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Exactly why I only mentioned the alternatives, but it is probably a good idea to state they are a bad idea. I don't believe that there is a risk of the wiring catching fire: the socket will be fed by 2.5mm, and the lead is 4mm, so a 13A fuse will blow well before either of these melts. The precautions against fire were for the benefit of a first-time welder, who may be so concerned about the fuse blowing that they forget the second main danger is from sparks setting fire to the place. (The main danger being electrocution by simultaneous contact with work-piece and feed).Powder extinguishers make a right mess.