Outdoor Terminations
Heat shrinkable outdoor cable termination systems designed to provide reliable insulation, stress control, and environmental protection across a wide range of cable types including XLPE, PVC, EPR, and PILC, in exposed and high-stress outdoor environments.
Engineered for Exposed and High-Stress Outdoor Environments
Outdoor termination systems extend the cable end-connection performance requirements beyond those of controlled indoor environments. In addition to insulation and stress control, the outdoor termination must withstand sustained exposure to UV radiation, rain, moisture, temperature cycling, and atmospheric pollution — conditions that accelerate surface tracking, erosion, and insulation degradation on unprotected termination surfaces.
Western Cablex outdoor termination kits incorporate weather-resistant shed systems, anti-tracking compound formulations, and enhanced creepage geometry — providing the additional environmental protection margin required for direct outdoor exposure at transformer yards, overhead line structures, outdoor substations, and utility infrastructure. Kits are available for XLPE, PVC, EPR, and PILC cable types across LV and MV voltage ranges, on copper and aluminium conductors.
- Voltage class LV and MV
- Cable types XLPE, PVC, EPR, PILC
- Conductor Copper and Aluminium
- Core configuration Single-core and Multi-core
- Weather resistance UV, rain, pollution, tracking
- Environment Outdoor — direct exposure
Why Outdoor Terminations Are Specified
Designed for sustained performance in exposed installations where weather, UV, pollution, and tracking risk demand more than a standard indoor termination system can provide.
Reliable Insulation and Stress Control
Heat-shrinkable stress control and insulation components manage the electrical field at the cable screen cutback — maintaining dielectric integrity and preventing partial discharge at the termination's most critical electrical interface, in service conditions that include sustained load cycling and transient overvoltages.
UV and Weather Resistance
UV-stabilised outer shed and jacket materials maintain mechanical and electrical properties after prolonged outdoor exposure — resisting the embrittlement, surface cracking, and loss of hydrophobic performance that degrades unrated materials in continuous outdoor service.
Anti-Tracking Performance
Outer shed and jacket materials are formulated with anti-tracking compound properties — suppressing the formation of carbonised conductive paths on the termination surface under conditions of moisture, contamination, and sustained leakage current that are characteristic of polluted outdoor environments.
Enhanced Creepage Distance
The shed geometry of outdoor termination kits increases the effective creepage distance along the termination surface — reducing leakage current under wet and polluted conditions and maintaining safe electrical clearance between the live conductor and the earthed cable screen below.
Multi-Cable Type Compatibility
Kit variants cover XLPE, PVC, EPR, and PILC cable insulation types — providing a single outdoor termination system for projects with mixed cable networks, without requiring separate product qualifications for each cable type encountered in the field.
Durable Long-Term Field Performance
Designed for the full service life of the cable installation — maintaining insulation integrity, shed performance, and weathering resistance across thermal cycling, mechanical vibration, and the sustained environmental stresses characteristic of unprotected outdoor cable infrastructure.
System & Performance Data
Reference data for engineering and procurement. Contact our technical team for full test reports, cable compatibility confirmation, or project-specific qualification data.
| Voltage class | LV (up to 1.1 kV) and MV (up to 33 kV) — kit selection based on system voltage |
|---|---|
| Compatible cable insulation types | XLPE, PVC, EPR, PILC — kit variant selected to match cable insulation type |
| Core configuration | Single-core and multi-core (3-core, 3.5-core, 4-core) |
| Conductor material | Copper and Aluminium |
| Stress control system | Heat-shrinkable stress control tubing — geometric field control at screen cutback |
| Insulation and shed material | Crosslinked polyolefin — anti-tracking grade, UV-stabilised, weather-resistant |
| Weather resistance | UV, rain, moisture, pollution, and temperature cycling — rated for continuous outdoor exposure |
| Anti-tracking | Yes — shed and jacket compound formulated to IEC 60587 tracking resistance requirements |
| Installation environment | Outdoor — direct exposure, transformer yards, overhead line structures, open substations |
| Installation method | Heat shrink — hot air gun application, no resin filling or cold-applied components |
| Operating temperature | –40°C to +90°C ambient (cable operating temperature governs system limit) |
| Applicable standards | IEC 60702, IEC 60587 (tracking resistance) — confirm per voltage class and cable type |
Where Outdoor Terminations Are Used
Specified wherever a cable end-connection is exposed to direct outdoor conditions — including UV, rain, pollution, and temperature extremes.
Outdoor Substations
LV and MV cable terminations at outdoor switchgear, disconnectors, and busbar structures in open-air primary and secondary substations — providing full weather resistance and anti-tracking performance at exposed cable entry points.
Overhead Line Terminations
Underground-to-overhead cable transition terminations at pole and tower structures — connecting underground distribution cables to overhead line conductors at exposed above-ground termination points subject to full environmental exposure.
Transformer Yard Connections
Cable terminations at the MV and LV cable boxes of outdoor power and distribution transformers — installed in transformer yards and outdoor switchyards where the termination is exposed to ambient conditions throughout the operational life of the installation.
Utility Distribution Networks
LV and MV outdoor cable terminations for DISCOM and utility distribution network infrastructure — including feeder pillars, ring main units with outdoor cable entries, and pole-mounted distribution equipment connections.
Renewable Energy Systems
Cable terminations for MV collector cables and grid connection cables at solar and wind energy installations — where outdoor exposure, UV intensity, and the absence of permanent shelter require full weather-grade termination performance.
Industrial Outdoor Installations
Outdoor cable terminations for power supply cables to industrial plant, external equipment buildings, and process facilities — where the cable entry point is outside the building envelope and directly exposed to the operating environment.
How to Select the Right Outdoor Termination
Seven parameters determine the correct kit for outdoor service. Confirm each before ordering — environmental exposure requirements differ from indoor applications and affect both kit type and creepage class.
-
01
System Voltage
Confirm the operating voltage — LV (up to 1.1 kV) or MV (3.3 kV, 6.6 kV, 11 kV, 22 kV, or 33 kV). For MV applications, also confirm the system earthing arrangement — solidly earthed, resistance-earthed, or unearthed — as this determines the required voltage rating of the kit (Uo/U or Um).
-
02
Number of Cores
Specify whether the cable is single-core or multi-core. For outdoor MV terminations, single-core cables are typically terminated individually with a phase kit per core. Multi-core cables use a kit designed for the core arrangement, including the outer glanding and earthing configuration at the cable entry.
-
03
Conductor Size
Confirm the conductor cross-sectional area in mm². Outdoor termination kits are sized to a conductor range — kit components are dimensioned to recover correctly over the cable insulation outer diameter for that conductor range. Provide the conductor size alongside the cable insulation outer diameter when enquiring.
-
04
Cable Insulation Type
Identify the cable insulation material — XLPE, PVC, EPR, or PILC. This is the critical parameter for stress control system compatibility. The kit stress control and insulation components are matched to the dielectric geometry of the cable insulation type. Always confirm from the cable drum label or test certificate — do not assume insulation type from cable age or construction.
-
05
Armouring
Confirm the cable armour type — SWA, STA, AWA, or unarmoured. Outdoor installations frequently use armoured cables for mechanical protection in buried or exposed runs. The armour type determines the gland arrangement and earthing method required within the termination, and affects which kit variant is supplied.
-
06
Environmental Conditions
Assess the severity of the outdoor environment at the installation site — coastal salt spray, industrial pollution, heavy rainfall, or high UV intensity each affect the required creepage distance and tracking resistance class of the termination. Heavily polluted or coastal sites may require a higher creepage class than a standard rural outdoor installation. Confirm site pollution level before specifying.
-
07
Installation Location
Confirm the specific installation point — transformer cable box, overhead line pole, outdoor switchgear bay, or open substation structure. The physical mounting arrangement and orientation of the termination affects the shed geometry required for effective rain shedding and the mechanical support arrangement for the cable and termination assembly.
For coastal, heavily polluted, or high-altitude outdoor sites, contact our technical team before finalising the creepage class and kit specification. Incorrect creepage distance selection is a common cause of premature outdoor termination failure.
Common Technical Questions
The fundamental electrical functions — stress control and insulation — are the same for both indoor and outdoor terminations. The difference lies in the environmental performance requirements of the outer components. An outdoor termination incorporates a shed system to increase the effective creepage distance along the termination body, anti-tracking compound materials to resist surface tracking under wet and polluted conditions, and UV-stabilised weatherproof materials for the outer jacket and shed. An indoor termination without these features would degrade progressively in direct outdoor exposure — developing tracking paths, surface erosion, and ultimately insulation failure under sustained outdoor service conditions.
Creepage distance is the shortest path along the surface of an insulator between two conductive parts at different potentials — in a cable termination, this is the path from the live conductor end to the earthed cable screen. Under wet and contaminated conditions, the surface of the termination becomes partially conductive, and leakage current flows along this path. If the creepage distance is insufficient for the contamination level, leakage current increases, causing dry band formation, surface arcing, tracking, and eventual flashover. Higher pollution severity levels — coastal, industrial, or heavily contaminated sites — require longer creepage distances, typically achieved through additional sheds on the termination body. IEC 60815 provides the standard pollution severity classification framework for site assessment.
Yes — outdoor termination kits are available for PILC (paper insulated lead covered) cables. PILC cable terminations require specific handling at the paper insulation preparation zone, including sealing against oil or impregnating compound migration from the paper insulation, which differs from the preparation procedure for XLPE or EPR cables. The kit components and installation sequence for PILC are matched to this requirement. Always confirm the cable construction — including whether the cable is mass-impregnated or oil-filled — when ordering a termination kit for PILC cables.
Heat shrink outdoor terminations are a well-established technology for LV and MV cable end-connections and have been in service on utility and industrial networks for decades. For the voltage classes covered by Western Cablex outdoor termination kits, heat shrink systems provide a reliable, field-proven performance record. The key advantages over traditional porcelain terminations are the compact installation profile, absence of oil filling, faster installation time, and resistance to seismic and mechanical vibration. For higher voltage classes above the MV range covered by heat shrink systems, pre-moulded or composite insulator terminations may be specified instead — but for LV and MV distribution cable applications, heat shrink outdoor terminations are the standard industry solution.
A calibrated industrial hot air gun is the recommended installation tool for outdoor termination kits — providing controlled, consistent heat output for uniform recovery of stress control and insulation components. Cable preparation tools, a torque-controlled crimping tool for the conductor lug, and cleaning materials specified in the installation instruction are also required. For outdoor field installations, a temporary weatherproof enclosure or tent should be erected around the work area during installation — residual moisture on the cable surface during heat shrink application can cause steam blistering beneath the tubing and compromise the termination. Confirm that the cable end is dry before beginning installation, particularly after wet weather or on cables recently removed from buried conditions.
Yes. Outdoor termination kits are available for both copper and aluminium conductor cables. For aluminium conductors, specify bi-metallic lugs compatible with the terminal material at the connection point — aluminium-to-copper connections at transformer terminals and switchgear require bi-metallic or tinned-copper lugs with an appropriate anti-oxidant compound at the crimp interface to prevent galvanic corrosion. The heat-shrinkable components of the termination kit are compatible with both conductor materials. Specify the conductor material when ordering to confirm the correct lug type is supplied with the kit.
Need Help Selecting the Right Outdoor Termination System?
Speak with our technical team for sizing, application guidance, and product recommendations.