What's going on with this junction box?
Post date: 2022-01-24 10:16:34
Views: 178
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:
Gen Z is embracing the prenup, says family law attorney: ‘The taboo of divorces is long gone’
World's largest sovereign wealth fund's bets on Big Tech and banking drive gains
UK PM Keir Starmer suffers major blow after his party comes third in key vote
Pain from sleeping on fractured humerus post-ORIF after new...mattress?
Movie: The Other Me
A Knight of the Seven Kingdoms: The Hedge Knight: The Morrow Show Only
Special Event: MetaFilter Board Town Hall
OpenAI announces $110 billion funding round with backing from Amazon, Nvidia, SoftBank
Netflix ditches deal for Warner Bros. Discovery after Paramount’s offer is deemed superior
Trump said tariffs could someday 'substantially replace' income taxes. What policy experts say