"RBM" wrote in :

Seems logical, but there's no evidence ground was originally used; an
oversight on the installer's part maybe.

No time like the present, to do the right thing.

So, this looks like a case where black vs. white is arbitrary? Common
practice with fluorescent bulbs?

I'm trying to figure out the general wiring concept. The condo was built
around 1970.

J.R.