May 25, 2017· What is the load? What voltage are you using? If your washing machine is say 2,000W and you are using 230V, then the current (Amps) is 8.6. If, however, you are using 110v, then the current is 18A. More importantly, what is the rating pin the fuse for that circuit? If you have a fuse in the plug (13A), 2.5 mm is absolutely fine.