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Answers to common questions about the lead that carries welding current from the machine to the electrode holder.
Look over the whole lead each day before you start. The HSE says the insulation on the cables, plugs, clamps and electrode holder should be undamaged, and that connectors should be clean, undamaged and correctly rated for the current.Check the full length of the cable for cuts, crushed sections, bare copper or bulges. Check that the holder handle and jaw insulation is intact and that the plug fits snugly and is not discoloured by heat. Report any defect straight away rather than carrying on.
Some warmth in use is normal, but a lead that becomes too hot to hold points to a problem. The usual causes are a loose or dirty connection, a cable or connector that is too small for the current, or damaged cable with broken strands. Each of these adds electrical resistance, and resistance produces heat.The HSE says connectors should be clean, undamaged and correctly rated for the current. Switch off, let everything cool, then check the plug, the holder end and the cable. If heating continues, replace the damaged part or move up to a larger lead, and check the rating in the holder and welder manuals.
The rating is the current the holder is designed to carry, and it is normally tied to a duty cycle, which is the share of a ten minute period the holder can be in use at that current. Holders for manual metal arc welding are made to a recognised standard that covers safety and performance, including insulation and heating.Choose a holder rated at or above the maximum output you will use, with a suitable range of electrode diameters and cable size. A higher-rated holder is usually larger and heavier, so pick the rating that matches your work. The holder's markings and manual give the exact figures.
Cable size is given as the conductor cross-section in mm2. It depends on the welding current you will use, how much of each ten minutes you are actually welding, and the total length of the circuit, which means the electrode lead plus the work lead.The higher the current or duty cycle, or the longer the leads, the larger the cable usually needs to be. If you are in doubt, going one size larger is generally the safer choice. The welder's manual normally gives recommended sizes for its maximum output, so check there first.