CE marking!!! don't make me laugh, ever since the Chinese announced that NOTHING that they mark "CE" is actually tested as such for sale in the EEC, and that the letters "CE" stamped on all their products stands for "China Export" the CE mark has been absolutely worthless. I am an electrical engineer who regularly fits lights in Bathrooms, which are Stamped CE and marked "suitable for use in bathrooms" They are made in China, marked CE, approved by the local authority inspector, and the quality is absolute rubbish. Your first reply was absolutely correct, the power supply is a sealed and earthed unit, and the power beyond that box is low voltage, you need have no worries,. If you are going to do a lot of these, and make a lot of money, and want peace of mind, get third party liability insurance, it is a lot cheaper than most people think.