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IEC 60974-13-2021 Arc welding equipment – Part 13: Welding current return clamp. 5 Tests 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. 6 Designation 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.

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