I have a live/work warehouse space in California. For most of my construction, I've enjoyed the help of a friends father who was a career electrician. He is gone now, and I need a little help.
I have quite a few ceiling boxes and outlets in this place. I'm trying to wire in an outlet in one of my rooms using the junction box that resides in the ceiling. I opened the box expecting a 2-wire set (black/white/ground), or possibly a 3-wire set (there is a light switch nearby that I can't figure out...it might be to the box).
Instead, I found one cable supplying 5 wires: black/black/yellow/yellow/red. No exposed copper for ground, no green.
Not sure if this is a 240v circuit, or something else I don't recognize. Maybe a 3-phase?
Anyone out there know what this might be? Anyone know how/if I can safely install an outlet on here?
Any help would be much appreciated!
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