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Ive made a mains to blue socket of 3 metres, then a 20 metre extension and another 10metre extension before the vac lead. Saves having to unreel 40 metres of lead when i only need 10 for example.
goto an electrical suppliers, ask for 50m of 2.5mm csa sy (the sy is important) rubberised plugtop & socket. the 2.5mm allows pretty much up to 60m probably 70m at a push. if you want to split it into sections then you can use blue industrial plug n sockets as they are ipx5 minimum.
in fact these sums are in tables in the on site guide so no calcs needed