The network strategy should be holistic across HV and LV. Best practice pushes the first single point of failure out toward the final circuits as far as practicable for the critical nature of the facility, using alternative power supplies and alternative cables or routes, both switchable automatically with manual bypass. All stakeholders and the Group should contribute to the risk assessment and agree the level of risk mitigation. Resilience is expressed as N+1 (total requirement plus one resilient unit). Growth (typically 3% to 6% a year) should be agreed before sizing the secondary supply; secondary supply provision should follow the risk grades, with 100% load provision for higher grade areas.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.