HV Junction Boxes & Electrical Enclosures for High Voltage Systems

Published 18 Mar 2026

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 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.