What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 182
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:
Russia and Ukraine agree local truce to allow repairs at Europe’s largest nuclear power plant
Opinion: Block's layoffs might just be the biggest story of a tumultuous week. Here's why
U.S. and Iran wrap up 'most intense' nuclear talks with no deal — more negotiations ahead
Answered: Can I upload video in q2a by a plugin?
Anthropic faces lose-lose scenario in Pentagon conflict as deadline for policy change looms
OpenAI announces $110 billion funding round with backing from Amazon, Nvidia, SoftBank
South Korea defense stocks soar with heavyweight Hanwha Aerospace surging 25% as traders react to Iran war
Movie: A Useful Ghost
The Pitt: 2:00 P.M.
Movie: Mile End Kicks