In terms of voltage drop, these figures are derived from the point of supply to the main switchboard. All general-purpose outlets over here are rated @ 10A, if you need to have a larger appliance on a socket-outlet, you can use either a 15A or 20A socket-outlet, but the S/outlet must be fed from a dedicated circuit, and protected appropriately. Only a Range/cooker may be run off a 25 or 32A circuit.
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