MT 41 - TC 64/MT 41

IEC 60364-8-81:2026 provides additional requirements, measures and recommendations for the design, erection, operation and verification of all types of low-voltage electrical installation including local production and storage of energy for optimizing the overall efficient use of electricity.
It introduces requirements, recommendations and methods for the design and the energy efficiency (EE) assessment of an electrical installation within the framework of an energy efficiency management approach in order to get the best permanent functionally equivalent service for the lowest electrical energy consumption and the optimal availability and acceptable cost-effectiveness.
These requirements, recommendations and methods apply, within the scope of the IEC 60364 series, for new installations and modification of existing installations.
This document is applicable to the electrical installation of a building or system and does not apply to products. The energy efficiency of products and their operational requirements are covered by the relevant product standards.
It is possible that another standard provides specific requirements for a particular system or installation application (e.g. manufacturing system covered by ISO 20140 series).
This document does not specifically provide requirements for building automation systems. The contribution of building automation systems to improve energy efficiency of the installation is considered.
This group energy efficiency publication is primarily intended to be used as an energy efficiency standard for the low-voltage electrical installations mentioned in the scope, but is also intended to be used by technical committees in the preparation of publications, in accordance with the principles laid down in IEC Guide 118
This first edition cancels and replaces the second edition of IEC 60364-8-1 published in 2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) modified numbering that allows IEC 60364-7 subparts to amend this document;
b) alignment of the definitions with IEC 60050-826;
c) introduction of minimum energy moment method in Annex A;
d) improvements in Annex B

IEC 60364-8-1:2019 provides additional requirements, measures and recommendations for the design, erection and verification of all types of low-voltage electrical installation including local production and storage of energy for optimizing the overall efficient use of electricity. It introduces requirements and recommendations for the design of an electrical installation within the framework of an energy efficiency management approach in order to get the best permanent functionally equivalent service for the lowest electrical energy consumption and the most acceptable energy availability and economic balance. These requirements and recommendations apply, within the scope of the IEC 60364 series, for new installations and modification of existing installations. This standard is applicable to the electrical installation of a building or system and does not apply to products. The energy efficiency of these products and their operational requirements are covered by the relevant product standards. This standard does not specifically address building automation systems.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision of Annex B;
b) revision of 4.2: Energy efficiency assessment for electrical installations;
c) update of 8.3: Input from loads, sensors and forecasts;
d) introduction of new definitions.
This group energy efficiency publication is primarily intended to be used as an energy efficiency standard for the low voltage electrical installations mentioned in Clause 1, but is also intended to be used by technical committees in the preparation of standards, in accordance with the principles laid down in IEC Guide 119 and IEC Guide 118.
The contents of the corrigendum of May 2019 have been included in this copy.