IEC 60974-13-2021 Arc welding equipment – Part 13: Welding current return clamp.
5.1 Test conditions
All type tests shall be carried out on the same new and completely assembled WELDING CURRENT RETURN CLAMP .
All type tests shall be carried out at an ambient air temperature between 1 0 °C and 40 °C.
5.2 Measuring instruments
As specified in 5.2 of IEC 60974-1 :201 7.
5.3 Test sequence
The type tests given below shall be carried out in the following sequence:
a) general visual inspection;
b) temperature rise, see 8.1 ;
c) RETAINING MEANS , see 9.1 ;
d) drop withstand, see 9.4;
e) voltage drop, see Clause 7;
f) general visual inspection.
The other type tests in this document not mentioned above may be carried out in any convenient sequence.
The WELDING CURRENT RETURN CLAMP shall be designated by the range of cross-section area of the welding cable intended to be connected. The test current is given in Table 1 based on maximum cross-section area. The WELDING CURRENT RETURN CLAMP shall accept the minimum cross-sectional area as given in Table 1 . Minimum cross-sectional area may be reduced to extend the WELDING CURRENT RETURN CLAMP fitting range.
Conformity shall be checked by measurement.
7 Protection against electric shock – Voltage drop
The WELDING CURRENT RETURN CLAMPS in the new condition shall be capable of satisfactorily
passing the voltage test.
Conformity shall be checked by the following test:
Two WELDING CURRENT RETURN CLAMPS are required for this test. Connect each clamp to a cable of maximum cross-sectional area as indicated in Table 1 , by using the method of attachment for which the clamps are designed. Attach one clamp to each end of a clean mild steel plate 300 mm × 75 mm × 1 2 mm. The two clamps shall be positioned so that the centers of the contact points are 260 mm ±20 mm apart. Connect the other end of the cables to a power source to form a circuit. Pass the test current through both clamps and the plate. The voltage is measured on the two cables, at a distance of 1 0 mm from the cable connections. The voltage drop shall not exceed 0,08 V per 1 00 A of the test current.IEC 60974-13 pdf download.