BS EN IEC 60974-2:2019 pdf free.Arc welding equipment.
As specified in 5.1 of IEC 60974-1:2017. Stand-alone cooling systems may be tested without a welding power source. Built-in cooling systems shall be tested with the welding power source. Measuring instruments. The accuracy of measuring instruments shall be:  a) electrical measuring instruments: class 1 (土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: 士2 K; c) pressure measuring instruments: class 2,5 (土2,5 % of full-scale reading); d) flow-rate measuring instruments: class 2,5 (士2,5 % of full-scale reading).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 60974-1:2017); b) mechanical provisions (as specified in Clause 7); c) protection provided by the enclosure (as specified in 6.2.1 of IEC 60974-1:2017); . d) insulation resistance (as specified in 6.1 .4); e) dielectric strength (as specified in 6.1.5). . The other tests included in this document and not listed here may be carried out in any convenient sequence.With the cooling system filled with the cooling liquid specified by the manufacturer (see 12.1 e)), the leakage current from the torch to the protective earth connection of the cooling system shall not exceed 10 mA DC. Conformity shall be checked by applying a DC voltage of 500 V at room temperature between the protective earth connection and a copper pipe to simulate the torch connected to the outlet of the cooling system by a hose with a maximum length of 0,5 m as shown in Figure 1. The minimum inner diameter of the hose shall be 5 mm. The minimum length of the copper pipe shall be 10 cm with a minimum internal diameter of 5 mm. The cooling system and the  simulated torch are filled with liquid for the test. The pump is operating.BS EN IEC 60974-2 pdf download.