Optical Fibre Closure Kits (OFC)
Optical fibre closure kits designed to protect, organise, and seal fibre optic cable joints in telecom and railway communication networks — providing long-term environmental protection and organised splice management across underground, aerial, and duct-installed OFC routes.
Fibre Splice Protection and Closure Systems
Western Cablex optical fibre closure kits provide a complete, sealed enclosure for fibre optic cable splices — protecting fusion-spliced fibres from moisture, mechanical stress, and environmental exposure throughout the service life of the cable system. Each closure accommodates modular splice trays that organise and protect individual fibre splices within a structured, serviceable enclosure body.
The range covers dome type and horizontal inline configurations to match the installation geometry of the joint location. Both types are designed for use in telecom and railway OFC network deployments — including direct-buried, duct-installed, and aerial applications — where long-term seal integrity and re-enterability are primary performance requirements.
- Closure types Dome & Horizontal (Inline)
- Fibre capacity Up to 144 fibres
- IP rating IP68
- Sealing system Mechanical compression seal
- Installation Direct buried / Duct / Aerial
- Application Telecom & Railway OFC
Types of OFC Closure Kits
Three closure configurations covering the primary installation geometries and application requirements across telecom and railway OFC networks.
Dome Type Closures
Vertical dome-shaped closure body suitable for branch, distribution, and multi-cable entry configurations. Accommodates multiple cable entries and higher fibre counts — widely used in underground and direct-buried OFC network joints.
Horizontal (Inline) Closures
Inline horizontal closure body designed for straight-through cable joints along a continuous fibre route. Compact profile suitable for duct-installed joints, aerial mid-span locations, and restricted access chambers.
Railway Fibre Closures
Closures supplied and installed on railway OFC routes — covering lineside, station, and trackside OFC joint locations. Compatible with the cable entry configurations and fibre management requirements of railway communication and signalling OFC systems.
Why These Closures Are Specified
Engineered to protect and manage fibre splices across the demanding environments of telecom and railway OFC infrastructure.
Long-Term Fibre Splice Protection
The closure body and sealing system protect fusion-spliced fibres from moisture, dust, and mechanical disturbance throughout the service life of the OFC cable system — in buried, ducted, and aerial environments.
IP68 Moisture Sealing
Mechanical compression seals at the closure body perimeter and cable entry ports provide IP68-rated protection — suitable for direct-buried and submerged installations where long-term watertightness is a specification requirement.
Organised Fibre Management
Modular splice trays within the closure body provide structured storage and bend-radius control for each spliced fibre — preventing micro-bending losses and maintaining optical performance at the joint location.
Re-enterable Closure Design
Closures can be re-entered and resealed in the field — allowing additional splices, fibre reconfigurations, or fault repairs without replacement of the closure body. Re-enterability reduces long-term maintenance costs on live OFC routes.
Multi-Environment Suitability
Suitable for direct-buried, duct-installed, and aerial OFC joint locations — the same closure platform covers the principal installation environments encountered on telecom and railway OFC network routes.
Railway Network Suitability
Specified and installed on railway OFC routes — supporting trackside, station, and lineside OFC joint locations on mainline, metro, and high-speed rail communication infrastructure.
System & Performance Data
Reference specifications for engineering, design, and procurement. Contact our technical team for project-specific sizing and configuration data.
| Closure types available | Dome type and Horizontal (inline) type |
|---|---|
| Body material | Engineered polymer — impact-resistant, UV-stabilised |
| Splice trays | Modular — 12 fibres per tray; trays stack within closure body |
| Fibre capacity | 12 to 144 fibres (configuration dependent on closure size and tray count) |
| Sealing system | Mechanical compression seal — closure body and cable entry ports |
| IP rating | IP68 — suitable for direct-buried and submerged applications |
| Cable entry ports | 2 to 8 ports (knockout configuration — unused ports sealed) |
| Installation type | Direct buried, duct installed, aerial (with mounting bracket) |
| Operating temperature | –40°C to +65°C |
| Application | Telecom OFC networks, railway communication and signalling OFC routes |
Typical Closure Components
Each closure kit is supplied as a complete system. Component count and configuration vary by closure size and fibre capacity.
Closure Body
Engineered polymer enclosure — dome or inline configuration — housing the splice trays and providing mechanical protection and the structural base for the sealing system. Designed for re-entry and resealing in the field without component replacement.
Splice Trays
Modular trays that hold and protect individual fusion-spliced fibres — providing organised storage, splice protection, and bend-radius control for each fibre within the closure. Trays stack within the closure body to increase fibre capacity.
Sealing Gaskets and Elements
Compression gaskets at the closure body joint face and individual sealing grommets or gel pads at each cable entry port — forming the IP68 seal across the full closure perimeter and cable entry interfaces.
Cable Entry Ports
Knockout or pre-fitted cable entry ports sized to accommodate the cable outer diameter at each entry position. Unused ports are sealed with blind plugs. Port count depends on the number of cables entering the closure at the joint location.
Mounting and Grounding Accessories
Mounting brackets, cable strength member anchors, and earthing connections where required — supporting aerial and duct-installed closure configurations and providing cable fixity and mechanical strain relief at the cable entry interface.
Exact component count and configuration depend on closure size, fibre capacity, and installation type. Contact our technical team for configuration details specific to your cable type and joint location.
Where OFC Closure Kits Are Used
Deployed across railway and telecom OFC networks wherever fibre splice protection, organised fibre management, and long-term seal integrity are installation requirements.
Railway OFC Networks
Fibre closure systems for railway communication OFC routes — covering lineside, trackside, and station OFC joint locations on mainline, metro, and high-speed rail infrastructure where reliable fibre splice protection is a system requirement.
Metro Rail Communication Systems
OFC closures installed on metro rail underground and elevated OFC routes — protecting fibre joints in the communication and control network infrastructure that supports metro train control, CCTV, and passenger information systems.
Telecom Backbone Networks
Inline and dome closures used at mid-span and distribution joint locations on telecom backbone and long-haul OFC routes — providing IP68-rated splice protection in direct-buried and duct-installed cable runs.
Broadband Access Networks
Distribution closures for FTTH, FTTB, and broadband access OFC networks — organising and protecting fibre splices at feeder cable distribution points, street cabinets, and last-mile access joint locations.
Underground and Aerial OFC Routes
Both closure types are suited for underground direct-buried, duct, and hand-hole installations as well as aerial mid-span locations — with appropriate mounting hardware and sealing configurations for each installation environment.
Infrastructure and EPC Projects
OFC closure systems supplied to EPC contractors for inclusion in power, transport, and civil infrastructure projects where OFC communication networks form part of the project scope — including smart city, highway, and utility infrastructure.
How to Select the Right OFC Closure
Five parameters determine the correct closure. Confirm each before ordering to ensure the closure matches the cable and site requirements.
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01
Closure Type — Dome or Inline
Select a dome closure for branch joints, distribution points, or locations with multiple cable entries. Select an inline horizontal closure for straight-through joints along a continuous cable route. The joint geometry at the installation location is the primary driver of this selection.
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02
Fibre Count and Capacity
Specify the total fibre count at the joint — including any future spare fibres that will be stored within the closure. Select a closure with sufficient splice tray capacity to accommodate the full fibre count with a minimum of one spare tray for future use. Closure capacity is defined by the number of splice trays accommodated; each tray holds 12 fibres.
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03
Installation Environment
Confirm whether the closure will be installed in a direct-buried position, within a duct or chamber, or at an aerial mid-span location. Each environment has different mechanical protection, mounting, and cable strain-relief requirements. Aerial closures require appropriate mounting brackets and messenger wire anchoring in addition to the standard closure assembly.
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04
Cable Entry Count
Specify the number of cables entering the closure at the joint location — including any cables routed through the closure as pass-through entries. Closure port configurations range from 2-entry inline to multi-entry dome configurations. Confirm the cable outer diameter at each entry to ensure the correct port and grommet sizing.
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05
Application — Railway or Telecom
For railway OFC installations, confirm whether there are any project-specific technical requirements for the closure — including compatibility with the cable outer diameter, minimum fibre bend radius, splice tray type, or closure re-entry requirements specified in the railway project scope. For telecom network deployments, confirm the network operator's standard closure specification before ordering.
For installations with non-standard cable outer diameters, unusually high fibre counts, or special environmental conditions, contact our technical team with full site and cable details before ordering.
Common Technical Questions
A dome closure is a vertical, dome-shaped enclosure that accepts cables from the base — making it well-suited for multi-cable branch joints and distribution points where several cables enter the closure. An inline (horizontal) closure has a cylindrical body where cables enter from both ends — designed for straight-through joints along a continuous cable route. The choice depends on the joint geometry: use a dome for distribution or branching locations, and an inline closure for simple in-line route joints. Both types provide IP68 sealing and comparable fibre management performance.
IP68 is the highest ingress protection rating under IEC 60529 for solid particle and water protection — confirming the closure is dust-tight and protected against continuous immersion in water beyond 1 metre depth (for a defined duration per the manufacturer's specification). For direct-buried OFC installations, IP68 is the standard minimum requirement — confirming the closure will maintain its moisture seal under normal burial conditions including saturated soil and periodic waterlogging. IP68 is also appropriate for installations in underground chambers and pits where water accumulation can occur.
Yes. Western Cablex OFC closure kits are suitable for use on railway fibre optic cable networks — including trackside, lineside, and station OFC route joint locations on mainline, metro, and high-speed rail infrastructure. For railway projects with specific OFC closure specifications — including particular cable outer diameter ranges, fibre counts, or installation method requirements — contact our technical team with the project OFC specification to confirm the appropriate closure configuration. We can assist with technical documentation required for railway project submissions.
Fibre capacity depends on the closure size and the number of splice trays installed within the closure body. Each splice tray holds 12 fibres. Standard closure configurations range from 12-fibre (single tray) to 144-fibre (12 tray) capacity — with intermediate sizes available in 12-fibre increments. For higher fibre count requirements beyond the standard range, contact our technical team. When specifying fibre capacity, include spare fibre storage requirements — it is good practice to size the closure for at least one additional tray beyond the fibres being spliced at installation.
Yes — Western Cablex OFC closures are re-enterable. The mechanical compression sealing system allows the closure to be opened, the splice trays accessed, and the closure resealed using the original sealing gaskets and hardware. Re-entry may be required for fibre reconfiguration, additional splice tray installation, or fault repair after the initial installation. The sealing gaskets should be inspected at each re-entry and replaced if they show signs of compression set or damage. Contact our technical team for guidance on re-entry procedures and replacement gasket supply.
The closures are compatible with standard armoured and unarmoured fibre optic cables — including loose tube, tight buffered, and ribbon fibre constructions. Cable entry port sizes accommodate a range of cable outer diameters via interchangeable sealing grommets. Specify the cable outer diameter at each entry point when ordering to ensure the correct grommet configuration is supplied. For cables with non-standard outer diameters or unusual cable constructions, contact our technical team with the full cable specification before ordering.
Need Help Selecting the Right OFC Closure System?
Speak with our technical team for fibre count, installation type, and configuration guidance for your OFC network project.