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A 110V mains supply

Arran Cameron
A video games enthusiast has a number of Japanese computers and games consoles that require a 110V AC mains supply. At the moment they are powered using either individual 230V to 110V stepdown transformers or from shaver sockets but they are power limited to 20VA. It would be more convenient to install 110V wall sockets powered from a fixed stepdown transformer. I have seen 230V to 110V stepdown transformers that are DIN rail mounting so they can be installed in a consumer unit.


Are there any wiring regs concerning a fixed 110V mains supply? Something that I am aware of is that if a stepdown transformer is located in or near to a consumer unit then an RCBO or RCD on the primary side will not trip if there is an current inbalance (electric shock?) on the secondary side. Is there a (legitimate) way of connecting an RCBO to the secondary side?
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    Japanese 100V can be anywhere from about 90 and a bit to a touch under 110, and is often without earth, on plugs with both pins 6mm, an OK if loose fit in the US sockets, and 50 or 60Hz depending on which district.

    The easiest is probably to buy a yellow building site transformer, and wire a Japanese extension lead ( Enchō kōdo ) to  a yellow BS4343 plug, but attach it to a board or table, so not to make it part of the fixed wiring. example of extension lead  https://www.ebay.com/itm/ELECOM-power-strip-lightning-guard-swing-plug-4-ports-2-5m-white-T-K1A-2425WH/173472717532?hash=item2863c79adc:g:xz8AAOSwtMFbc-Bq note the hinged plug - all rated for 15A, but of course the cable is better cooled than ours with it's thicker over jacket.

    Specialist hobby installations like this, as with Ham radio, and the works of the more enthusiastic HiFi types, are not a comfortable fit to the letter of BS7671, and some creativity may be needed, or a temporary installation that the user takes with them when they move out.
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    Japanese 100V can be anywhere from about 90 and a bit to a touch under 110, and is often without earth, on plugs with both pins 6mm, an OK if loose fit in the US sockets, and 50 or 60Hz depending on which district.

    The easiest is probably to buy a yellow building site transformer, and wire a Japanese extension lead ( Enchō kōdo ) to  a yellow BS4343 plug, but attach it to a board or table, so not to make it part of the fixed wiring. example of extension lead  https://www.ebay.com/itm/ELECOM-power-strip-lightning-guard-swing-plug-4-ports-2-5m-white-T-K1A-2425WH/173472717532?hash=item2863c79adc:g:xz8AAOSwtMFbc-Bq note the hinged plug - all rated for 15A, but of course the cable is better cooled than ours with it's thicker over jacket.

    Specialist hobby installations like this, as with Ham radio, and the works of the more enthusiastic HiFi types, are not a comfortable fit to the letter of BS7671, and some creativity may be needed, or a temporary installation that the user takes with them when they move out.
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