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Message: <blockquote data-quote="Phoenix" data-source="post: 558278" data-attributes="member: 8133">And if it goes instantly with a loud bang, rather than after a number of seconds, you can assume its kicking out on the mag, for a B32 thats going to be at least 3x32A = 96A. So say 100A and do a quick *** packet caluclation, You've got a resistance thats 2.3ohms or below, which is a lot lower than most loads will have (Watch out for things like transformers though, that can have quite a low resistance, because most of their impedance is reactive), but if its as low as 2.3ohms then you'd expect it to sometimes take the B32 MCB out through inrush. So maybe you might see a resistance that low if someone has left a 5ka site transformer or old skool stick welder plugged in, but unlikely in a domestic. So just go round and disconnect the appliances you can see, afterall the issue might be with an appliance. then start trying to work out where on the circuit fault is, if its still thereWhen you are talking of low resistances like that, the cable resistance is going to be significnant to your readings, so you can use your plug top lead and go round the circuit and find which sockets have the lowest reading and therefore are closest to the fault.</blockquote>