IEC 60974-8:2021 pdf download

IEC 60974-8:2021 pdf download.Arc welding equipment – Part 8: Gas consoles for welding and plasma cutting systems
1 Scope
This part of IEC 60974 specifies safety and performance requirements for GAS CONSOLES intended to be used with combustible gases or oxygen. These GAS CONSOLES are designed to supply gases for use in arc welding, plasma cutting, gouging and allied processes in non- explosive atmospheres. The GAS CONSOLE can be external or internal to the power source enclosure. In the latter case, the power source shall meet the requirements of both IEC 60974-1 and this document. NOTE See Annex A for mechanised plasma system diagram.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-151:2001, International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and magnetic devices IEC 60050-151:2001/AMD1:2013 IEC 60050-151:2001/AMD2:2014 IEC 60050-151:2001/AMD3:2019 IEC 60050-151:2001/AMD4:2020 IEC 60529:1989, Degrees of protection provided by enclosures (IP Code) IEC 60529:1989/AMD1:1999 IEC 60529:1989/AMD2:2013 IEC 60664-1, Insulation coordination for equipment within low-voltage supply systems – Part 1: Principles, requirements and tests IEC 60974-1:2017, Arc welding equipment – Part 1: Welding power sources IEC 60974-1:2017/AMD1:2019 IEC 60974-10, Arc welding equipment – Part 10: Electromagnetic compatibility (EMC) requirements ISO 10225, Gas welding equipment — Marking for equipment used for gas welding, cutting and allied processes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-151 and IEC 60974-1, as well as the following, apply.3.1 gas console device for gas-flow routing, mixing or both that contains electrical apparatus in a single or multiple enclosure, or open structure 3.2 lower explosion limit LEL concentration of flammable gas or vapour in air, below which the gas atmosphere is not explosive 3.3 lower flammability limit LFL minimum concentration of combustible gas in a mixture where a combustion can be ignited by an ignition source 3.4 upper explosion limit UEL concentration of flammable gas or vapour in air, above which the gas atmosphere is not explosive 3.5 upper flammability limit UFL maximum concentration of combustible gas in a mixture where a combustion can be ignited by an ignition source 3.6 external gas console GAS CONSOLE not incorporated in a power source 3.7 internal gas console GAS CONSOLE incorporated in a power source 3.8 single-fault condition condition in which one means for protection against hazard is defective Note 1 to entry: If a SINGLE – FAULT CONDITION results unavoidably in another SINGLE – FAULT CONDITION , the two failures are considered as one SINGLE – FAULT CONDITION . 3.9 hazardous-live-part live part which, under certain conditions, can give a harmful electric shock [SOURCE: IEC 60050-195:1998, 195-06-05] 3.10 hazardous part part that is hazardous to approach or touch
5 Tests
5.1 Test conditions As specified in 5.1 of IEC 60974-1:2017. 5.2 Measuring instruments As specified in 5.2 of IEC 60974-1:2017. 5.3 Conformity of components As specified in 5.3 of IEC 60974-1:2017. 5.4 Type tests As specified in 5.4 of IEC 60974-1:2017. The other tests included in this document may be carried out in any convenient sequence. 5.5 Routine tests 5.5.1 E XTERNAL GAS CONSOLE All routine tests shall be carried out on each EXTERNAL GAS CONSOLE in the following sequence: a) general visual inspection, see 3.1.7 of IEC 60974-1:2017; b) continuity of protective circuit, see 10.5.3 of IEC 60974-1:2017; c) dielectric strength, see 6.1.5 of IEC 60974-1:2017; d) leak test, see 10.3; e) general visual inspection, see 3.1.7 of IEC 60974-1:2017. 5.5.2 I NTERNAL GAS CONSOLE All routine tests, as specified in 5.5 of IEC 60974-1:2017, shall be carried out on each INTERNAL GAS CONSOLE , with the following addition: a) leak test, see 10.3.