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Posted by bud-- on May 7, 2008, 12:20 pm
Dave Martindale wrote:
>
> The other problem is that I have a bunch of two-pole 15 A breakers
> protecting Edison-type split circuits, which would have to be replaced
> by two-pole AFCI units - if they even exist.
If they exist, you may have to take out a sub-prime mortgage to afford
them. The requirement is new wiring so existing multiwires shouldn't be
a problem unless you replace the panel. (If you replace the panel I
suspect it is up to the inspector whether you have to protect existing
circuits.)
>
> Besides, I thought AFCIs were primarily for protection against arcs in
> portable wiring - extension cords, portable lamps and appliances, etc.
> Are they now supposed to protect against arcs in permanent wiring too?
I believe the major risk is plug-in stuff. But they are also intended to
protect the supply wiring. The original AFCIs were "Branch/Feeder". The
2008 NEC allows unprotected wiring to an outlet type AFCI using some
some metal-protected wiring to a metal box.
--
bud--
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