What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 366
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:
How investors can position ahead of the Fed's next policy decision
Boeing shares slide on a disappointing cash flow update. Why this dip is buyable
Stocks making the biggest moves after hours: Visa, Robinhood, NXP, Seagate and more
Grand jury rejects DOJ bid to indict ex-Trump WH aide Cassidy Hutchinson: Reports
To ID.me or not to ID.me?
Neighbour/community simulators?
St. Louis Fed's Musalem: Another rate hike needed 'soon'
Chevron and Exxon hit all-time highs as refining profits soar in reaction to Iran and Ukraine wars
Treasury Department announces new Series I bond rate of 5.51% for the next six months
Movie: Ali G: Who Iz I?