What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 274
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:
AI Entities Gone Rogue
Imax 70 mm screenings become the biggest star for Christopher Nolan’s ‘The Odyssey’
Samsung Electronics wins $200 billion Broadcom AI chip partnership, boosting foundry push
Does crypto make your portfolio less risky? Only if you do it right, experts say
Maine Democratic delegates choose Troy Jackson as new nominee to face U.S. Sen. Susan Collins
Major quake hits southern Japan, workers missing after mall blast
Meta likely to highlight smart glasses, avoid social media policy on upcoming earnings call, Kalshi traders say
SpaceX stock-purchasing by Congress members fuels conflict concerns
Amazon, Meta and Microsoft face skeptical investors this week after Google report sparked sell-off
EBay, former execs to pay $56 million in blogger harassment and stalking case