Hi all, hoping for help sizing a new electric cable. The cable will run for 25m internally (direct from the CU), then 75m underground to the top of the garden to a new shed/cart lodge structure. Usual power tools in there, including a welder, nothing out of the ordinary. The current shed cable runs 25m internally, but then around 30m underground externally, is 2.5mm T&E then SWA (unsure on size, but think it's 2.5mm 2 core) - the lights tend to flicker if I'm running the welder or chop saw - possible a voltage drop given the length? Currently thinking I need to upgrade to 6mm or 10mm? Is 10mm enough/too much?