closures with S type FMS ............................................................................................. 38

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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)
European foreword

This document (prEN 50411-2-4:2018) has been prepared by CLC/TC 86BXA, “Fibre optic

interconnect, passive and connectorised components”.
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 12 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
This document will supersede EN 50411-2-4:2012.

prEN 50411-2-4:2018 includes the following significant technical changes with respect to

EN 50411-2-4:2012:
— terms and definitions are added;

— the IEC 61753-1:2007 categories A and S tests and test severities are replaced by the

IEC 61753-1:201X categories A and S tests and test severities;

— maximum single circuit splice capacity of size E closure reduced from 84 splices to 72 splices;

— addition of new test severity of cable retention load for (microduct) tubes and cables without

strength members: Load (N) = 10 * Øcable (mm);
— the test “resistance to shot gun blasts” test is removed.
To be published.
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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)

Fibre management systems and protective housings to be used in optical fibre communication systems –

Product specifications
Part 2–4: Sealed dome fibre splice closures for category S and A
Description Performance
Construction: Sealed dome ended Applications:
Cable seals: Heat activated and or cold Optical fibre cable networks
applied
- for underground (IEC 61753-1:201X category S);
Fibre management: Single Circuit, Single Element,
- for aerial (IEC 61753-1:201X category A).
Multiple Element and/or
Single/Multiple Ribbon
Related documents:

EN 60793-2-50 Optical fibres – Part 2–50: Product specifications – Sectional specification for class B single-

mode fibres (IEC 60793-2-50)

EN 60794-2 Optical fibre cables – Part 2: Indoor cables – Sectional specification (IEC 60794-2)

EN 60794-3 Optical fibre cables – Part 3: Sectional specification – Outdoor cables (IEC 60794-3)

EN IEC 61753-1:201X Fibre optic interconnecting devices and passive components performance standard – Part

1: General and guidance for performance standard (IEC 61753-1:201X)

EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and measurement

procedures (IEC 61300 series)

ETS 300 019 Environmental Engineering (EE) - Environmental conditions and environmental tests for

telecommunications equipment
Construction and sizes: Maximum splice capacity depending closure size and
fibre circuit separation level
Size S type FMS M type FMS
Single Single Single Multiple Multiple
Circuit Element Ribbon Element Ribbon
(SC) (SE) (SR) (ME) (MR)
A - - - 72 -
splices
B 12 72 48 96 -
splices splices splices splices
C 24 144 72 144 -
splices splices splices splices
48 288 144 576 -
splices splices splices splices
E 72 216 144 - -
splices splices splices
F 144 432 288 - -
splices splices splices
G 192 624 384 - 288
splices splices splices splices
H 240 864 432 - 1 152
splices splices splices splices
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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)
1 Scope
1.1 Product definition

This document contains the initial, start of life dimensional, optical, mechanical and environmental

performance requirements of a fully installed splice closure in order for it to be categorized as a

European Standard product.
1.2 Operating environment

The tests selected combined with the severity and duration are representative of an outside plant for

subterranean and/or aerial environments defined by:
EN IEC 61753-1:201X category S: subterranean environment
category A: aerial environment
1.3 Reliability

Whilst the anticipated service life expectancy of the product in this environment is 20 years,

compliance with this specification does not guarantee the reliability of the product. This should be

predicted using a recognized reliability assessment programme.
1.4 Quality assurance

Compliance with this specification does not guarantee the manufacturing consistency of the product.

This should be maintained using a recognized quality assurance programme.
1.5 Allowed fibre and cable types

Although the optical performance tests are carried out on test samples with EN 60793-2-50, B1.3

dispersion unshifted single mode fibre (see Annex A), the closure, once tested according to this

European Standard, will also be suitable for other fibre types, e.g. dispersion shifted, non-zero

dispersion shifted and multi-mode fibres.

This closure standard allows both single mode and multimode fibre to be used and covers all IEC

standard optical fibre cables with their various fibre capacities, types and designs. This includes, but is

not limited to, optical fibre cable standards EN 60794-2 (indoor) and EN 60794-3 (outdoor).

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 60793-2-50, Optical fibres — Part 2-50: Product specifications — Sectional specification for class

B single-mode fibres (IEC 60793-2-50)

EN 60794-2, Optical fibre cables - Part 2: Indoor cables - Sectional specification (IEC 60794-2)

EN 60794-3, Optical fibre cables - Part 3: Sectional specification - Outdoor cables

EN 61300-2-1, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-1: Tests - Vibration (sinusoidal)

EN 61300-2-4, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-4: Tests - Fibre/cable retention
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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)

EN 61300-2-5, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-5: Tests - Torsion

EN 61300-2-9, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-9: Tests - Shock

EN 61300-2-10, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-10: Tests - Crush resistance

EN 61300-2-11, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-11: Tests - Axial compression

EN 61300-2-12, Fibre optic interconnecting devices and passive components — Basic test and

measurement procedures — Part 2-12: Tests — Impact (IEC 61300-2-12)

EN 61300-2-22, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-22: Tests - Change of temperature

EN 61300-2-23, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-23: Tests - Sealing for non-pressurized closures of fibre optic

devices

EN 61300-2-26, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-26: Tests - Salt mist

EN 61300-2-33, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-33: Tests - Assembly and disassembly of fibre optic mechanical

splices, fibre management systems and closures

EN 61300-2-34, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-34: Tests - Resistance to solvents and contaminating fluids of

interconnecting components and closures

EN 61300-2-37, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-37: Tests - Cable bending for fibre optic closures

EN 61300-2-38, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 2-38: Tests - Sealing for pressurized fibre optic closures

EN 61300-3-1, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 3-1: Examinations and measurements - Visual examination

EN 61300-3-3, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 3-3: Examinations and measurements - Active monitoring of changes

in attenuation and return loss

EN 61300-3-28, Fibre optic interconnecting devices and passive components - Basic test and

measurement procedures - Part 3-28: Examinations and measurements - Transient loss

EN IEC 61753-1:201X, Fibre optic interconnecting devices and passive components performance

standard – Part 1: General and guidance for performance standards (IEC 61753-1:201X)

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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)
3 Terms and definitions

For the purposes of this document, the following terms and definitions 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 http://www.iso.org/obp
3.1
fibre management system
FMS

system to control, protect and store splices, connectors, passive optical components and fibres from

incoming to outgoing cables

Note 1 to entry: A fibre management system is intended for installation within a protective housing.

Note 2 to entry: A fibre management system is often called an “organiser”.
[SOURCE: EN IEC 61756-1]
3.2
fibre splice

permanent or separable joint whose purpose is to couple optical power between two optical fibres,

achieved by either a fusion or a mechanical technique
[SOURCE: IEV 731-05-05 modified]
3.3
live fibre
fibre optical circuit that is carrying an optical signal
[SOURCE: EN IEC 61756-1]
3.4
multiple element
physical separation level consisting of more than one single element

Note 1 to entry: This separation level implies fibres from multiple cable elements on one splice tray (also called

mass storage) and constitutes the lowest degree of circuit physical separation.
[SOURCE: EN IEC 61756-1]
3.5
multiple ribbon

as opposed to single ribbon, a multiple element consisting of multiple optical fibres (circuits) arranged

in ribbons (fibres in parallel) in turn arranged e.g. in stacks
[SOURCE: EN IEC 61756-1]
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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)
3.6
optical time domain reflectometer
OTDR

device for characterizing an optical fibre whereby an optical pulse is transmitted through the optical

fibre and the optical power of the resulting light scattered and reflected back to the input is measured

as a function of time

Note1 to entry: Useful in estimating attenuation coefficient for uniform fibres, and identifying and localizing defects

and localized losses.
[SOURCE: IEV 731-07-08]
3.7
sealed closure

watertight and dust-tight housing that can hold a varying overpressure or underpressure caused by

temperature changes or atmospheric pressure changes. Complete inner filled housings are also

considered to be sealed closures

Note 1 to entry: There is no exchange of air with the outside environment when exposed to temperatures over the

specified operating temperature range

Note 2 to entry: Although often referred to as hermetic sealed closures, humidity can enter the inner closure by

diffusion
[SOURCE: EN IEC 61753-1]
3.8
single circuit

circuit (fibre) physical separation level where the optical circuit consists of one fibre (single fibre), or

more than one fibre, providing one termination

Note 1 to entry: This separation level foresees only the fibre(s) of one customer per splice tray and constitutes

the highest degree of circuit physical separation.
[SOURCE: EN IEC 61756-1]
3.9
single element

circuit (fibre) physical separation level with a cable subassembly comprising one or more optical fibres

inside a common covering e.g. a tube or inside one groove of a grooved cable (slotted core cable)

Note 1 to entry: A single element provides more than one termination or circuit.
Note 2 to entry: A fibre ribbon is a single element.

Note 3 to entry: This separation level foresees all fibres from a cable element (e.g. a loose tube) per splice tray

and constitutes an intermediate degree of circuit physical separation between single circuit (SC) and multiple

element (ME).
[SOURCE: EN IEC 61756-1]
3.10
single ribbon

single circuit or single element, depending on the fibres’ deployment, designed to carry respectively

one circuit (single circuit) or more circuits (single element)
[SOURCE: EN IEC 61756-1]
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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)
4 Description
4.1 Closure housing

An optical fibre closure comprises a sealed closure housing that is attached to the ends of the joined

cable sheaths and a fibre management system for containing and protecting the fibres, splices and

other passive optical devices.

This is not to be confused with an optical fibre closure for blowing cable or fibre. This comprises a

protective housing that allows the interconnection of cable ducts or tubes and is attached to the ends

of the ducts or cables containing empty tubes. However, this document shall be used when air blown

fibres are spliced inside this type of closure.

The design of the closure housing shall allow the jointing of two or more cable ends in the following

configurations or applications:

(T) Track joint configuration used to interconnect at least two cables (example: drop cable repair

closure)
Figure 1 – Track joint configuration

(S) Spur joint configuration used to split one cable into at least 2 smaller cables.

Figure 2 – Spur joint configuration

(D) Distribution joint configuration used on customer feed cable with minimum of 6 cable entries

(D1), 10 cable entries (D2), 18 cable entries (D3), 34 cable entries (D4) or 66 cable entries (D5).

Figure 3 – Distribution joint configuration
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oSIST prEN 50411-2-4:2018
prEN 50411-2-4:2018 (E)

The design of the distribution and spur joint closure housing shall allow the joining together of at least

one pair of cables which are not at the end of a cable section, without cutting all fibres between both

cable openings. This application is generally known as distribution joint or external node, but also

called a mid-span closure or balloon splice.

It is desirable that the closure can be re-opened when necessary without interruption or disturbance of

the traffic of the live circuits.
4.2 Closure overpressure safety

Overpressure can build up in sealed closures due to temperature differentials, or due to atmospheric

pressure changes over a period of time, or due to flash testing of the seals after installation, or due to

incorrect installation techniques. Care should be taken when opening a sealed closure. Provisions

shall be made that overpressure is exhausted when opening the closure prior to complete removal of

the cover.

For air blown fibre applications an overpressure release system is required for all sealed closures.

4.3 Cable seals
Cable entry seal systems can be either, but not limed to:

(H) Dedicated heat activated heat source, for example, electrical, infrared, hot air or flame

– thermo-shrinkable materials;
– hot melt adhesives;
– polyethylene injection welding.
(R) Dedicated cold applied
– mastic, tapes, pastes, potting compounds, gels and cold adhesives;
– o-rings, grommets, rubber shapes, pre-expanded tubing are cold processes.
(U) Combined heat activated and cold applied

The fibre management closure allows for a physical housing structure that provides for optical cable

fixing, sealing, anchoring, water and gas blocking, storage and routing up to the input and output fibres

of the fibre management system.
4.4 Fibre management system
The fibre management system pro
...

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