BS EN IEC 60974-2:2019 pdf download

BS EN IEC 60974-2:2019 pdf download.Arc welding equipment Part 2: Liquid cooling systems (IEC 60974-2:2019).
3.3
COOLING POWER at 1 11 mm flow rate defined for comparison
4 Environmental conditions
As specified in Clause 4 of IEC 60974-1:2017.
5 Tests
5.1 Test conditions
As specified in 51 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
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 (i 2.5 % of full-scale reading).
5.3 ConformIty of components
As specified in 5.3 of IEC 60974-1:2017.
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 60974.1:2017);
b) mechanical provisions (as specified In Clause 7);
c) protection provided by the enclosure (as specified in 6.2.1 of IEC 80974-1:2017):
d) insulation resistance (as specified in 6.14);
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
5.5 Routine tests
All routine tests given below shall be carried out on each cooling system in the following sequence:
a) visual inspection in accordance with manufacturer’s specification;
6.4.2 Multi-supply voltage
As specified in 10.2 of IEC 80974-1:2017.
6.4.3 Means of connection to the supply circuit As specified in 10.3 of IEC 60974-1:2017.
6.4.4 Marking of terminals
As specified in 10.4 of IEC 60974-1 :2017.
6.4.5 Protective circuit
As specified In 10.5 of EC 60974-1:2017.
6.4.6 Cable anchorage
As specified in 10.6 of PEC 80974-1:2017.
6.4.7 Inlet openings
As specified in 10.7 of IEC 60974-1:2017.
6.4,8 Supply circuit onioff switching device As specified in 10,8 of IEC 60974-1:2017,
6.4.9 Supply cables
As specified In 10.9 of 1EC 60974-1:2017.
6.4.10 Supply coupling device (attachment plug)
If a supply coupling device Is provided as a part of the LIQUID COOUNG SYSTEM. its rated values shall be not less than the maximum effective supply current
For supply networks up to 125 V. the rated current shall, additionally, not be less than either a) or b):
a) 70 % of the rated maximum supply current:
b) 70 % of the supply current, as measured with the fan motor or pump stalled, whichever Is greater.
Conformity shall be checked by visual inspection, measurement and calculation.
6.5 Leakage current between welding circuit and protectiv, earth
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 eadh 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.
7 Mechanical provisions7.1General
As specified in Clause 14 of lEC 60974-1:2017.The test shall be carried out with cooling liquid.7.2 Cooling liquid overflow
When filling the cooling system in accordance with the manufacturer’s instructions, overflowor spillage shall not result in electric shock.
Conformity shall be checked by the following treatment and test. The liquid container iscompletely filled.A further quantity of liquid equal to 15 % of the capacity of the container or 0,25 l, whichever is the greater, is then poured in steadily over a period not to exceed 60 s.lmmediately after this treatment, the equipment shall pass the dielectric strength test of 6.1.5between input circuits and exposed conductive parts.
7.3 Hose coupling devices and hose connections
lf hose coupling devices or hose connections，which often have to be undone，are placedabove or near to live parts，these live parts shall be protected from cooling liquid by splashproof enclosures，with drains or other appropriate measures.An exception is made for liveparts of the welding circuit.