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Does anyone have any experience / advice regarding DIY installation of domestic fire sprinkler systems?

My understanding is a 2.5mm ring main with a 32A mcb and RCD protection can supply 100m2 floor area, and is limited to 66 m cable to comply with the 4% voltage drop rule. I need to supply a wing of a new house which is too far away to manage only 66m cable. I could increase the cable to 4mm...