In article , Harry Bloomfield
writes
David explained :
Must remember to test the RCD when hooking up to a caravan site mains.
Usually it is such a relief to find a blue plug that the lead just gets
banged in then the kettle plugged in.

I also do a rough polarity check, though I must admit I have never
found one with an obvious wrong polarity. Make sure that if the EHU
cable is on a reel, that it MUST be run completely off the reel to
prevent it over heating.
Don't know if this was answered but this is from the caravan Club
technical advice pages
"The distribution and supply of electrical power in the UK, as well as
wiring installations in buildings, caravan sites and caravans is
governed by the British Standard BS7671, 2001"
Maybe the regs been updated since then.
--
bert