1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Fibre organisers and closuresto be used in optical fibrecommunication systems Product specifications Part 2-5: Se
2、aled closures for air blown fibremicroduct, type 1, for category S EN 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 a minimum of 20 years, compliance with this specif
3、ication does not guarantee the reliability of the product. This should be predicted using a recognised 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 recogni
4、sed quality assurance programme. 1.5 Allowed fibre and cable types This closure standard covers all IEC standard optical fibre microducts, and protected microducts with their various fibre capacities, types and designs. This includes, but is not limited to, optical fibre cable standard EN 60794-5. T
5、his product specification has only considered protected microduct cables containing microducts of same outside diameters. There are other hybrid protected microduct cables with microducts of differing ODs, with too many variants to be included in this PS. 1.6 Allowed microduct connector types This c
6、losure standard covers all EN standard microduct connectors, including: straight, reducer/enlarger stem, reducer/enlarger, close down, liquid block, liquid block with barb end, and end stop connectors. This includes, but is not limited to, EN 50411-2-8. 1.7 Microduct storage constraints Microduct ex
7、cess storage is not required in all air blown fibre closures. Some closure types do not have sufficient internal space to provide storage. The need for microduct storage is provided inside the closure when opened, typically to ensure that there is enough microduct to fulfil the following functions:
8、remove the coiled microduct attached to the closedown connectors, to a remote location, close to blowing equipment, in the process uncoiling the microducts to aid blowing; provide additional microduct if repeated cut backs for connectors are planned or likely to be fitted throughout the closure life
9、. The minimum microduct storage bend radius is based on the outside diameter and material selection, typically based on 12 times the outside diameter (below 8 mm) and 20 times above. During fibre blowing the bend radius is typically 20 times the microduct diameter. BS EN 50411-2-5:2009EN 50411-2-5:2
10、009 - 8 - 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 50411-2-8 Fib
11、re organisers and closures to be used in optical fibre communication systems Product specifications Part 2-8: Microduct connectors, for air blown optical fibres, Type 1 EN 60068-2-10 Environmental testing Part 2-10: Tests Test J and guidance: Mould growth (IEC 60068-2-10) EN 60794-1-2:2003 Optical f
12、ibre cables Part 1-2: Generic specification Basic optical cable test procedures (IEC 60794-1-2:2003) EN 60794-5 Optical fibre cables Part 5: Sectional specification Microduct cabling for installation by blowing (IEC 60794-5) EN 61300 series Fibre optic interconnecting devices and passive components
13、Basic test and measurement procedures (IEC 61300 series) 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-
14、5 Part 2-5: Tests Torsion/twist (IEC 61300-2-5) EN 61300-2-10 Part 2-10: Tests Crush resistance (IEC 61300-2-10) EN 61300-2-12:2005 Part 2-12: Tests Impact (IEC 61300-2-12:2005) EN 61300-2-22 Part 2-22: Tests Change of temperature (IEC 61300-2-22) EN 61300-2-23:1997 Part 2-23: Tests Sealing for non-
15、pressurized closures of fibre optic devices (IEC 61300-2-23:1995) 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
16、-34) EN 61300-2-37 Part 2-37: Tests Cable bending for fibre optic closures (IEC 61300-2-37) EN 61300-2-38:2006 Part 2-38: Tests Sealing for pressurized fibre optic closures (IEC 61300-2-38:2006) EN 61300-3-1 Part 3-1: Examinations and measurements Visual examination (IEC 61300-3-1) EN 61300-3-3:2003
17、 Part 3-3: Examinations and measurements Active monitoring of changes in attenuation and return loss (IEC 61300-3-3:2003) 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
18、Part 1: General and guidance for performance standards (IEC 61753-1) ETSI EN 300 019 series Environmental Engineering (EE) Environmental conditions and environmental tests for telecommunications equipment ISO 1998-1 Petroleum industry Terminology Part 1: Raw materials and products EN 590 Automotive
19、fuels Diesel Requirements and test methods BS EN 50411-2-5:2009- 9 - EN 50411-2-5:2009 3 Definitions and abbreviations 3.1 Definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 ducts semi-rigid underground pipe, typically manufactured from a polymeric materi
20、al, and typically greater than 65 mm outside diameter 3.1.2 sub-ducts underground semi-flexible pipes, which may fit inside a duct, typically manufactured from a polymeric material, and typically less than 50 mm outside diameter 3.1.3 microducts (MD) small, flexible, lightweight tube with an outer d
21、iameter typically less than or equal to 16 mm 3.1.4 protected microducts one or more microducts surrounded by a protective sheath and/or protected by a duct/sub-duct 3.1.5 microduct optical fibre cables optical fibre cables suitable for installation by blowing into a microduct 3.1.6 microduct fibre
22、units fibre unit that is suitable for installation by blowing into a microduct. It differs from microduct optical fibre cables in that it provides less protection to the fibres that it contains 3.1.7 air blown fibre (ABF) microduct closure ABF microduct closures provide a physical housing for microd
23、uct management; connection, fixing, sealing, anchoring, liquid and/or gas blocking, storage and routing up to the input and output protected microduct of the air blown fibre cable closure system 3.1.8 blowing point closure closure used as a position for blowing fibre at multiple points in series (ca
24、scade blowing). Typically the closure contains close down microduct connectors, for fibre access to the blowing head equipment 3.1.9 straight microduct connectors microduct connectors are used to connect two microducts together. This connector has a means of microduct attachment and sealing on both
25、sides and is typically unsupported (floating inside the closure) 3.1.10 straight bulkhead 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 supported on a bulkhead attac
26、hed by a suitable fixing system (i.e. nut or clip) 3.1.11 different ID reducers/enlarger stem microduct connectors stem connector which connects two microducts with the same OD but different ID, with a smooth internal transition to prevent fibre hang ups. Typically they have microduct attachment and
27、 sealing at one end of the connector, and a stem on the other end to facilitate attachment to a straight connector 3.1.12 different ID reducers/enlarger microduct connectors connectors which connects two microducts with the same OD but different ID, including a smooth internal transition to prevent
28、fibre hang ups. Typically they are used to connect a heavy walled to a thinner wall MD BS EN 50411-2-5:2009EN 50411-2-5:2009 - 10 - 3.1.13 different OD reducers/enlarger stem microduct connectors stem which connects two microducts with the same ID but different OD. Typically they have microduct atta
29、chment and sealing at one end of the connector, and a stem on the other end to facilitate attachment to a straight connector 3.1.14 different OD reducers/enlarger microduct connectors connector which connects two microducts with the same ID, but different OD 3.1.15 different ID and OD reducers/enlar
30、ger stem microduct connectors 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 attachm
31、ent to a straight connector 3.1.16 different ID and OD reducers/enlarger microduct connectors connector which connects two microducts with different ODs and different IDs, including a smooth internal transition to prevent fibre hang ups 3.1.17 close down microduct connectors microduct connectors tha
32、t are used for fibre access for blowing head equipment for cascade blowing, allowing a microduct to be opened and resealed after blowing, without detriment to the fibre in situ 3.1.18 liquid block microduct connectors microduct connectors that are used at a transition point to stop liquids from flow
33、ing between the connected microducts to avoid liquid and contaminant ingress and liquid damage to other equipment 3.1.19 liquid block with a barb end similar to a liquid block connector, at the barb end. The barb end is designed to interface with the non-microduct (transport tubing), which protects
34、the fibre at a “fibre management system” closure 3.1.20 end stop microduct connectors microduct connectors that are used for sealing open ended microduct, avoiding air leakage, water or foreign material ingress 3.1.21 connector insertion force force required to insert the microduct into the connecto
35、r without damage 3.1.22 fibre management system (FMS) system to control fibre routing from the incoming to the outgoing fibres, containing one or more splice cassettes and additional functional elements 3.1.23 microduct management system system to control microduct routing inside a closure or housin
36、g, from the incoming to the outgoing microduct, all jointed together with microduct connectors of various functional types 3.1.24 burst pressure point at which the closure fails to contain pressure 3.1.25 cut backs process to remove a short length of microduct in order to prepare the ends, prior to
37、fitting a new connector, ensuring better sealing and attachment faces BS EN 50411-2-5:2009- 11 - EN 50411-2-5:2009 3.2 Abbreviations For the purposes of this document, the following abbreviations apply. PS Product Specification MD Microduct ABF Air Blown Fibre ID Inside Diameter (microducts) OD Outs
38、ide Diameter (microducts) AC Across Corners MMS Microduct Management System 4 Description 4.1 Microduct closure An ABF microduct closure comprises a closure housing that is attached to the ends of an underground installed duct or sub duct or an air blown fibre protected microduct. Microduct closures
39、 comprises an access housing that allows the interconnection and storage of microducts or protected microducts. Figure 1, shows the minimum space profile required to house microduct connectors. Figure 1 Schematic Minimum microduct and connector space profile (see Annex C) 4.2 Closure housing functio
40、ns Microduct closures for protected microducts have three basic functions they are to provide: a branch off for secondary microduct installation to a customer; an intercept to an existing pre-installed protected microduct; an access point for blowing fibre onward using conventional blowing equipment
41、. 4.3 Burst pressure The microduct system may fail therefore the closure must be able to be fitted with an over pressure safety system. This system should be able to exhaust air fast enough to ensure that a safe working pressure of equal to, or less than 0,4 bars is maintained when the correct insta
42、llation pressure is applied. W centred (minimum) (Inside the cover body ends or end plates) V Diameter (minimum) (Inside cover diameter) Minimum space required as a diameter where microduct connectors are equally spaced Duct or cable attachmentBS EN 50411-2-5:2009EN 50411-2-5:2009 - 12 - 4.4 Closure
43、 housing configurations 4.4.1 Inline closure housing configurations (I) Inline closures have cable entry ports in two positions at opposite ends. Each end typically has one or two ports. Figure 2 shows a typical option for the I closure type, any entry port can also be an exit port. Figure 2 Inline
44、Double port ended (I) 4.4.2 Tee closure housing configurations (T) Tee closures have cable entry ports in three positions, one at each end and one at an acute angle, typically at 90. Each position typically has one or two ports. Figures 3 and 4 show typical options for the T closure type. This group
45、 also covers Y closures at various angles. Figure 3 Tee Single entry port ends with a single port at an acute angle Figure 4 Tee Double entry port ends with single or double ports at an acute angle 4.4.3 Pan closure housing configuration (P) Pan closures have cable entry ports in one position at 90
46、to the cover removal axis. They have typical three or more ports. Figures 5 and 6 show typical options for the P closure body types, typically circular, elliptic or rectangular. Figure 5 Pan Entry ports in one position at 90 to the circular cover removal axis Figure 6 Pan Entry ports in one position
47、 at 90 to the rectangular cover removal axis BS EN 50411-2-5:2009- 13 - EN 50411-2-5:2009 4.4.4 Dome closure housing configuration (D) Dome closures have cable entry ports entering and exiting the same side, with high numbers of small cable ports and low numbers of larger ports. Microduct storage is
48、 required over 180. Figure 7 shows a typical option for the D closure type. Figure 7 Dome Single end entry ported closure 4.5 Entry seals Entry seal systems can be either: - (H) Dedicated heat activated heat source for example, electrical, infrared, hot air or flame thermo-shrinkable materials, hot
49、melt adhesives, polyethylene injection welding. - (C) Dedicated cold applied mastic, tapes, pastes, potting compounds, gels and cold adhesives, o-rings, grommets, rubber shapes, are cold processes. - (U) Combined heat activated and cold applied All seals should be installed according to manufacturers guidelines. 4.6 Common base configurations The design of the closure housing shall allow the jointing of two or more microducts, or protected microduc
