HV Junction Boxes & Electrical Enclosures

Junction Boxes for High Voltage Power | HV

Power Connection & Termination Solutions for 11kV 33kV 66kV Networks

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.

The range includes specialist HV Junction Boxes designed for 11kV, 33kV, 66kV and higher voltage applications, supporting power transmission, busbar distribution, subsea termination and fibre optic integration.

Manufactured from robust materials such as stainless steel and corrosion-resistant alloys, these HV Electrical Enclosures are suitable for onshore, offshore, subsea and process facilities where reliability, ingress protection and certification compliance are critical.

The comparison table below provides an overview of our HV Junction Boxes & Electrical Enclosures, summarised by voltage range, application, enclosure type and product range. It is designed to help engineers, contractors and project specifiers quickly identify the most suitable high-voltage enclosure solution based on operating voltage, current requirements and installation environment.

Each product range supports specific use cases, from 11kV and 33kV industrial distribution through to 66kV grid infrastructure, high-current busbar systems up to 3000A and submersible or fibre-integrated enclosures for offshore and specialist applications. Direct links are provided to detailed product pages for full technical specifications and compliance information.

Selection Table for High Voltage Junction Boxes

Voltage Range	Typical Applications	Junction Box & Enclosure Type	Product Range
11kV – 33kV	Power generation, industrial distribution, utilities, hazardous areas	11kV & 33kV HV Junction Boxes
These high-voltage electrical enclosures and junction boxes provide secure termination and interconnection of medium-to-high voltage cables (MV HV) while maintaining electrical safety, ingress protection and long-term durability in harsh operating environments.
11kV	Modular power distribution & busbar segregation	HV High-Voltage Busbar Box
Designed for high-current power distribution where multiple feeders or connections are required within a compact electrical enclosure. These  enclosure solutions support controlled power routing, fault containment and efficient maintenance access in substations and industrial facilities.
Up to 45kV	High-current distribution, heavy industrial processes, power plants	High-Power 3kA HV Junction Boxes
Designed for extreme electrical loads, high-power HV junction boxes support currents up to 3000A (3kA). These enclosures are typically specified for heavy industrial processes, power generation plants and specialist distribution systems where thermal management and fault rating are critical.
66kV	Grid infrastructure, substations, renewable energy transmission	66kV HV Junction Boxes
66kV junction boxes are engineered for high-voltage transmission and grid-level applications, offering enhanced insulation, creepage distances and fault ratings. These enclosures are commonly used in substations, renewable energy projects and critical infrastructure.
Subsea / Submersible	Offshore energy, marine systems, subsea cable termination	Submersible HV Electrical Enclosures
Submersible electrical enclosures are designed for underwater and subsea cable termination, offering long-term sealing, corrosion resistance and pressure tolerance. These solutions are ideal for offshore energy, marine infrastructure and subsea power distribution systems.
Fibre Optic Integration	Data transmission, monitoring, control & communications	Fibre Optic Termination Enclosures
Fibre optic termination enclosures provide secure housing for optical fibre connections within HV and industrial networks. These enclosures protect sensitive fibre systems while supporting data, monitoring and communication integration alongside power infrastructure.