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Yes, been watching it coming over the hill! Apparently the available units are a bit clunky at the moment. I suppose there are a lot of big firms who install a huge amount of these before it filters down to the domestic market.
Arcing in Consumer Units is the main cause of electrical fire in the UK so it makes sense they're looking at it. I'm not sure if this is the prime reason for the recommendation.
Airhead
Mr_Sworld
This is why 18th has 'suggested' AFDD's now. The usual one it that IEE suggests you do this in current Regs. Then in the 19th Edition it'll become statuary.