The outdoor light will definitely require a ground (or earth) connection. If the wiring coming from the fuse box doesn't have an earth wire, you will need to replace it with one that does.
Where Do I Attach The Ground Wire When Hooking Up An Outdoor Light?
Ground is connected to your switch box.
My washing machine has a ground wire attached to it but it's not connected to anything should it be?? And if so what?
