I'm gonna echo John G, wood lathe plaster can be a nightmare. I've had
entire ceilings fall while trying to cut some small holes. Once the keys
break off the lathe, there is no integrity in the stuff at all. Try to work
through attics and basements and definitely whenever possible attach boxes
to studs and disturb the least amount of plaster possible


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I have an old house, complete with plaster+wood lathe walls. The master
bedroom upstairs is fed from an overloaded old circuit that I want to
replace with a new branch circuit.

I see two options; NM and amored cable. The NM option is use all NM
cable for feeds to outlets, and at every stud, remove the plaster,
snake the cable past the stud, and put a nail plate in. This would
obviously require alot of patch work and painting. The BX option is to
use all armored cable by removing the baseboard trim, securing the
cable behind it and go up to each recept. from there.

Because I need to get past a few door frames, using all armored cable
seems to make sense. I have seen this trick in several DIY books.

Is there any issue with this approach?