Hmm, interesting read.

Apparently it is now all rooms, not just bedrooms.

I've never heard of them being used at all in domestic installations, I don't think they are used in the UK but I suppose being an old git I am probably out of touch. Maybe it is because our currents are lower than the states for a given power though our total power capability per supply is a lot higher at 100 amp 230 volts.

Do they trip with neon bulbs? That's an arc.