IEC 60974-8-2021 pdf free download – Arc welding equipment – Part 8: Gas consoles for welding and plasma cutting systems
This part of lEC 60974 specifies safety and performance requirements for GAs cONSOLESintended to be used with combustible gases or oxygen.TheseGAs coNSoLEs are designed tosupply 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.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.
For undated references,the latest edition of the referenced document(including anyamendments) applies.
IEC 60050-151:2001,International Electrotechnical Vocabulary (IEV)- Part 151:Electrical andmagnetic devices
lEC 60050-151:2001/AMD1:2013IEC 60050-151:2001/AMD2:2014IEC 60050-151:2001/AMD3:2019IEC 60050-151:2001/AMD4:2020
IEC 60529:1989,Degrees of protection provided by enclosures (IP Code)IEC 60529:1989IAMD1:1999
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 sourcesIEC 60974-1:2017iAMD1:2019
IEC 60974-10,Arc weldingequipment – Part 10: Electromagnetic compatibilty(EMC)requirements
ISO 10225,Gas welding equipment —Marking for equipment used for gas welding, cutting andallied processes
3Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-151 andIEC 6o97i4-1,as well as the following, apply.- IEC Electropedia: available at http://www.electropedia.orgl
. Iso Online browsing platform: available at http://www.iso.orglobp
3.1
gas console
device for gas-flow routing，mixing or both that contains electrical apparatus in a single ormultiple enclosure, or open structure
3.2
lower explosion limitLEL
concentration of flammable gas or vapour in air，below which the gas atmosphere is notexplosive
3.3
lower flammability limitLFL
minimum concentration of combustible gas in a mixture where a combustion can be ignited byan ignition source
3.4
upper explosion limituEL
concentration of flammable gas or vapour in air,above which the gas atmosphere is notexplosive
3.5
upper flammability limitUFL
maximum concentration of combustible gas in a mixture where a combustion can be ignited byan 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: lfa sINGLE -FAU儿TCONDITION results unavoidably in another sINGLE-FAULTCONDIToON , the two failuresare 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
4 Environmental conditions
As specified in Clause 4 of IEC 60974-1:2017.
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.IEC 60974-8 pdf download.