IEC 60364-8-1:2019

Overview

IEC 60364-8-1:2019 - Low-voltage electrical installations, Part 8-1: Functional aspects - Energy efficiency - provides requirements, measures and recommendations for designing, erecting and verifying low-voltage electrical installations to optimize overall electricity use. The standard covers new installations and modifications, including local energy production and storage, and frames the electrical installation design within an energy efficiency management approach to achieve the best functional service for the lowest electrical energy consumption and acceptable availability and cost balance.

This edition introduces revised Annex B (assessment method), updated energy assessment requirements (Clause 4.2), enhanced inputs from loads/sensors/forecasts (Clause 8.3), and new definitions.

Key topics and technical requirements

• Energy efficiency assessment: methods and action plans to evaluate an electrical installation’s energy performance (see Annex B).
• Design principles for low-voltage installations that optimize efficiency while preserving safety and energy availability.
• Load profiling and determination: identification of zones, usages and meshes to inform load management and capacity planning.
• Transformer and switchboard siting: guidance (barycentre and routing approaches) to minimize losses and cable lengths.
• Loss minimization: attention to voltage drop, conductor sizing, transformer efficiency and wiring losses.
• Local generation and storage: integrating on-site production and storage for efficient multi-source management with the grid.
• Energy efficiency and load management systems (EEMS): functional requirements, inputs from loads/sensors/forecasts, communication and data logging.
• Demand response and mesh management: strategies for load control, priority handling and managing energy availability/price signals.
• Monitoring, verification and lifecycle maintenance: performance monitoring, data management and continuous improvement actions.

Practical applications and users

Who uses IEC 60364-8-1:2019:

• Electrical designers and consulting engineers specifying efficient LV distribution and transformer placement.
• Energy managers and facility managers implementing energy efficiency programs and EEMS.
• Installers and commissioning teams validating wiring losses, voltage drops and measurement strategies.
• Building owners, infrastructure operators and project managers planning local generation and storage integration.
• Standards committees and technical developers referencing it for harmonized energy-efficiency criteria in the IEC 60364 series.

Practical uses:

• Creating an energy efficiency action plan for a commercial building or industrial plant.
• Defining metering, sensor and forecast inputs for load management systems.
• Selecting transformer locations and optimizing cable routes to reduce losses.
• Assessing and classifying electrical installation efficiency for retrofit prioritization.

Related standards

• IEC 60364 series (general rules for low-voltage installations)
• Relevant product standards for equipment energy efficiency (product operational efficiency is covered by product-specific standards)
• IEC Guide 119 and IEC Guide 118 (guidance for preparing energy-efficiency publications)

Keywords: IEC 60364-8-1:2019, energy efficiency, low-voltage electrical installations, electrical installation efficiency, load management, transformer efficiency, demand response, local energy production, EEMS.