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Do the fluorescent lamps require earthing? The problem is that the lighting circuit ( only two fluorescent lamps) trips the RCD when the lamps are earthed. When the earth leads are removed the RCD does not trip.

Is there any guide for fixing DG units into a wooden (oak) casement window. I need information on use of butyl, of blocks to separate the DG from the frame and some method of retaining the DG unit. Very grateful