Why is mains electricity 240V AC?

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Why is mains electricity 240V AC?
« on: 22/09/2016 13:23:02 »
Don Grunbaum asked the Naked Scientists:
   
Why is the mains electricity supply in the UK 240V AC? Why not, for example 400V DC?

What do you think?
« Last Edit: 22/09/2016 13:23:02 by _system »