Hi,
Well I obviously don't know the exact details of the 3-way socket thing that you have. Like does it include a maximum current trip (or fuse) and/or a residual current device (RCD)?
But we regularly go camping and use an electric hook-up which consists of a reel of cable (25 metres which has almostly universally been plenty long enough) with a blue 3-pin IEC 60309 plug (see http://en.wikipedia.org/wiki/IEC_60309) on one end and various standard UK 230-volt mains connectiors on the other end.
We also have a residual-current-device RCD which we can insert in-line if the campsite's own mains hook-up point/socket doesn't include one.
In the UK we have never encountered anywhere that provides electric hook-ups that do *not* use this standard blue IEC 60309 3-pin connection.
When camping on the continent we have sometimes encountered sites what still use continental sockets and thus expect continental sockets. So we have a short lead with continental plug on one end and an IEC 60309 in-line *socket* on the other.
We run: A compact 12-volt fridge/electric cool-box powered via a 240-volt(AC)-to-12-volt(DC) converter, an low-energy 240-volt fluorescent light bulb and an electric kettle quite happily.
But note that you have to be careful to use a relatively low wattage kettle (1KW maximum) on some sites on the continent because you sometimes encounter a maximum 6-amp hook-up
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