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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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    I doubt that a transformer suitable for "several computers" will fit into a consumer unit.


    An external transformer will be required but these are available from several suppliers. An RCD on the primary circuit of a isolating transformer will not protect against an electric shock from the secondary side.


    You will need either a special RCD for 110 volts, or possibly a risk assessment that justifies omitting RCD protection in view of the lower and less dangerous voltage. If the transformer has an earthed center tap, then the shock voltage is only 55 volts and in MY VIEW RCD protection could then be omitted for normal dry indoor conditions.
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    I doubt that a transformer suitable for "several computers" will fit into a consumer unit.


    An external transformer will be required but these are available from several suppliers. An RCD on the primary circuit of a isolating transformer will not protect against an electric shock from the secondary side.


    You will need either a special RCD for 110 volts, or possibly a risk assessment that justifies omitting RCD protection in view of the lower and less dangerous voltage. If the transformer has an earthed center tap, then the shock voltage is only 55 volts and in MY VIEW RCD protection could then be omitted for normal dry indoor conditions.
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