I was working on a building site on friday, which was using 240v to power all the site instead of 110v. The festoon lights on the site were all homemade with orange or yellow 1.5mm flex, with connector blocks and a bit of cable to a bulb holder. The supply to the site was from a 16A ceeform socket on one of the site huts, to wooden drum with a 16A ceeform socket on, which feed a bit of SY cable which went to a board with a DB with a RCD in, which feed six double sockets.
Here are some pictures
Here are some pictures