IEC 60974-6-2015 pdf free download.Arc welding equipment – Part 6: Limited duty equipment.
6.1.4 Insulation resistance See 6.1.4 of IEC 60974-1:2012.
6.1.5 Dielectric strength
See 6.1.5 of IEC 60974-1:2012.
6.2 Protection against electric shock in normal service (direct contact)
6.2.1 Protection provided by the enclosure
6.2.1.1 General
Welding power sources shall have a minimum degree of protection of IP21S using IEC 60529 test procedures and conditions.
Remote controls for welding power sources shall have a minimum degree of protection of IP2X using IEC 60529 test procedures and conditions.
6.2.1.2 Protection against ingress of water
Adequate drainage shall be provided by the enclosure. Retained water shall not interfere with the correct operation of the equipment or impair safety.
Conformity shall be checked as follows:
A welding power source shall be subjected to the appropriate water test without being energized. Immediately after the test, the welding power source shall be moved to a safe environment and subjected to the insulation resistance and dielectric strength tests.
Adequate drainage of the enclosure shall be checked by visual inspection.
6.2.1.3 Side and top enclosure openings
The enclosure shall be such that a 50 mm long test pin cannot be inserted from all sides except the underside to touch:
a) live parts of the input circuit or
b) in the case of Class II welding power sources, any metal part which is separated from live parts of the input circuit by basic insulation.
Conformity shall be checked with test probe 12 of IEC 61032:1997 (see Figure A. 1).
6.2.1.4 Bottom enclosure openings
The enclosure shall be such that a 15 mm long test pin cannot be inserted from the underside to touch:
a) live parts of the input circuit and
b) in the case of Class II welding power sources, any metal part which is separated from live parts of the input circuit by basic insulation.
Conformity shall be checked with test probe 13 of IEC 61032:1997 (see Figure A.2).
6.2.2 Capacitors
See 6.2.2 of IEC 60974-1:2012.IEC 60974-6 pdf download.