Protecting Critical Infrastructure with Smarter Earthing Solutions
At Osiris Group, we specialise in the design, installation, and testing of specialist High Voltage (HV) earthing systems for substations, renewable energy sites, energy storage facilities, and critical infrastructure.
Unlike standard lightning protection earthing, HV earthing must safely manage sustained fault currents, protecting personnel, equipment, and operational continuity in the event of electrical faults or surges.
Our solutions are designed around real-world site conditions, fault current magnitudes, and system resilience — ensuring compliance, safety, and long-term asset protection.
Why Specialist HV Earthing Matters
Safely dissipates high fault currents during electrical faults
Protects against dangerous touch, step, and transfer voltages
Essential for substation compliance, energy sector resilience, and safe grid connection
Supports renewables, BESS (Battery Energy Storage Systems), and EV infrastructure expansion
Reduces the risk of catastrophic failure and insurance claims
A properly designed HV earthing system isn’t just a technical requirement — it’s a critical part of operational risk management and public safety.
Types of Specialist HV Earthing Systems We Design and Install
Earth Mat Systems
Large buried copper or steel grids installed under substations to control touch and step potentials.
Radial Earthing Systems
Buried conductors extending outward from fault sources to dissipate energy over a wider area.
Earth Rod Arrays
Driven rods used where deeper soil strata provide lower resistivity than surface layers.
Combined Foundation and Site Earthing
Utilising foundation rebar (pile caps, slabs) bonded into the overall earth system — essential for mast bases and building-integrated designs.
Ring Earths
Protective perimeter conductors installed around critical equipment or buildings.
Dedicated BESS and Solar Earthing
Separate but coordinated earth systems for large battery storage, inverters, solar farms, and associated high-voltage plant.
Cross-Bonding and Surge Integration
Ensuring interconnected systems avoid dangerous potential differences during faults or external surge events.
Testing and Validation Services
Fall of Potential Testing Verifying true earth resistance across installed systems.
Slope Method Testing Alternative method where space constraints prevent standard testing.
Dead Earth Testing Simulating fault conditions for resistance measurements in isolated earth systems.
Soil Resistivity Surveys Accurate profiling of ground conditions for optimal design, avoiding over- or under-engineering.
Continuity and Bonding Checks Confirming correct installation and integrity of all system components.
Proven Experience in Critical Environments
Osiris Group has delivered specialist HV earthing projects for:
Major Substations supporting new housing and commercial developments
Solar Farms (multi-MW scale PV installations)
Battery Energy Storage Systems (BESS)
EV Charging Infrastructure rollouts
Water Treatment Plants
Industrial and Logistics Facilities (including Amazon Distribution Sites)
Sports Stadia and Event Infrastructure
Where serious fault current management is essential, Osiris delivers.
Smarter Earthing, Safer Outcomes
At Osiris Group, we don’t rely on guesswork or templates. Every HV earthing system we deliver is:
Site-specific
Standards-compliant
Fully tested and validated
Designed for resilience and operational safety
We work to BS EN 50522, BS 7430, IEEE 80, and applicable DNO/IDNO earthing standards — delivering true professional assurance for your infrastructure.
