MT 1 - TC 64/MT 1

IEC 60364-1:2025 defines the scope and objective of the IEC 60364 series and specifies the fundamental safety requirements for an electrical installation.
This document addresses the fundamental principles, assessment of general characteristics and definitions of low-voltage electrical installations.
This sixth edition cancels and replaces the fifth edition published in 2005. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the entire document has been restructured and renumbered, maintaining the numbering of the (sub)clauses which are preceded with the part number, i.e. 1.1, 1.2, etc.;
b) the scope has been expanded to include new areas of application and has been restructured;
c) in 1.5.2.2.2, the topic of safety services and standby electric supply systems has been added;
d) in 1.5.2.14, the topic of energy efficiency has been included;
e) in 1.5.2.15, the topic of prosumer electrical installations has been included;
f) in 1.5.3.5, the requirement for an equivalent safety level for the use of new materials and innovations for which no product standards exist yet has been added;
g) in 1.5.4.3, the recommendation to assess the effectiveness of protective measures for the safety of human beings and livestock to be maintained by periodic verification during the entire lifetime of the installation has been added;
h) Table 3 shows the symbol for the newly introduced "system-referencing-conductor (SRC)";
i) the number of figures showing the type of electric system in AC and DC systems is limited to illustrate requirements.

IEC 60050-826:2022 gives the general terminology used for electrical installations such as those of residential, industrial or commercial premises. It does not cover systems for distribution of energy to the public or power generation and transmission for such systems. This new edition reviews and complements the previous one. An important aim of the revision is to achieve compliance with IEC 61140:2016. In addition, some new terms have been added from IEC 60364-8-1:2014 and IEC 60364-8-2:2018. It has the status of a horizontal publication in accordance with IEC Guide 108.
This terminology is consistent with the terminology developed in the other specialized parts of the IEV.
This horizontal publication is primarily intended for use by technical committees in the preparation of IEC publications in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of horizontal publications in the preparation of its publications.