Hi im a bit of a DIY er and do some welding in my shed have done for years but few months ago had the fuse box in my hoouse replaced with these new MCB breakers up untill then had no probs with the fuses blowing when useing welder but now every time i try weld the breaker trips.My shed is wired from standard 13amp plug socket the cable to the shed is the old 210 and runs into into a fuse box n the shed i only ever run onething at a time in the shed as not to overload. my question is in the main box the MCB switch on the down ring which the shed is pluged into is a b20 nhxb20 MCB would it be ok to replace that breaker with a b40 nhxB40 MCD to deal with the inital surge the welder requires to start up thank you in advance for Any help