What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 179
I removed a ceiling light in my apartment only to discover a junction box with wiring I did not expect. Photo here. Left to right: two-strand white wire; four-strand blue wire; single-strand red wire.

This is an old (late 1960s) apartment building in NYC, and I'm all but certain the box dates to that time. The white and red wires were connected to the old lamp. It's the blue wire that I'm confused by. (All wires had wire nuts before I removed them.) I was hoping to see a green grounding wire, but alas.

So, what's up with the blue wire? Do I need to be calling in an electrician here? Thanks for your advice.
Number of Comments
Please click Here to read the full story.
 
Other Top and Latest Questions:
Jim Cramer's top 10 things to watch in the stock market Friday
World's largest sovereign wealth fund's bets on Big Tech and banking drive gains
UK PM Keir Starmer suffers major blow after his party comes third in key vote
UBS turns bullish on Palantir, says buy the dip on this clear AI winner
French old patterns on newspaper print?
Robust Search within recovered data
Movie: 28 Weeks Later
Trump angering MAHA with glyphosate order gives Democrats an opening
Trump Media in talks to spin off Truth Social from DJT into independent stock
This obscure ETF may hold the key to whether the bull market lasts