Hello
I've looked into how to rate the cable I need to supply my workshop and I will get someone in to help with working out the type of earthing that is best to use. The "run" will be about 50-75' (I'm measuring it later this week) and will be to supply power and lighting for single-phase duty (~ 3kW power plus a couple of strip lights). I'm happy to use online calculators to estimate correct sizing for permissible % drop under load. I think 4mm^2 will do it, from memory.
What I am unsure about is whether to use 2-core SWA and use the armouring as the earth, or go for three cores such that one of theose is the earth.
What's best practice?
Thanks
DDS