WG 3 - PC 127/WG 3
PC 127/WG 3
General Information
Frequently Asked Questions
WG 3 is a Technical Committee within the International Electrotechnical Commission (IEC). It is named "PC 127/WG 3". This committee has published 696 standards.
WG 3 develops IEC standards in the area of Information technology. Currently, there are 696 published standards from this technical committee.
The International Electrotechnical Commission (IEC) is the world's leading organization for the preparation and publication of international standards for electrical, electronic, and related technologies. Founded in 1906, the IEC provides a global platform for companies, industries, and governments to meet, discuss, and develop the international standards they require.
A Technical Committee (TC) in IEC is a group of experts responsible for developing international standards in a specific technical area. TCs are composed of national member body delegates and work through consensus to create standards that meet global industry needs. Each TC may have subcommittees (SCs) and working groups (WGs) for specialized topics.
IEC TS 63346-2-3:2025 specifies common rules and requirements for the design of low voltage (LV) AC auxiliary power systems (APSs) intended to be installed in substations, mainly covering the configuration of AC power sources, system wiring, protection, electric equipment selection and physical layout.
For the purpose of interpreting this document, an AC APS in this document is considered as follows:
- with a nominal voltage up to and including 1 kV AC;
- providing LV AC power to substation AC loads.
Though it is discussed where necessary, AC loads as well as high voltage (HV) part is beyond the scope of this document.
Substations in this document refer to those which are part of an electrical system and contain equipment that either receives and distributes electrical energy or transforms voltages to the levels required by the loads they supply, or both.
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