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Re: UK 220 volt spec to US 110 volt
He could get lucky. A quick look at the nameplate on the devices will determine if they are designed for dual voltage. Many single phase motors / heaters will have a nameplate that reads: "120/220 50/60Hz" and will have a wiring diagram or point connection schematic that shows how to configure them for each voltage. The difference between 50Hz and 60Hz is negligable for most things. Motors will run very slightly faster. (F=nP/120) Therefore, a 1500rpm motor (at 50Hz) will run at 1800rpm at 60Hz. A 1000rpm motor at 50Hz will run 1200rpm at 60Hz.
As to lighting, if you are very lucky and have LED lighting then it won't matter because it's all being converted to DC anyway. The AC input will have a sticker/nameplate that tells you what the required source must be. For instance, if you look at your laptop power supply, it will probably say "Input: 100-240VAC 50/60Hz" which means you can plug it into anything from 100VAC to 240VAC. The power supply is going to convert it to DC and it is rated to handle the associated current and wattage of anything in that range.
As to lighting, if it is not LED, you can likely get by with CFL bulbs which run at about half the wattage per lumen than incandescents. I hate CFLs too, but in your case you'll get the light you need without doubling the amperage on your wiring.
The point of utmost concern is the size of wiring for each of your devices and circuit breaker size. The circuit breaker is sized to protect the wire, not the load. The wire is sized for the estimated load on the circuit. The device itself is dumb, it will draw whatever it draws regardless of whether or not the wire or CB is sized for it, and that is the danger. That part is up to you to get right.
Last edited by ShoalFinder; 04-02-2013 at 10:52 AM.