Generally, a 3-amp fuse is used for appliances up to 720 watts and a 13-amp fuse for appliances between 720-3000 watts.
Fel arfer, defnyddir ffiws 3 amp ar gyfer cyfarpar hyd at 720 watt a ffiws 13 amp ar gyfer cyfarpar rhwng 720 a 3000 watt.