UNE-EN IEC 62271-4:2023

This part of IEC 62271 applies to the procedures for handling of gases and gas mixtures for

insulation and/or switching during installation, commissioning, repair, overhaul, normal and

abnormal operations and disposal at the end-of-life of high-voltage switchgear and controlgear.

These procedures are regarded as minimum requirements to ensure the reliability of electric

power equipment, the safety of personal working with these gases and gas mixtures and to

minimize the impact on the environment. Additional requirements could be given or specified in

the operating instruction manual of the manufacturer.

For each gas or gas mixture, which is known to be used in electric power equipment at the date

of the publication of this document, a separate annex describes specifications, handling

procedures, safety measures, etc. For gases or gas mixtures not covered by these annexes the

electric power equipment manufacturer should provide the information needed, following the

structure of these annexes. Such gases or gas mixtures should also be described in a next

edition or in amendments to this edition.

NOTE 1 For the use of this document, high-voltage (HV) is defined as the rated voltage above 1 000 V. However,

the term medium-voltage (MV) is commonly used for distribution systems with voltages above 1 kV and generally

applied up to and including 52 kV.

NOTE 2 Throughout this standard, the term pressure stands for absolute pressure .

NOTE 3 Reference is also made to (Cigré Brochure 802, 2020).

NOTE 4 For further details on gases, e.g. ecotoxicology, also refer to the chemical database ECHA

(www.echa.europa.eu), which takes the actual volume band into consideration.

NOTE 5 When reference to circuit-breakers is made, only gas circuit-breakers are of interest. When vacuum circuit-

breakers are of interest, they are explicitly mentioned.