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Re: ARC Faults
With the newer ones needed to meet the 2008 NEC, the answer would be 'those fires would be (if arc fault circuit protection was installed) reduced dramatically'.
I would not say 'eliminated', but 'reduced dramatically' would be a definite plus.
Of course, there is the problem of installing AFCIs in old panels, which can be corrected by the exception (which is why the exception is there) to requiring "the entire branch circuit" to be AFCI protected. That exception allows a short run, in metal conduit, to a box where the AFCI protection would be installed, the conductors in that short run are also 'part of that branch circuit', thus those need to be excepted out of 'the entire' branch circuit.
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