What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 237
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:
The private space race is spurring a luxury hotel land grab for Florida oceanfront property
Analysis: Chairman Kevin Warsh’s task forces are the key to understanding the new Fed
Thursday's big stock stories: What’s likely to move the market in the next trading session
Can you get a loan for a wedding? The do's, don'ts and alternatives
Trump and Iran's President Pezeshkian sign memorandum aimed to end war
auto shop keeps postponing major repair
Separating hobby and work
CEOs of Anthropic and Google DeepMind call for U.S.-led AI coalition in meeting at G7
China to return as major oil buyer in August, JPMorgan says, naming its top stock picks
Amazon AI exec predicts first 'commercially useful' quantum computers in 5-7 years