IEC 60974-11:2021 pdf download

IEC 60974-11:2021 pdf download.Arc welding equipment – Part 11: Electrode holders
1 Scope
This part of IEC 60974 is applicable to ELECTRODE HOLDERS for manual metal arc welding with electrodes up to 10 mm in diameter. It is not applicable to ELECTRODE HOLDERS for underwater welding. This document specifies safety and performance requirements of ELECTRODE HOLDERS .
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-151 and IEC 60974-1, as well as the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.1 electrode holder insulated tool for manual metal arc welding intended to clamp and guide the electrode and to ensure electrical connection to it [SOURCE: IEC 60050-851:2008, 851-14-04] 3.2 head part of the ELECTRODE HOLDER having cavities or jaws or equivalent for insertion, orientation, clamping and electrical connection of an electrode [SOURCE: IEC 60050-851:2008, 851-14-30] 3.3 handle part of the ELECTRODE HOLDER designed to be held in the operator’s hand [SOURCE: IEC 60050-851:2008, 851-14-28] 3.4 lever part which may be fitted to control the clamping device of an ELECTRODE HOLDER [SOURCE: IEC 60050-851:2008, 851-14-31] 3.5 rated current current assigned by the manufacturer that the ELECTRODE HOLDERS can accept at 60 % duty cycle without exceeding the permitted temperature rise 3.6 category A electrode holder ELECTRODE HOLDER in which no live part is accessible to the standard test finger as described in IEC 60529 [SOURCE: IEC 60050-851:2008, 851-14-05] 3.7 category B electrode holder ELECTRODE HOLDER in which, deviating from CATEGORY A , no live part is accessible at the HEAD to a sphere with a diameter related to the maximum diameter of the electrode (see 8.1b) [SOURCE: IEC 60050-851:2008, 851-14-06]
8 Protection against electric shock
Protection against direct contact 8.1 An ELECTRODE HOLDER without an electrode, fitted with a welding supply cable of minimum cross- sectional area as specified by the manufacturer, shall be protected against unintentional contact with live parts. In the case of CATEGORY A ELECTRODE HOLDERS , this requirement is also valid for the part of the electrode inserted into the ELECTRODE HOLDER . Electrodes having the minimum and maximum diameter as specified by the manufacturer shall be tested. Conformity shall be checked by: a) an access probe according to Table 6 of IEC 60529:1989 in the case of ELECTRODE HOLDERS of: 1) CATEGORY A , and 2) CATEGORY B with the exception of the HEAD ; b) a sphere in the case of the HEAD of CATEGORY B ELECTRODE HOLDERS with: 1) a metal sphere of 12,5 mm diameter according to IEC 60529 for electrodes up to 6,3 mm diameter, or 2) a metal sphere of d 0+0,05 mm diameter for electrodes thicker than 6,3 mm diameter where the value of d is twice the maximum diameter of the electrode as specified by the manufacturer. The sphere is to be applied to the opening with a force of 30 N ± 10 %. The springs not designed for carrying the welding current shall be insulated from other metal parts of the ELECTRODE HOLDER . Conformity shall be checked by visual inspection. 8.2 Insulation resistance The insulation resistance shall, after the humidity treatment, be not less than 1 M Ω. Conformity shall be checked by the following test : a) Humidity treatment A humidity cabinet is maintained at a temperature t between 20 °C and 30 °C to within ±1 K and a relative humidity between 91 % and 95 %.The ELECTRODE HOLDER without a cable fitted is brought to a temperature between t and (t + 4) °C and is then placed for 48 h in the humidity cabinet. b) Insulation resistance measurement Immediately after the humidity treatment, the ELECTRODE HOLDER is wiped clean and tightly wrapped in metal foil, covering the external surface of the insulation. The insulation resistance is measured by application of a DC voltage of 500 V between the live parts and the metal foil, the reading being made after stabilization of the measurement.