If your on about lightswitch . It would be taken from a socket through a 3 amp fcu upto switch then to a socket. Both earth and neutral would be reinstated. I would ask the spark if ge would sign it off . Warrenty i wouldnt bother . If spark wouldnt sign of i would go to building control and register it. Pay there test fees once i get some spare cash
Got a hold of a spark who doesn't do homers but says 4 mm radial would be better for the one side of the room . I emailed him photos of room and proposed route and said its fine. . he said to save money I could buy the stuff and pay a sparky a day rate and get the cu change and wiring done tested and certified. Cost around 200
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