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While you're looking at the power supply situation, take a minute to check that the mains plug does not have any loose connections.
Once this has been achieved, the mains plug should be removed again before proceeding with the lighting.
The fuse in the mains plug (which should be a 2 or 3 amp type for most projects) should 'blow' and prevent any serious problems.
Y-shaped mains leads are also becoming popular in some countries, enabling 2 appliances to run from one mains plug.
It was intended to become the common mains plug and socket standard, to be used one day everywhere in Europe and other regions with 230 V mains.