When I traveled to London in 2003, I needed to power
four different
electrical devices I was bringing from home, often simultaneously. The
devices all had autoranging or wide-range mains inputs and would run
fine on 220-240V 50Hz, but all had NEMA plugs. I knew there would be
few mains receptacles in my room, and I didn't want to buy a UK outlet
strip and four plug adapters, so I brought a US outlet strip and a
single plug adapter with me.
For anyone that does that, there are two things to be aware of:
1) Check every device you plug into the outlet strip to be certain that
it is rated for 240V.
2) Make sure the outlet strip does NOT contain any surge protection.
Indeed. Most 'surge protection' is simply a VDR rated at a little more
htan mains votlage connected across the mains. Connecting a 110V one
(probably a 130V VDR) to 240V mains is going to blow fuses at least.
I found out later that a friend did something similar on his trip to
Germany, but he took a surge-protected outlet strip. As soon as he
plugged it into the mains, it blew the fuse for the power to an entire
floor of the hotel.
Thati s much less likely to happen in the UK. UK mains plugs contain a
cartridge fuse which is designed to blow before the fuse in the main fuse
box. My experience is that even catastrophic failures (almost dead shorts
across the mains) will blow the plug fuse first.
110V AC supplies are not uncommon in the UK. The reason is that
industrial portable power tools (electric drills, etc) are 110V, and are
run from an isolating transformer with the centre-tap of the (110V)
secondary grounds. The point being that if there's an insulation failure,
the maximum voltage that can appear between some bit of metal and ground
is 55V and a shock from that is unlikely to be fatal.
The transformers are normally in bright yellow plastic boxes (yellow
being the colour associated with 110V on connectors, etc), and are rated
at about 3kVA (there are much larger ones, that's the smallest you'll
easily find). They're not cheap, but an awful lot of hacker-types will
have one.
-tony