High Voltage

Systems

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High Voltage systems

Evans Electrical delivers high voltage (HV) systems for environments where electrical safety, resilience and operational continuity are critical. Our high voltage works are undertaken with a disciplined, safety-first approach, supported by robust procedures, experienced personnel and rigorous planning.

High voltage infrastructure presents significantly increased risk compared to low voltage systems and demands specialist knowledge, formal controls and absolute adherence to safety protocols. We provide end-to-end HV services, ensuring systems are designed, installed, tested and commissioned safely and in full compliance with current regulations and industry best practice.

Specialist HV Design and System Engineering

High voltage systems must be carefully engineered to manage fault energy, operational loading, system resilience and future capacity. Our in-house teams coordinate closely with clients, consultants and network operators to develop HV solutions that meet technical, safety and operational requirements.

Our HV services include:

HV cable installation, termination and jointing
Primary and secondary substations
HV switchgear and ring main units (RMUs)
Transformers and associated protection equipment
Earthing systems and earth grid installation
Interface works with network operators

All HV systems are designed to support safe operation, effective isolation and maintainability. Particular attention is given to access, segregation, labelling, arc-flash risk reduction and operational safety.

Installation, Testing and Commissioning

HV installation demands absolute precision and control. All works are undertaken by authorised and competent personnel, operating under formal HV safety rules and procedures.

Installation activities are carefully sequenced, with strict control of work boundaries, plant status and access permissions. Following installation, systems undergo structured testing and commissioning to verify integrity, performance and safety prior to energisation.

Testing and commissioning activities include:

Pre-energisation inspection and verification
Primary and secondary injection testing
Functional testing of protection systems
Phased energisation and system proving
Full documentation and certification

Commissioning is carried out in close coordination with all stakeholders to ensure systems are brought into service safely and without unintended impact on existing infrastructure.

Electrical Safety Rules and HV Control Procedures

Electrical safety is paramount in all high voltage works. We operate under formal HV electrical safety rules, ensuring hazards are identified, risks are controlled and responsibilities are clearly defined.

Our HV safety framework includes:

Authorised Person and Competent Person roles
Permit-to-Work and Sanction-to-Test systems
Formal isolation, earthing and locking-off procedures
Controlled access to HV environments
Clear demarcation of work boundaries
Verification of dead prior to work commencement

All personnel involved in HV works are trained, authorised and regularly assessed to ensure competence is maintained. These procedures protect our teams, client personnel and the integrity of the HV network.

Live Environment and Critical Power Management

HV works are often undertaken in live or operational environments where continuity of supply is essential. We have extensive experience managing HV installations, diversions and upgrades within such settings, including phased energisation and planned outages.

Careful planning, communication and coordination ensure that outages are minimised and risks are tightly controlled. Where required, temporary supplies and redundancy measures are implemented to protect critical services during HV works.

Why Evans Electrical?

Why choose Evans Electrical for high voltage systems?

High voltage work demands experience, discipline and robust safety control. We deliver HV systems through trained, authorised teams operating under formal electrical safety rules.