My house is old, and much of it has the original knob-and-tube. A prior owner rewired the 'wet' areas (kitchen, bathrooms) with new, grounded, wiring.
Adding GFCi protection to the remaining two-wire circuits would make them safer. Aside from 'things with motors', is there any reason to prefer going plug-by-plug to adding GCFi breakers?
Almost everything we plug in has a two-wire cord. But there are a few exceptions (air cleaners, a microwave that has wandered out of the kitchen, and a laser-printer which has a prior track-record of tripping GFCis, so it needs a proper grounded circuit). What are the considerations here? A GFCi outlet provides a three-wire connection (and a 'no equipment ground' sticker), but is plugging a three-wire plug into it dangerous?