Control, Operation and Maintenance Agreements (COMA)

Our COMA service provides structured, ongoing responsibility for the safe operation and maintenance of your HV and LV infrastructure. Delivered by Senior Authorised Persons (SAPs), our engineers work to PWR Serves formalised safety rules, permit systems, and switching procedures. Agreements are tailored to site conditions, asset risk profiles, and maintenance requirements — ensuring compliance with the Electricity at Work Regulations 1989 and supporting continuous, auditable control of plant.

• Provision and adherence to site-specific safety rules & permit-to-work systems

• 24/7 operational response and switching capability

• Asset condition monitoring and planned maintenance  

• Documentation for audits, insurance and regulatory inspections

• Competent Person and SAP cover for routine and emergency work

High & Low Voltage Network Design

We design HV and LV distribution networks in line with IEC, BSI and client-specific performance criteria. Our in-house engineers collect and utilise load data, fault level analytics, discrimination studies, and future expansion planning to develop efficient, safe, and scalable systems. All designs are backed by structured documentation, CDM compliance, and handover-ready technical packs.

• HV ring main and radial system design

• LV panelboard and distribution layout planning

• Load calculations and protection coordination

• Earthing system design and fault level assessment

• CAD schematics, network studies, and installation drawings

Power System Engineering

Our power engineering services address system integrity, protection, and optimisation. We offer system modelling, fault investigations, discrimination studies and advice on resilience, redundancy, and efficiency. All work is undertaken by experienced engineers trained in system theory and real-world application, with formal risk assessments and SSoW documentation for on-site tasks.

• Protection grading and coordination studies

• Arc Flash studies and reporting

• Load flow and short-circuit analysis

• Transformer sizing and network resilience studies

• Earthing design and fault current safety reviews

Installation and Commissioning

We carry out HV and LV installations to strict safety standards, with end-to-end project control and commissioning services. All installation work is undertaken by competent electricians and jointers working under permits, RAMS, and isolations as required. Final testing and commissioning follows best industry practices, cross-referencing site-specific and manufacturers procedures, ensuring all systems are energised safely and correctly.

• LV panel and distribution installation

• HV switchgear and transformer installation

• Functional testing, insulation resistance, and fault clearance checks

• Commissioning reports, test sheets, and O&M documentation

• Temporary works and phased installation support

24/7 Emergency Call-Out

Our engineers respond rapidly to electrical faults across LV and HV systems — using calibrated test equipment and proven methods to locate, isolate, and resolve issues safely. All works are controlled under risk-assessed procedures and, where applicable, live working or isolation protocols. We provide clear reporting, root cause identification, and immediate remedial action where possible.

• Cable fault location  

• Intermittent fault diagnostics

• Switchgear and protection relay fault tracing

• Isolation and re-energisation procedures

• Post-fault reports and system recommendations

‍

‍