One of my guest bedrooms in 1977 home has no ceiling fixture/wiring. I want to add wiring for a ceiling fan.
I know I have 20amp circuit breakers and I know I will have to splice to an existing wire in the attic in a junction box.
In the attic, however, all the existing wires are either round brown/black or flat white.
I'm pretty sure the white wire is 14/2 romex. What would the round brown wires be? (Inside the jacket are just a black, white and ground wire)
From my research, I should only splice like wires together, but its my understanding that with 20 amp circuits, I should be using the yellow 12/2 romex wire. But I am afraid to splice it to the white or black cables in the attic if they aren't the same gauge.
Is there a way I can verify the gauge rating of the cables and just use the same gauge wire to the new fan? Or should I be more concerned that I am potentially using 14/2 wire on a 20 amp circuit?