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How are they installed?

Are the functions of a fuse and/or an RCD included in an AFCI/AFDD, or are the two forms of protection to be provided separately? I think the article should cover this, briefly. John Stockton (talk) 18:47, 11 September 2016 (BST)

I am guessing they may well do standalone, and a "combined with a MCB" type. Possibly even a combined with a RCBO type, which would probably be the most useful. Schneider do things for the US like this that appear to contain a MCB and the AFDD.

--John Rumm (talk) 01:49, 12 September 2016 (BST)