BS EN IEC 60974-2-2019 pdf download.Arc welding equipment Part 2: Liquid cooling systems (IEC 60974-2:2019).
This part of IEC 60974 specifies safety and construction requirements for industrial and professional LIQUID COOLING SYSTEMS used in arc welding and allied processes to cool torches.
This document is applicable to LIQUID COOLING SYSTEMS which are stand-alone (separate from the welding equipment) or built-in (housed in a single enclosure with other welding equipment).
This document is not applicable to refrigerated cooling systems.
NOTE 1 Typical allied processes are electric arc cutting and arc spraying.
NOTE 2 This part of IEC 60974 does not include electromagnetic compatibility (EMC) requirements that are given in IEC 60974-1 0.
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 60974-1 :201 7, Arc welding equipment – Part 1: Welding power sources
IEC 60974-7:201 3, Arc welding equipment – Part 7: Torches
IEC 60974-1 0:201 4, Arc welding equipment – Part 10: Electromagnetic compatibility (EMC) requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60974-1 and
IEC 60974-7 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 cooling power
P power related to the coolant flow rate and temperature rise
3.2 liquid cooling system
system that circulates and cools liquid used for decreasing the temperature of torches
3.3 cooling power at 1 l/min
P 1 l/min COOLING POWER at 1 l/min flow rate defined for comparison
4 Environmental conditions
As specified in Clause 4 of IEC 60974-1 :201 7.
5 Tests
5.1 Test conditions
As specified in 5.1 of IEC 60974-1 :201 7.
Stand-alone cooling systems may be tested without a welding power source.
Built-in cooling systems shall be tested with the welding power source.
5.2 Measuring instruments
The accuracy of measuring instruments shall be:
a) electrical measuring instruments: class 1 (± 1 % of full-scale reading), except for the measurement of insulation resistance and dielectric strength where the accuracy of the instruments is not specified, but shall be taken into account for the measurement;
b) thermometer: ± 2 K;
c) pressure measuring instruments: class 2,5 (± 2,5 % of full-scale reading);
d) flow-rate measuring instruments: class 2,5 (± 2,5 % of full-scale reading).
5.3 Conformity of components
As specified in 5.3 of IEC 60974-1 :201 7.
5.4 Type tests
All type tests shall be carried out on the same cooling system unless specified otherwise.
As a condition of conformity the type tests given below shall be carried out in the following sequence:
a) general visual inspection (as defined in 3.1 .7 of IEC 60974-1 :201 7);
b) mechanical provisions (as specified in Clause 7);
c) protection provided by the enclosure (as specified in 6.2.1 of IEC 60974-1 :201 7);
d) insulation resistance (as specified in 6.1 .4);
e) dielectric strength (as specified in 6.1 .5).BS EN IEC 60974-2 pdf download.