Mobile Power Grounding Unit (MPGU)

The A-2-Sea Mobile Power Grounding Unit (MPGU) provides power safety and the ability to work on potentially live submarine and terrestrial powered cable systems during installation and repair.

The equipment facilitates the repair of non-live segments of a cable system which may become live for various reasons. By removing the need to switch off the whole system to undertake a repair, there is a significant reduction in loss of revenue during the downtime.

The MPGU equipment is low-cost, modular, lightweight and transportable. It can be used on barges and vessels of opportunity when installing or repairing submarine cables or installing and repairs from the beach to the terminal station and practically any location in between. Equipment is available to measure the ground resistance of the available earth: system, station or temporary earth created for the MPGU repair.

The MPGU's design is inherently flexible, portable, and adaptable, allowing it to accommodate the entire spectrum of cable types found in contemporary systems. It offers system installers, owners, and planners cost-effective installation options, essential in today's competitive market. Rapid deployment and operation mean that work can be executed swiftly and efficiently, greatly minimising disruption to existing cable systems. This serves to reduce costly operational downtimes and ensures that vital communication links remain largely uninterrupted.

 Key Features MPGU

 Key Features

  • Qualified for cable systems up to 15kV.
  • Qualified for 400A short circuit currents.
  • Qualified for 10A for 48 hours of continuous current.
  • 100mA trip current sensor guarantees safety during operation.
  • Modular and portable: equipment can be hand-carried and complies with airline regulations for ease of transport.
  • Compatible with all switchable branching unit systems, providing versatility across different cable networks.
  • Features an internal battery capable of running up to 48 hours uninterrupted, with an external backup battery that adds another 24 hours of operation and the capability to connect to a generator or external power source for extended use.
  • User-friendly procedures and interfaces ensure that safety protocols are clear and easily followed in the field.
  • Minimal requirements for Personal Protective Equipment (PPE) significantly accelerate the repair process without adding risk or compromising safety.
  • Low maintenance design ensures reliability and reduces long-term costs.


qualified for systems up to

48 hours

internal battery can run up to


short circuit currents qualified for 

Key Benefits

  • Versatile: Highly adaptable grounding system designed for repairs of all cable type
  • Portable: The compact size and modularity of the equipment facilitate rapid deployment to the repair site, allowing for the immediate commencement of maintenance operations.
  • Cost-effective logistics: Only essential modules needed for the specific repair task need to be transported, cutting down on excess baggage and thereby reducing shipping expenses.
  • Safety-ensured isolation: The MPGU allows for precise targeting of sections within a branched system for shutdown. This feature ensures the isolated section remains non-energised to ensure personnel are protected and prevent accidental re-energisation during repair operations.
  • Reliable Power Provision: The long-lasting internal battery ensures sufficient power is available to complete repairs without interruption. This continuity extends the capability of field technicians to work with confidence, knowing that the power supply will be consistent throughout the repair process. Additionally, utilising an external backup battery or generator ensures that power will not be a constraint even in the most challenging of environments.
  • Industry Proven: A-2-Sea boasts over 25 years' proven track record with our equipment, components, processes, and procedures in the industry, setting a benchmark for performance and dependability. This wealth of experience has not only refined our product offerings but has also ingrained a deep understanding of client needs, enabling the provision of tailored solutions that stand the test of time and demand.
  • Training Resources: Training materials suitable for non-native English speakers.

Compact and highly portable

Versatile and designed for repairs of all cable types

User-friendly with clear safety protocols


Outside casing specifications: 560mm W, 230mm H and 350mm D

Internal battery specifications: 360mm W, 170mm H and 290mm D

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