What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 173
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:
Star Trek: Starfleet Academy: Ko'Zeine
Can I really not take more than 1 dose of Excedrin Migraine per day?
What’s behind a big jump in January property tech funding
Movie: The Painter and the Thief
Three Silicon Valley engineers charged with stealing Google trade secrets and sending data to Iran
'Canary in the coal mine': Blue Owl liquidity curbs fuel fears about private credit bubble
Trump to decide whether to attack Iran in next 10 days — oil prices rise
Nvidia is in talks to invest up to $30 billion in OpenAI, source says
OpenAI and Anthropic’s rivalry on display as CEOs avoid holding hands at AI summit
These stocks can insulate investors from AI risk — and they pay dividends, says Jenny Harrington