Cable Joints & Terminations HV

HV Junction Boxes & Electrical Enclosures for High Voltage Systems

HIGH VOLTAGE JUNCTION BOXES & ENCLOSURES

When high-voltage power distribution and cable termination are required, safety, enclosure integrity and long-term reliability are critical.

HV Junction Boxes and Electrical Enclosures manufactured by Abtech are engineered for the safe distribution, cable termination and protection of high voltage power systems in industrial, utility and hazardous area environments.

In this range, HV junction boxes & electrical enclosures support 11kV, 33kV, 66kV and specialist high-current applications, providing dependable solutions for power transmission, distribution, subsea termination, busbar systems and fibre optic integration.

These enclosures are engineered for harsh operating conditions and are suited to applications requiring certified protection, robust stainless-steel construction, high ingress protection and safe high-voltage cable termination.

Need Help Selecting The Right HV Junction Box?

Choosing the correct high-voltage enclosure depends on operating voltage, current loading, hazardous area classification, cable size, termination arrangement and installation environment. Speak to our team for guidance on the most suitable HV junction box or electrical enclosure for your application.

Why HV Junction Boxes Are Important

• Provide safe termination and interconnection of high-voltage power cables
• Protect critical electrical connections in demanding environments
• Support reliable power distribution in industrial and utility networks
• Help maintain ingress protection and long-term enclosure integrity
• Enable compliant installation in hazardous and non-hazardous locations

Designed For High Voltage Safety, Protection & Reliability

HV junction boxes must do more than simply house cable terminations. In modern power systems they also help:

• Protect live HV terminations from moisture, dust and contaminants
• Support safe connection of 11kV, 33kV and 66kV systems
• Provide robust enclosures for onshore and offshore use
• Accommodate multiple conductors and flexible connection layouts
• Support hazardous area compliance where explosive atmospheres are present

These requirements are essential where high-voltage networks operate in challenging environments such as substations, process plants, offshore platforms, renewable energy sites and industrial facilities.

11kV & 33kV Junction Boxes

11kV & 33kV junction boxes are designed for safe high-voltage cable termination in demanding industrial, offshore and hazardous area environments.

• Suitable for 11kV and 33kV cable termination applications
• Available for hazardous area installations
• 316L stainless-steel construction
• Ingress protection up to IP66 / IP67
• Supports reliable HV cable termination

View 11kV & 33kV Junction Boxes

HV High Voltage Busbar Box

HV high voltage busbar boxes provide a compact and dependable solution for controlled power routing and segregation in specialist electrical installations.

• Compact enclosure design
• Supports busbar-based power distribution
• Suitable for industrial and utility applications
• Helps organise multiple high-power connections
• Designed for dependable enclosure performance

View HV High Voltage Busbar Box

High Power Current Junction Box

High power current junction boxes are built for demanding electrical systems requiring robust enclosure construction and current ratings up to 3000A.

• Current ratings up to 3000A
• Heavy-duty enclosure design
• Suitable for demanding industrial service
• Supports high-current power distribution
• Designed for safe and reliable power transfer

View High Power Current Junction Box

66kV Junction Boxes

66kV junction boxes are designed for high-voltage grid, offshore and renewable energy applications requiring robust protection and reliable cable termination.

• Designed for 66kV high-voltage systems
• Suitable for substations and infrastructure projects
• Heavy-duty enclosure construction
• Supports large conductor sizes
• Built for demanding operating environments

View 66kV Junction Boxes

Submersible Electrical Enclosures

Submersible electrical enclosures are designed for subsea and underwater cable termination where sealing integrity and corrosion resistance are critical.

• Suitable for subsea and underwater applications
• Designed for long-term environmental protection
• Corrosion-resistant enclosure construction
• Supports specialist cable termination requirements
• Suitable for marine and offshore projects

View Submersible Electrical Enclosures

Fibre Optic Termination Enclosures

Fibre optic termination enclosures provide secure protection for communication and data connections used alongside high-voltage electrical infrastructure.

• Supports fibre optic integration
• Protects communication terminations
• Suitable for monitoring and control systems
• Designed for industrial and specialist environments
• Can be integrated with wider HV infrastructure

View Fibre Optic Termination Enclosures

Applications For HV Junction Boxes & Electrical Enclosures

• Power generation facilities
• Industrial power distribution
• Utility and substation projects
• Offshore oil, gas and marine installations
• Renewable energy infrastructure
• Hazardous area process plants
• Subsea cable termination systems
• Control, monitoring and fibre-integrated installations

Choosing The Right HV Junction Box

Selecting the correct enclosure depends on:

• Operating voltage and system design
• Current loading and conductor size
• Hazardous area classification
• Ingress protection requirements
• Onshore, offshore or subsea installation environment
• Need for busbar systems, fibre integration or specialist compartment layouts

The correct HV junction box helps ensure safe cable termination, dependable network performance and long-term enclosure integrity in critical electrical infrastructure.

abtech HV junction boxes

ABTECH manufactures high-voltage junction boxes and electrical enclosures for industrial, utility, offshore and hazardous area applications. The range includes 11kV, 33kV and 66kV junction boxes, high-current busbar enclosures, submersible termination enclosures and fibre optic integration solutions designed for demanding high-voltage power systems.

Thorne & Derrick are specialist distributors of HV junction boxes & electrical enclosures in the UK and for export projects, supporting power transmission, offshore energy, industrial processing, substations and hazardous area installations with expert technical support and product selection guidance.

Compound Box Filling for MV End Box Refurbishment: Why the Dielectric Choice Matters

Compound Box Filling

Compound end boxes rarely get attention — until one fails.

Across ageing networks, replacement of compound-filled end boxes is becoming more frequent, particularly where original insulation systems have deteriorated and air insulation is not practical because separation distances are limited. In these situations, the replacement dielectric is not a minor detail; it is central to long-term reliability.

When specifying compound box filling for refurbishment works, the goal is not simply to refill the box. The dielectric has to maintain insulation performance over time, tolerate operational movement, and resist the conditions that caused deterioration in the first place.

At Lovink Enertech, LoviSil® provides a purpose-engineered solution for compound end box refurbishment. Unlike curing alternatives, LoviSil® remains permanently fluid, allowing it to move with conductor expansion and contraction under load. Solidifying compounds cannot accommodate this movement; over time they form voids, and voids lead directly to partial discharge and eventual breakdown.

A Practical Maintenance Advantage

Re-entry is simple. Release the bolts at the base of the faceplate and the LoviSil® drains into a container. No cutting. No effort. Just drain and go.

For asset owners, this provides a cost-effective alternative to full end box replacement while restoring dielectric performance and extending service life.

Recent failures involving replacement compound-filled end boxes highlight a recurring issue: choosing the wrong dielectric solution only delays the problem.

Overview of the Lovink Cable Joint Range

Alongside solutions for compound box filling and end box refurbishment, Lovink offers a broad range of medium voltage cable joints designed for ageing infrastructure, upgrades, repairs and new connections across 11kV and 33kV networks.

Below is an overview of the 11 Lovink joint categories, each developed to suit specific installation and network requirements.

Lovink MV Cable Joints

A complete range of medium voltage cable jointing solutions for repairs, transitions, upgrades and new underground cable connections.

Transition Cable Joints For connecting legacy paper-insulated cables to modern polymeric MV cables. Learn more	Straight Cable Joints For straight-through MV cable connections requiring continuity and insulation reliability. Learn more
Stop-End Joints A sealed solution for terminating underground MV cables safely and securely. Learn more	Branch Joints Designed to create branch connections within MV distribution networks. Learn more
Cable Repair Joints Ideal for repairing damaged cable sections without replacing the full route. Learn more	Extended Resin Cable Joints Provides extra sealing and bonding space for more demanding installations. Learn more
Feed-In Cable Joints For connecting new power sources into existing underground MV cable systems. Learn more	Loop Cable Joints A compact solution for internal looping arrangements in restricted spaces. Learn more
Oil Refill Cable Joints Designed for paper-insulated lead-covered cables where oil retention is essential. Learn more	Crossbonding Cable Joints Used to help manage sheath losses and improve MV cable system efficiency. Learn more
Compact Cable Joints A space-saving MV joint solution for ducts, trenches and compact installations. Learn more	Full Lovink Range View the full Lovink cable joint range for MV refurbishment and connection projects. View range

Conclusion

Compound-filled end boxes often only get attention when something goes wrong. But the choice of compound box filling has a direct impact on insulation performance, moisture resistance, re-entry and long-term reliability.

Where refurbishment is the preferred route, Lovink’s LoviSil® offers a practical and technically robust alternative to full end box replacement. Combined with Lovink’s wider MV joint portfolio, it supports utilities, contractors and network operators working to extend asset life and improve resilience across ageing cable systems.

Slaters Electricals | UK’s Largest Stock of New & Refurbished Power Distribution Equipment

Since 1923.

• uploaded by Chris Dodds | Thorne & Derrick Sales/Marketing Manager

Slaters Electrical are experts in the provision of LV MV HV Power, Distribution & Cast Resin Transformers, Switchgear, Installation, Maintenance, Site Services & Spares.

The Slaters Electricals installation division primarily operates from a dedicated base in Sheffield, with additional skilled engineers based at their Head Office and main works in Newcastle upon Tyne.

From these two sites Slaters Electricals offers a range of HV MV and LV installation and cable work services covering the whole of the UK.

➡ Contact t: 44 (0)191 414 2916 e: [email protected]

Switchgear & Transformers

MV HV Medium & High Voltage Power

The following photographs are published with the kind permission of Slaters Electricals and demonstrate their leading technical skills, knowledge and expertise in providing turnkey Medium & High Voltage Power Distribution solutions.

• 2no New 2000kVA 11kV/433V Midel Filled Tier 1 Distribution Transformers + LV Boxes to accommodate Schneider Canalis Busbar Trunking System
• New 7 Section Schneider Ringmaster Switchboard consisting of 5no 630A CE6-T4/21 & 2no 200A CE2-T2/21 Circuit Breakers
• 30V Battery Tripping Unit
• HV Cable Works & Cable Containment

All MV HV Power Distribution Switchgear & Transformers are checked, refurbished and tested by skilled time-served engineers prior to delivery.

• 11kV/110V AC Voltage Transformer fixed and moving portions for GEC VMX Switchgear despatched to a UK DNO on a same-day turnaround following a catastrophic failure in a distribution network Substation. Slaters Electricals provide a rapid-response to emergency power restoration enabled by extensive stocks of legacy and current technology switchgear and transformer spare parts at their 100,000 square foot facility.

Emergency deliveries of Power Distribution & Switchgear are achieved nationwide supported by the largest UK spares stocks and same day “load and run” delivery fleet.

• 2no refurbished Schneider GenieEvo VC2 200A Circuit Breakers after completing tests at Slaters Electricals – the range of refurbished switchgear stock includes most current production types including Schneider GenieEvo & Ringmaster, Hawker Siddeley/Brush Eclipse, ABB UniGear & ABB SafePlus as well as the widest available range of legacy UK manufactured types including Alstom, Brush, GEC, Long & Crawford, Reyrolle, South Wales, Yorkshire etc. Whether you need a spare part, a single extension panel or a full replacement switchboard, you can contact their Sales Engineers.

• New 2000kVA 11kV/433V Tier 1 Distribution Transformer complete with close coupled Schneider CN2-T1 200A Circuit Breaker and refurbished 3200A ABB SACE ACB Feeder Cabinet, contained within a custom fabricated tranformer bund. Slaters Electricals site services division attends site to complete MV HV & LV cable works and containment plus  installation-commissioning as part of a full supply and install MV Power Distribution solution including GRP enclosure and battery tripping unit.

2.5MVA 11000/433V Dyn11 Cast Resin MV Medium Voltage Transformers

2500kVA 11kV/433V Tier 1 Distribution Transformer

Fully Refurbished 11kV Eclipse 20ft Containerised Switchboard | Hire Options

THORNE & DERRICK

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage voltage power systems:

• Slip-on Cable Terminations
• Cold-shrink Cable Terminations
• Heat-shrink Cable Terminations
• Cable Joints – Heat & Cold-shrink
• Separable Connectors (Euromold)
• Surge Arresters & Switchgear/Transformer Bushings

Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV HV 

Pioneering Safety in Onshore & Offshore Wind: First Graduates of New GWO High Voltage Cable Pulling Standard

The Wind Academy

The Wind Academy, the UK leading facility delivering GWO and Technical Trade Training Courses, has marked a major milestone in onshore and offshore wind technician training with the successful delivery of the first-ever GWO High Voltage Cable Pulling (HVCP) Training Standard.

Hosted at their brand-new Training Facility at the Port of Blyth, this pilot programme has produced some of the very first professionals in the world to gain certification under this innovative new standard — developed by the Global Wind Organisation (GWO) to boost safety, reduce cable damage, and improve operational uptime across the wind sector.

What is the HVCP Module?

The HVCP module forms part of the new GWO High Voltage Training Standard and equips participants with the skills, safety awareness and confidence to carry out high voltage cable installation both onshore and offshore.

Aimed at commissioning and service technicians, this standard supports work in HV operations or cable pulling under a Safe System of Work (SSOW). The HV Standard has been highly requested by many of the leading members of the Global Wind Organisation with input from Cubico Sustainable Investments, ENERCON, ENGIE, GE Vernova, Nordex Group, Northland Power Inc., Ørsted, RWE, Siemens Gamesa, SSE Renewables and Vestas.

Why This Matters for the Industry

By standardising HV cable pulling procedures and ensuring rigorous training, the new GWO HVCP standard helps:

• Prevent costly cable damage during installation

• Protect worker safety in challenging offshore conditions

• Maintain uptime and reliability of wind farm assets

HV Jointer Training at the Wind Academy

The Wind Academy also provides brand-specific Cable Termination Courses for leading cable accessory manufacturers including Nexans (Euromold), Pfisterer (Connex), 3M Electrical, and NKT.

Thorne & Derrick

Leading Specialist Electrical Distributor to the Global Renewable Energy Industry

Thorne & Derrick supply High Voltage Cable Accessories, Jointing Tools & Power Distribution Equipment up to 66kV – we hold several Framework Supply Agreements with international energy providers, OEM’s and High Voltage Power Energy Companies.

From the largest stocks in the UK & EU we supply global projects with HV Cable Accessories to energise projects – this includes Nexans Euromold, Pfisterer Connex & 3M Cold Shrink Separable Connectors, Joints & Terminations at 11kV/33kV/66kV.

This is complemented by the most extensive stocks of Cable Preparation, Cutting, Crimping & Spiking Tools for insulation, screen, sheath removal of MV & HV cables including Alroc, Ripley, Hivotec, Cembre, Klauke, Boddingtons and PENTA.

Supplying Cable Termination, Jointing, Pull-in & Electrical Equipment up to 66kV

Cold Shrink Glands for MV HV Cables

How to Install SPS 180 & SPS 193 Cold Shrink Cable Glands

To suit 3 Core SWA Armoured XLPE Cables, 3.6kV (3.3kV) to 36kV (33kV)

Reference Numbers: SPS 180(CS) and SPS 193(CS)

In this Post, we present a step-by-step installation guide for the SPS 180(CS) and SPS 193(CS) Cold Shrink ‘Bolt-On’ Type Cable Glands. These “top-hat” glands are designed to connect and gland 3-core armoured XLPE cables from 3.6kV to 36kV, providing a reliable and easy-to-install solution for Cold Shrink termination and are distributed by Thorne & Derrick.

Note:- Fig 1 shows one possible cable gland configuration, in some situations it may be necessary to position the 3 leg heat shrink boot body below the gland plate to gain space within the cable box. If cable is non armoured, additional strain may be put on the heat shrink tube to ensure cable is supported by cable cleats to provide additional strain relief.

Step-by-Step Installation Guide

1. Cable Preparation

• Before opening up the armour wires, ensure the cold shrink tubes and the two worm drive clamps are in position.

2. Armour Wires

• Open up the wire armours as shown in Fig 2.

3. Cable Gland Body

• Slide the metal cable gland body over the cable.

  Note: The cable gland body itself can, in most cases, be positioned after completing the cable termination.

  For Steel Tape Armoured Cable:
  Prepare to the same dimensions shown in Fig 1 and follow section 7 (see below).

  Configuration Tip:
  Fig 1 shows one possible configuration. In some cases, you may need to position the 3-leg boot body below the gland plate to gain space within the cable box.

  Non-Armoured Cable Warning:
  Additional strain may be placed on the shrink tube. Ensure the cable is supported by cable cleats to provide strain relief.

4. Final Connections

• Complete the final connections of the cable termination before bolting the cable gland body in place.

5. Bend Armour Back

• Bend the armours back over the cable gland body.

6. Clamping

• Using the worm drive clamps, connect the cable armours and screen earth braids to the cable gland body as shown in Fig 3. Ensure the cable clamps are tight.

7. Cover Edges

• Cover any sharp edges and the clamp buckles with PVC tape.

  If Steel Tape Armoured:
  Unwind the electrical tape below the bottom of the cable gland, re-wrap around the cable gland body, and secure with worm drive clamps.

8. Moisture Seal

• To provide a moisture seal, stretch and apply a turn of grey mastic tape around:

  • The top of the metal cable gland body.

  • The outer cable jacket.

This ensures that the cold shrink tube will recover properly onto the tape.

9. Apply Cold Shrink

• Position the cold shrink tube.

• Begin pulling the plastic spiral carefully.

  • Do not pull the spiral straight.

  • Wrap it around the cable to avoid snagging.

10. Secure Ends

• Once fitted, apply the provided black EPR tape at both the top and bottom of the tube.

Figures for Reference

• Fig 1: Base plate and initial configuration

• Fig 2: Wire armour open-up

• Fig 3: Clamp setup with screen earth braid

• Fig 4: Final assembly with cold shrink and sealing tapes

Cable Glands Distributed from Stock by Thorne & Derrick | the 501/453 range of Universal Cable Glands manufactured by Hawke are suitable for the mechanical retention, glanding and termination of LV MV HV Power Cables with steel wire armour, steel wire braid or steel tape armour.

Shrink Polymer Systems heatshrink cable joints and terminations suit all types of MV-HV electrical cables (single or multi-core) with or without armour or lead sheaths – zero halogen and fire resistant cable joints are also available.