SIST EN 50411-2:2008

SLOVENSKI STANDARD
01-oktober-2008
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Fibre organisers and closures to be used in optical fibre communication systems -
Product specifications - Part 2: General and guidance for optical fibre cable joint
closures, protected microduct closures, and microduct connectors
LWL-Spleißkassetten und -Muffen für die Anwendung in LWL-Kommunikationssystemen
- Produktnormen - Teil 2: Allgemeines und Leitfaden für LWL-Kabel-Verbindungsmuffen,
geschützte Röhrchenmuffen und Röhrchenverbindungen
Organiseurs et boîtiers de fibres destinés a etre utilisés dans les systemes de
communication par fibres optiques - Spécifications de produits - Partie 2: Généralités et
lignes directrices relatives aux boîtiers communs aux câbles a fibres optiques, aux
boîtiers a microconduits protégés, et aux connecteurs de microconduits
Ta slovenski standard je istoveten z: EN 50411-2:2008
ICS:
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50411-2
NORME EUROPÉENNE
August 2008
EUROPÄISCHE NORM
ICS 33.180.20
English version
Fibre organisers and closures to be used
in optical fibre communication systems -
Product specifications -
Part 2: General and guidance for optical fibre cable joint closures,
protected microduct closures, and microduct connectors

Organiseurs et boîtiers de fibres destinés LWL-Spleißkassetten und -Muffen
à être utilisés dans les systèmes für die Anwendung in
de communication par fibres optiques - LWL-Kommunikationssystemen -
Spécifications de produits - Produktnormen -
Partie 2: Généralités et lignes directrices Teil 2: Allgemeines und Leitfaden
relatives aux boîtiers communs für LWL-Muffen,
aux câbles à fibres optiques, geschützte Mikrorohrmuffen
aux boîtiers à microconduits protégés, und Mikrorohrverbinder
et aux connecteurs de microconduits

This European Standard was approved by CENELEC on 2008-04-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50411-2:2008 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 86BXA, Fibre optic
interconnect, passive and connectorised components.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as
EN 50411-2 on 2008-04-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-04-01
__________
- 3 - EN 50411-2:2008
Fibre organisers and closures to be used in optical fibre communication systems –
Product specifications
Part 2: General and guidance for optical fibre cable joint closures, protected microduct closures,
and microduct connectors
Construction: Applications:
Sealed or non-sealed products covering both
Optical fibre cable networks for underground and/or aerial

a) optical fibre cable splicing FMS or
Non-pressurised
protected microduct closures MCS

or
Sealed closures (only)
b) microduct connectors
EN 61753-1 category; S (subterranean) and A (aerial)

Product specification document options:
Environmental protection requirements:

• temperature extremes;
The closure or connector product specifications
must align with one of the following titles; labelled, • resistance to solvents and contaminating fluids;
EN 50411-2-X: • resistance to water ingress;

• resistance to salt mist.
• sealed dome closures with a FMS;

Mechanical protection requirements:
• sealed pan closures with a FMS;
• vibration;
• sealed inline closures with a FMS;
• closure crush and impact;
• sealed closures for ABF microducts;
• cable entry tension, torsion and bending;
• non-sealed closures for ABF microducts;
• resistance to shotgun fire (aerial only).
• microduct connectors for sealed closures;
• microduct connectors for non-sealed
closures.
Common base configurations:
Closure shape options:
• track joint: configuration used on inline cable, with
• dome, pan, and inline;
minimum of 2 cable entries;
• ‘T’, ‘Y’, and ‘X’.
• spur joint: configuration used on local feeder cable
ABF microduct connector options:

with minimum of 3 cable entries;
• straight;
• distribution joint: configuration used on customer
• straight bulkhead;
feed cable with minimum of 8 cable entries.
• ID reducer/enlarger stem;
• ID reducer/enlarger;
• OD reducer/enlarger stem;
• OD reducer/enlarger;
Fibre Management System options:

• ID and OD reducer/enlarger stem;
SC, SR, SE, ME, MR.
• ID and OD reducer/enlarger;
Optical functionality:
• close down;
Transient losses:
• liquid block;
• liquid block with barb;
≤ 0,5 dB at 1 550 nm and ≤ 1 dB at 1 625 nm per active
• end stop.
circuit during test
Cable seals:
Residual losses:
• heat activated;
≤ 0,1 dB at 1 550 nm and 1 625 nm per active circuit on
• cold applied;
test
• both heat and cold applied.
FMS closure additional requirements:

• future proof – expandable;
• wave length range, 1 260 nm up to
1 650 nm.
Related documents:
EN 61300 series Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures (IEC 61300 series)
EN 61753-1 Fibre optic interconnecting devices and passive components performance standard -
Part 1: General and guidance for performance standards (IEC 61753-1)
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 60794-5 Optical fibre cables - Part 5: Sectional specification - Microduct cabling for installation
by blowing (IEC 60794-5)
ETSI EN 300 019 series Environmental Engineering (EE) - Environmental conditions and environmental tests
for telecommunications equipment

Contents
1 Scope . 6
1.1 Rules and conventions . 6
1.2 Product definition. 6
1.3 Operating environment . 7
1.4 Reliability . 7
1.5 Quality assurance. 7
1.6 Safety . 7
1.7 FMS closure future proof requirement . 7
1.8 Fibre types and cable designs . 7
1.9 FMS to closure interfaces - Informative information . 7
2 Normative references . 8
3 Definitions and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 12
4 Closure options defined … . 12
4.1 Closure with FMS housing functionality . 12
4.2 ABF closure housing functionality . 12
4.3 Closure shape options defined . 13
4.4 Product specification options defined. 13
4.5 Common base options defined . 13
4.6 Cable entry seal options . 13
4.7 Fibre management system options defined . 14
4.8 ABF microduct connector options defined . 14
5 Closure options, geometrical forms and dimensioning requirements . 14
5.1 Dome and pan closure geometrical forms . 14
5.2 Inline closure geometrical form . 14
5.3 Air blown microduct geometrical forms . 15
6 Closure with FMS general functional requirements . 16
6.1 Closure with FMS functional parts . 16
6.2 FMS functional parts . 16
6.3 General functional requirements of a closure with FMS . 17
6.4 General functional requirements of the FMS . 17
6.5 FMS - Functional options housed in closures . 17
6.6 FMS splicing to closure interfaces . 17
6.7 FMS optical fibre connector to closure interfaces . 19
6.8 ABF closure interface - Microduct minimum bend radius . 19
7 Closure with ABF microduct connectors general functional requirements . 19
7.1 Air blown fibre systems . 19
7.2 Future proof closures, functional requirements . 20
7.3 All closure outside profile, dimensional conventions . 20
7.4 All microduct connector outside/bulkhead profile, dimensional conventions . 21
8 General product descriptions . .21
8.1 Materials . 21
8.2 Colour and marking . 21
8.3 Environmental, functional requirements . 22
9 Variants layouts - Closure and microduct connector . 22
10 Tests . 24
10.1 Sealed closure sample size . 24
10.2 Sealed closure with FMS test sample preparation . 24
10.3 Closures with FMS optical test sample construction . 24

- 5 - EN 50411-2:2008
10.4 Closure with FMS test and measurement methods . 25
10.5 Closure with FMS test sequence . 25
10.6 Closure with FMS pass/fail criteria . 25
11 Performance requirements . 26
11.1 Dimensional and marking requirements . 26
11.2 Sealed closure sealing, optical and appearance performance criteria . 26
11.3 Sealed closure environmental and mechanical performance test methods . 27
11.4 Unsealed closure environmental and mechanical performance test methods . 28
11.5 Microduct connector sealing, optical and appearance performance criteria. 29
11.6 Microduct connector - Environment and mechanical performance test methods . 29

Bibliography . 30
Figures
Figure 1 - Dome . 14
Figure 2 - Pan . 14
Figure 3 - Inline closure - End plate type (1a) . 14
Figure 4 - Inline closure - Shell type - Short and fat (2a) . 15
Figure 5 - Inline closure - Shell type - Long and thin (2b) . 15
Figure 6 - Closure Y . 15
Figure 7 - Closure T (single ports) . 15
Figure 8 - Closure T (double ports) . 15
Figure 9 - Closure X . 16
Figure 10 - Closure functional parts diagram . 16
Figure 11 - FMS system functional parts diagram . 16
Figure 12 - Small angled semi-circular, or rectangular tree type organiser . 18
Figure 13 - Large rectangular trays ‘book type’ organiser . 18
Figure 14 - Large circular/rectangular trays - Juke box type organiser . 18
Figure 15 - Small circular/oval/rectangular trays - Shelf type organiser . 18
Figure 16 - Space for cables . 19
Figure 17 - ABF system functional parts diagram - Microduct intercept (only) . 19
Figure 18 - ABF functional parts diagram - Blow from point . 19
Figure 19 - Examples - Future proof closure expansion - Diagram . 20
Figure 20 - Examples - Closure outside profile, dimensioning conventions . 20
Figure 21 - Examples microduct connector outside/bulkhead profile . 21
Figure 22 - Example - Track joint configuration sample . 24
Figure 23 - Example - Distribution joint configuration sample . 25
Tables
Table 1 - Typical variant table layout - Sealed FMS closures (dome, pan and inline)
EN 50411-2-X – X - X - X - XX - XX - X . 22
1 2 3 4 5 6
Table 2 - Typical closure and tray selection - FMS fibre separation levels . 23
Table 3 - Typical variant table layout - Sealed ABF closures
EN 50411-2-X – X - X - X - X - XXX - XX - XX - XX . 23
1 2 3 4 5 6 7 8
Table 4 - Typical all ABF closure capacity selection to microduct connector capacity . 23
Table 5 - Typical variant table layout - Microduct connectors - Sealed and non-sealed closures
EN 50411-2-X – XXX/XXX – XXX/XXX – XX – X . 23
1 2 3 4
Table 6 - Sealed closure sealing, optical and appearance performance criteria . 26
Table 7 - Sealed closure environmental and mechanical performance test methods . 27
Table 8 - Unsealed closure environmental and mechanical performance test methods . 28
Table 9 - Microduct connectors sealing, optical and appearance performance criteria . 29
Table 10 - Microduct connector - Environment and mechanical performance test methods . 29

1 Scope
1.1 Rules and conventions
This general and guidance document provides a framework for new product specification in the series
EN 50411-2-X rules and conventions under which a closure interface is created, and provides a consistent
structure:
• headings;
• format;
• abbreviations;
• definitions;
• references;
• descriptions;
• document structure details;
• tables;
• diagrams;
• dimensions; and
• product variants.
This general and guidance document provides general information that defines the closure options, including
the following:
• level of sealing, sealed or non-sealed;
• closure configurations, shape and/or entry port orientation;
• ‘fibre management system’ or ‘microduct’ connectors contained within the housing;
• cable port entry configurations, number of ports;
• cable sealing method, heat or non-heat activated.

In order to comply with the specification, the following closure and/or FMS requirements must be defined:
• sealing and optical functionality;
• physical dimensioning, giving the maximum outer perimeters for all sizes;
• geometrical form and or shape;
• dimensioning.
1.2 Product definition
A product specification shall contains the initial, start of life dimensional, optical, mechanical and
environmental performance requirements of a fully installed closure in order for it to be categorised as an
EN standard product.
The product specification should provide external overall dimensioning of closures to fit in their external
location, e.g. underground chambers, street furniture or aerial applications.

A fibre splice closure product specification includes both the parameters of the closure housing, the fibre
splicing management system. These systems are always supplied together with the closure as a matched
set including other functional or ancillary parts of an optical node.

An air blown fibre closure product specification includes only the parameters of the closure housing. Air
blown fibre closures are normally supplied without a microduct connector, largely because of uncertainty
over connector method, microduct sizes, quantity and type of connector used.

This closure specification allows single mode fibre to be used, and covers all IEC or EN standards of optical
fibre cables as listed in the normative references with their various fibre, capacities, types and designs.

For convenience the term “cable” in this document may refer to different types of optical fibre cable designs,
including ‘air blown fibre’, ‘protected microduct’, or ‘microduct’.

- 7 - EN 50411-2:2008
1.3 Operating environment
All tests for closures combined with the severity and duration, and are representative of an outside plant for
subterranean and/or aerial environments defined by:
ETSI EN 300 019 series Class 8.1: underground locations (without earthquake requirement)
EN 61753-1 Category S: subterranean environment
Category A: aerial environment.

1.4 Reliability
Whilst the anticipated service life expectancy of the closure in this environment is at least 20 years,
compliance with this a product specification does not guarantee the reliability of the product. This should be
predicted using a recognised reliability assessment programme.

1.5 Quality assurance
Compliance with product specifications does not guarantee the manufacturing consistency of the product.
This should be maintained using a recognised quality assurance programme.

1.6 Safety
All closures to be supplied free of sharp edges or pointed projections that can harm the installation operator.
Materials, which are likely to come into contact with personnel, shall be non-toxic and shall not be a potential
health or environmental hazard.

For all air blown micro-duct system contained within sealed closures, the closures must be fitted with an over
pressure safety system.
In addition for subterranean closure applications or applications where a high level of contamination is
expected provision should be taken to ensure that the over pressure safety system is functional.

In choosing the over pressure air safety system, attention should be given to the following:
• blow off pressure setting – accuracy and repeatability;
• the size of micro-ducts likely to fail, ensuring that the safety valve has adequate area to exhaust fast
enough without building up a high back pressure;
• metallic corrosion and its effect on the operation;
• if a valve is used it should never be used as an electrical grounding connection.

1.7 FMS closure future proof requirement

Conventional optical fibre cables splicing organiser with closure, must in service be capable of being
expanded to increase fibre splicing capacity at some future point in time (additional trays).

1.8 Fibre types and cable designs

This closure standard must allow single mode fibres to be used and covers all IEC or EN standards for
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), EN 60794-3 (outdoor) and EN 60794-5 (microduct
cabling).
1.9 FMS to closure interfaces – Informative information
A FMS system consists of a set of grouped splice trays or organiser. They often dictate the shape and future
proof features of a closure. Therefore, splice trays or organiser information found in Clause 8 is contained
within a standard and is recommended that it is contained in each closure with FMS product specification, as
an informative annex.
2 Normative references
The following referenced documents are indispensable for the application 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 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 60794-1-2 Optical fibre cables - Part 1-2: Generic specification - Basic optical cable test procedures
(IEC 60794-1-2)
EN 60794-5 Optical fibre cables - Part 5: Sectional specification - Microduct cabling for installation by
blowing (IEC 60794-5)
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 61300-2-4 Part 2-4: Tests - Fibre/cable retention (IEC 61300-2-4)
EN 61300-2-5 Part 2-5: Tests - Torsion/twist (IEC 61300-2-5)
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 61300-2-12 Part 2-12: Tests - Impact (IEC 61300-2-12)
EN 61300-2-22 Part 2-22: Tests - Change of temperature (IEC 61300-2-22)
EN 61300-2-23 Part 2-23: Tests - Sealing for non-pressurized closures of fibre optic devices
(IEC 61300-2-23)
EN 61300-2-26 Part 2-26: Tests - Salt mist (IEC 61300-2-26)
EN 61300-2-33 Part 2-33: Tests - Assembly and disassembly of closures (IEC 61300-2-33)
EN 61300-2-34 Part 2-34: Tests - Resistance to solvents and contaminating fluids (IEC 61300-2-34)
EN 61300-2-37 Part 2-37: Tests - Cable bending for closures (IEC 61300-2-37)
EN 61300-2-38 Part 2-38: Tests - Sealing for pressurized closures of fibre optic devices
(IEC 61300-2-38)
EN 61300-3-1 Part 3-1: Examinations and measurements - Visual examination (IEC 61300-3-1)
EN 61300-3-3 Part 3-3: Examinations and measurements - Active monitoring of changes in attenuation
and return loss (IEC 61300-3-3)
EN 61300-3-28 Part 3-28: Examinations and measurements - Transient loss (IEC 61300-3-28)
EN 61753-1 Fibre optic interconnecting devices and passive components performance standard -
Part 1: General and guidance for performance standards (IEC 61753-1)
EN 187105 Single mode optical cable (duct/direct buried installation)
ETSI EN 300 019 Environmental Engineering (EE) - Environmental conditions and environmental tests for
series telecommunications equipment

- 9 - EN 50411-2:2008
3 Definitions and abbreviations

3.1 Definitions
3.1.1
dome closure
a cap ended cover sleeve, for access to its internal elements when the cover is removed. Cable entry ports
are positions onto a base, which is attached the open end of the cover and is opposite to and on the same
axis as the cover removal direction
3.1.2
pan closure
it provides a cap ended cover sleeve, for access to its internal elements when the cover is removed. Cable
entry ports are positions onto a base, which is attached the open end of the cover and at a 90 degree angle
to the cover axis, in the direction of cover removal
3.1.3
inline closure (shell type 2a and 2b)
it provides a cable entry ports onto a single base and protruding/positioned at each end of the closure and
inline with it. The ports at each end are integral to a single base with only one lift off cover. Shell shaped
closures are significantly different therefore are divided into two types; 2a, short and fat, and 2b, long and
thin
3.1.4
inline closure (end plate type 1a)
it provides a cable entry ports onto a base at each end of the closure and inline with it. The bases at each
end are separate and plate shaped, the cable entry ports on the two bases, are plates linked with tie bars.
There are two semi-circular shaped covers attached to the plates and attached to each other
3.1.5
air blown fibre closure
any shaped closure, with cable, or duct ports, positioned in any direction from it, and has a cover to gain
access to the microduct tubes connections inside
3.1.6
fibre management system
a system to control fibre routing from the incoming to the outgoing fibres, containing one or more splice
cassettes and additional functional elements
3.1.7
fibre splicing system
it provides a means for routing, storing and protecting of fibre splices or other passive optical devices in a
predetermined order, from one cable sheath opening to another. Fibre circuits may be separated to an
appropriate separation level, SC, SR, SE, ME and MR. This will limit the risk of interruption of traffic to those
fibres that belong to the same of circuits
3.1.8
air blown fibre
it provides for pressurised air to propel, fibres, fibre units and microduct optical fibre cables through a
microduct tube system
3.1.9
microduct connector system
it provides for routing blown fibres or microduct fibre units, between hollow conduits (microducts), and
interconnects the microducts by use of pneumatic connectors, tube welding, crimp connectors or push on
connectors. The microduct connection method is both air and water tight. It is organised into accessible rows
within the closure
3.1.10
single circuit
a fibre management system is a group of fibres providing 1 termination or service on 1 or 2 fibres. In this
document a single circuit is considered to be a circuit of 2 fibres or a 4 fibre ribbon circuit

3.1.11
single element
a fibre management system is a cable subassembly. It comprises one or more optical fibres inside a
common covering e.g. tube, or inside one groove of a grooved cable (slotted core cable). Single elements
provide more than one termination or circuit of typically 12 fibres. In this document a single element is
considered to be a group of 12 fibres
3.1.12
single ribbon
a fibre management system is a cable subassembly. It comprises one optical ribbon. Single ribbon is a group
of fibres providing one termination or service of typically 4, 8 or 12 fibres
3.1.13
multiple elements
a fibre management system provides all necessary equipment to connect a defined number of incoming and
outgoing fibres/cables. It comprises storage and protection of fibres and interconnections in one splice tray
for more than one single element. Typically splice tray capacities are between 24 and 144 fibres
3.1.14
multiple ribbons
a fibre management system provides all necessary equipment to connect a defined number of incoming and
outgoing fibre ribbons that are generally housed within a singe tube within the cable. This tube is fixed to the
entry and exit ports of the splice tray. It comprises storage and protection of more than one single ribbon, but
typically six or more fibre ribbons and their interconnections in a single splice tray for ribbons between 4 and
36 fibres, but typically 12 fibre ribbons. There are also many different names for this structure, e.g. mass
storage or mass ribbons. Typically splice tray capacities are between 36 and 144 fibres
3.1.15
single circuit fibre management system
a fibre system separation level, that is down to the individual customer level achieving the minimum of
customer circuit disturbance
3.1.16
positive fibre management system
fibre systems capable of controlling the fibre minimum bend radius throughout the network
3.1.17
future proof fibre management system
a fibre management system is capable of change, or expansion in the future, covering all FMS (SC, SE, SR,
ME, MR) by modular adaptation
3.1.18
future proof closures
closures that should be capable to be able to change or expand in the future, without disturbing existing
cables and fibre systems
3.1.19
end to end solution, organiser
fibre management systems that have the flexibility to be a common system for all and any part of the
network, fibre/cable types and capacities, over all transmission wave lengths and media
3.1.20
duct
an underground direct buried tubular pipe, rigid supplied in lengths or flexible supplied in coils
3.1.21
sub ducts
two or more small sub ducts inserted/stored into a larger duct, to provide the ability to feed cables down each
sub duct
3.1.22
blow off pressure
the air pressure level or valve which is considered the limit of safe working pressure inside the closure, which
is exhausted to atmosphere at this valve

- 11 - EN 50411-2:2008
3.1.23
microduct
a small, flexible, lightweight tube with an outer diameter typically less than or equal to 16 mm
3.1.24
protected microduct
one or more microducts surrounded by a protective sheath or pre-installed in a protective duct
3.1.25
microduct optical fibre cables
optical fibre cables suitable for installation by blowing into a microduct
3.1.26
microduct optical fibre unit
a fibre unit that is suitable for installation by blowing into a microduct. They differ from microduct optical fibre
cables in that they provide less protection to the fibres that they contain
3.1.27
straight microduct connectors
microduct connectors are used to connect two microducts together. This connector has a means of
microduct attachment and sealing on both sides and is typically unsupported (floating inside the closure)
3.1.28
close down microduct connectors
microduct connectors that are used for access for blowing head equipment for cascade blowing which allow
a microduct to be opened and resealed after blowing, without detriment to the fibre in situ
3.1.29
liquid block microduct connectors
microduct connectors that are used at a transition point to stop liquids from flowing between the connected
microducts to avoid liquid and contaminant ingress and liquid damage to other equipment
3.1.30
liquid block with barb end connectors
similar to a liquid block connector. The barb end is designed to interface with the non-microduct (transport
tubing), which protects the fibre at a ’fibre management system‘ closure
3.1.31
end stop microduct connector
microduct connectors that are used for sealing open ended micro-duct to avoid air leakage, water or foreign
material ingress and for safety reasons
3.1.32
reducers - microduct connectors
microduct connectors that are used to join different microduct cable sizes, with a transition internally to avoid
fibre ‘hang up’ preventing the fibre flowing during blowing
3.1.33
enlarger - microduct connectors
microduct connectors are used to connect two microducts together. This connector has a common internal
diameter with different outside diameters. Typically they are to connect a heavy walled to a thinner wall MD
3.1.34
different ID reducers/enlarger stem microduct connectors
a stem connector which connects two microducts with the same OD but different ID, including a smooth
internal transition to prevent fibre ‘hang ups’. Typically they have microduct attachment and sealing at one
end of the connector, and a stem on the other end to facilitate attachment to a straight connector
3.1.35
different ID reducers/enlarger microduct connectors
a connector which connects two microducts with the same OD but different ID, including a smooth internal
transition to prevent fibre hang ups. Typically they connect a heavy walled to a thinner wall MD

3.1.36
different OD reducers/enlarger stem microduct connectors
a stem which connects two microducts with the same ID but different OD. Typically they have microduct
attachment and sealing at one end of the connector, and a stem on the other end to facilitate attachment to a
straight connector
3.1.37
different OD reducers/enlarger microduct connectors
connectors which connect two microducts with the same ID but different OD
3.1.38
different ID and OD reducers/enlarger stem microduct connectors
a stem which connects two microducts with a different OD and different ID, including a smooth internal
transition to prevent fibre hang ups. Typically they have microduct attachment and sealing at one end of the
connector, and a stem on the other end to facilitate attachment to a straight connector
3.1.39
different ID and OD reducers/enlarger microduct connectors
a connector which connects two microducts with different OD and different ID, including a smooth internal
transition to prevent fibre hang ups

3.2 Abbreviations
ABF air blown fibre
AC across corners
FMS fibre management system
ID inside diameter (microducts)
MCS microduct connector system
MD microduct
ME multiple elements
MMS microduct management system
MR multiple ribbons
OD outside diameter (microducts)
PS Product Specification
SC single circuit
SR single ribbon
4 Closure options defined
4.1 Closure with FMS housing functionality

A closure comprises a housing that is attached to the ends of the joined cable sheaths and a means for
containing and protecting the fibres, splices, and other passive optical devices.

The closure with FMS allows for a physical housing structure that provides for optical cable fixing, sealing,
anchoring, liquid and gas blocking, spare cable storage and routing up to the input and output fibres of the
fibre management system.
4.2 ABF closure housing functionality

An air blown fibre closures comprises an access housing that allows the interconnection of various cables;
protected microduct, microducts, sub-ducts and/or ducts. The microducts are joined together using various
microduct connector designs (see 4.8).

The closure allows for a physical housing structure that provides for microduct fixing, sealing (sealed closure
only), anchoring, water and/or gas blocking, microduct storage and routing up to the input and output
microducts of the ABF housing.

- 13 - EN 50411-2:2008
4.3 Closure shape options defined

All closures fall into one or more of the following shapes:

• dome shape;
• pan shape;
• inline shape;
• ‘T’ shape;
• ‘Y’ shape;
• ‘X’ shape.
4.4 Product specification options defined

All closure and microduct connector product specifications must align with one of the following titles and be
labelled, EN 50411-2-X:
• sealed dome closures for use with a FMS;
• sealed pan closures for use with a FMS;
• sealed inline closures for use with a FMS;
• sealed closures for use with ABF microducts;
• non-sealed closures for use with ABF microducts;
• microduct connectors for use in sealed closures;
• microduct connectors for use in non-sealed closures.

4.5 Common base options defined

All closures must have one or more of the following defined base configurations:
• track joint configuration used on trunk cable, with minimum of 2 cable entries;
• spur joint configuration used on local feeder cable with minimum of 3 cable entries;
• distribution joint configuration used on customer feed cable with minimum of 8 cable entries.
The design of the 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 micro-ducts or fibres between both cable openings for spur
and distribution joint bases. 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.
4.6 Cable entry seal options
All closures must have a cable entry sealing method as part of the variant selection system. Cable
entry seal systems can be one of the following:
a) dedicated heat activated heat source, for example, electrical, infrared, hot air or flame
• thermo-shrinkable materials
• hot melt adhesives
• polyethylene injection welding
b) dedicated cold applied
• mastic, tapes, pastes, potting compounds, gels and cold adhesives
• o-rings, grommets, rubber shapes, pre expanded tubing are cold processes
c) combined heat activated and cold applied

4.7 Fibre management system options defined

The fibre management system must identify each and every fibre circuit separation level, using a standard
number of fibres per level, specified in the following:
• single circuit – 2 fibres per tray;
• single ribbon – 4 or more fibres per ribbon;
• single element – 12 fibres per tray;
• multiple element – various quantities of single elements;
• multiple ribbon – 12 fibre single ribbons.

4.8 ABF microduct connector options defined

• straight
• straight bulkhead
• ID reducer/enlarger stem
• ID reducer/enlarger
• OD reducer/enlarger stem
• OD reducer/enlarger
• ID and OD reducer/enlarger stem
• ID and OD reducer/enlarger
• close down
• liquid block
• liquid block with barb
• end stop
5 Closure options, geometrical forms and dimensioning requirements

5.1 Dome and pan closure geometrical forms

The design of the closure housing should allow one mid span or two or more cable ends to enter th
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