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IEC 60364-8-81:2026: Energy Efficiency and Efficiency Classes in Electrical Installations

Energy efficiency in electrical installations directly affects both operating costs and carbon footprint. A new standard addresses this issue at the installation level. IEC 60364-8-81:2026’(Ed. 1.0, February 2026). This “horizontal” standard provides a framework for evaluating and improving the energy efficiency of low-voltage electrical installations.

What is IEC 60364-8-81?

The full title is "“Low-voltage electrical installations — Chapters 8-81: Functional considerations — Energy efficiency”"is. The standard, the previous one." IEC 60364-8-1:2019 It replaces the previous edition and includes a technical revision (IEC 60364 series, new numbering 8-1 → 8-81). It systematically addresses energy efficiency from the design of the installation to its operation and maintenance.

Electrical installation efficiency classes

The most notable aspect of the standard is its focus on the energy efficiency of an electrical installation. evaluation method and accordingly efficiency classes This is a definition (normative Annex B). An efficiency class can be determined for industrial, commercial, and residential installations, clarifying improvement priorities.

Key topics covered by the standard

  • Determining the load energy profile.
  • Optimization of transformer and distribution panel layout. (energy moment / barycentre methods)
  • Reducing losses and voltage drop in cabling.
  • Efficiency of local production and storage (solar power, battery)
  • Measurement, monitoring and energy management system (EEMS); demand response
  • Multi-resource management: grid, local production and storage.
  • Maintaining and sustaining the performance of the system.

AES Innovation approach

AES Innovation provides energy efficiency assessment and consulting services for electrical installations through its engineering team. Our related services and content include:

Frequently Asked Questions

What is IEC 60364-8-81?

This is a horizontal IEC standard that defines the framework for evaluating and improving the energy efficiency of low-voltage electrical installations. The current edition is IEC 60364-8-81:2026 (Ed. 1.0, February 2026).

Are IEC 60364-8-81 and IEC 60364-8-1 the same?

This is the current version of the same document. IEC 60364-8-1:2019 has been renumbered and technically revised to IEC 60364-8-81 with the new series numbering (Ed. 1.0, 2026).

What is the electrical efficiency class?

This is a classification, defined in normative Annex B of the standard, that indicates the energy efficiency level of an electrical installation. Efficiency classes can be determined for industrial, commercial, and residential installations.

Who conducts energy efficiency assessments?

At AES Innovation, energy efficiency assessment and consulting for electrical installations are carried out by our engineering team in accordance with relevant standards and methods.

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