Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, and definitions

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