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Hi i have just installed a new fan off the lighting circuit in a bathroom but upon testing i realised that there was no earth in the distribution board. I know you can't fail lights with no earth aslong as they are class 2 plastic fittings. So is this ok or will i have to run a seperate aerth to my new works as its in a special location altough everything is pastic and the fan doesn't have an erath terminal in anyways. Many Thanks in advance for advice