IEC 62477-1:2022 

Safety requirements for power electronic converter systems and equipment - Part 1: General


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IEC 62477-1:2022 applies to power electronic converter systems (PECS), any specified accessories, and their components for electronic power conversion and electronic power switching, including the means for their control, protection, monitoring and measurement, such as with the main purpose of converting electric power, with rated system voltages not exceeding 1 000 V AC or 1 500 V DC.
This document also applies to PECS which intentionally emit or receive radio waves for the purpose of radio communication.
This document can also be used as a reference standard for product committees producing product standards for:
  • adjustable speed electric power drive systems (PDS);
  • standalone uninterruptible power systems (UPS);
  • low voltage stabilized DC power supplies;
  • bidirectional power converters.
For PECS and their specified accessories for which no product standard exists, this document provides minimum requirements for safety aspects.
This document has the status of a group safety publication in accordance with IEC Guide 104 for power electronic converter systems for solar, wind, tidal, wave, fuel cell or similar energy sources.
According to IEC Guide 104, one of the responsibilities of technical committees is, wherever applicable, to make use of basic safety publications and/or group safety publications in the preparation of their product standards.
Guidance for use of this group safety publication for product committees is given in Annex S.
This document
  • establishes a common terminology for safety aspects relating to PECS,
  • establishes minimum requirements for the coordination of safety aspects of interrelated parts within a PECS,
  • establishes a common basis for minimum safety requirements for the PECS portion of products that contain PECS,
  • specifies requirements to reduce risks of fire, electric shock, thermal, energy and mechanical hazards, during use and operation and, where specifically stated, during service and maintenance, and
  • specifies minimum requirements to reduce risks with respect to PECS designed as pluggable and permanently connected equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the PECS in the manner prescribed by the manufacturer.
This document does not cover
  • telecommunications apparatus other than power supplies to such apparatus,
  • functional safety aspects as covered by, for example, IEC 61508 (all parts), and
  • electrical equipment and systems for railways applications and electric vehicles.
This edition includes the following significant technical changes with respect to the previous edition:
a) PECS emitting or receiving radio waves added in the Scope;
b) simplification of the concept of DVC As including the voltage-time-zones;
c) improved consistency of the concept "protection" versus "insulation" according to IEC 61140;
d) limits for touch current updated and limits for PE conductor currents added;
e) thin sheet of tape materials reworked and tests added;
f) inner layers of multi-layer printed wiring boards added;
g) mechanical hazards updated;
h) requirements for enclosures updated;
i) requirements for wiring and connections updated;
j) polymeric enclosure requirements updated;
k) requirements for components added;
l) several test added (e.g. UV, working voltage, SPD, preconditioning);
m) information and marking requirements updated;
n) requirements for the contrast of symbols added;
o) several annexes updated.

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Additional information

Publication typeInternational Standard
Publication date2022-05-20
Available language(s)English/French
TC/SCTC 22 - Power electronic systems and equipmentrss
ICS29.200 - Rectifiers. Converters. Stabilized power supply
Stability date  2024
File size13983 KB

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