can any one help me im wiring up 2 down lights but not sure what to do with the earth wires it says in the instructons this unit is double insulated and must not be earthed if there are any incoming earth cables they must be joined together and well insulated with tape this is to ensure earth continuity throughout your property i have earth wires coming in but the lights are wired from each light into the main wires coming through roof what will i need to do