Hello all, not your usual tripping post here. so yesterday doing some welding with my trusty cheap and basic Clarke 90en on some van sills - nothing major. overnight welder was stored in shed out the weather. Today get it out setup and it instantly trips the 20amp rcbo breaker its on, but only when connected to the van. I believe it’s not the breaker because it will weld fine if I just weld two bolts together. here is a video https://sitecore.box.com/s/dr3hf1pk3la9lcf4qkn84d3kvx2ajgfl Obviously it somehow finds ground and trips out... any tips or tests I can try to work out what’s going on welcomed, racking my brains now!